#include <UnsteadyAdvectionDiffusion.h>

Inheritance diagram for Nektar::UnsteadyAdvectionDiffusion:

Public Member Functions
	~UnsteadyAdvectionDiffusion () override=default
	Destructor. More...

void	v_ALEInitObject (int spaceDim, Array< OneD, MultiRegions::ExpListSharedPtr > &fields) override

Public Member Functions inherited from Nektar::UnsteadyAdvection
	~UnsteadyAdvection () override=default
	Destructor. More...

void	v_ALEInitObject (int spaceDim, Array< OneD, MultiRegions::ExpListSharedPtr > &fields) override

Public Member Functions inherited from Nektar::SolverUtils::AdvectionSystem
SOLVER_UTILS_EXPORT	AdvectionSystem (const LibUtilities::SessionReaderSharedPtr &pSession, const SpatialDomains::MeshGraphSharedPtr &pGraph)

SOLVER_UTILS_EXPORT	~AdvectionSystem () override

SOLVER_UTILS_EXPORT void	v_InitObject (bool DeclareField=true) override
	Initialisation object for EquationSystem. More...

SOLVER_UTILS_EXPORT AdvectionSharedPtr	GetAdvObject ()
	Returns the advection object held by this instance. More...

SOLVER_UTILS_EXPORT Array< OneD, NekDouble >	GetElmtCFLVals (const bool FlagAcousticCFL=true)

SOLVER_UTILS_EXPORT NekDouble	GetCFLEstimate (int &elmtid)

Public Member Functions inherited from Nektar::SolverUtils::UnsteadySystem
SOLVER_UTILS_EXPORT	~UnsteadySystem () override
	Destructor. More...

SOLVER_UTILS_EXPORT NekDouble	GetTimeStep (const Array< OneD, const Array< OneD, NekDouble > > &inarray)
	Calculate the larger time-step mantaining the problem stable. More...

SOLVER_UTILS_EXPORT NekDouble	GetTimeStep ()

SOLVER_UTILS_EXPORT void	SetTimeStep (const NekDouble timestep)

SOLVER_UTILS_EXPORT void	SteadyStateResidual (int step, Array< OneD, NekDouble > &L2)

SOLVER_UTILS_EXPORT LibUtilities::TimeIntegrationSchemeSharedPtr &	GetTimeIntegrationScheme ()
	Returns the time integration scheme. More...

SOLVER_UTILS_EXPORT LibUtilities::TimeIntegrationSchemeOperators &	GetTimeIntegrationSchemeOperators ()
	Returns the time integration scheme operators. More...

Public Member Functions inherited from Nektar::SolverUtils::EquationSystem
virtual SOLVER_UTILS_EXPORT	~EquationSystem ()
	Destructor. More...

SOLVER_UTILS_EXPORT void	InitObject (bool DeclareField=true)
	Initialises the members of this object. More...

SOLVER_UTILS_EXPORT void	DoInitialise (bool dumpInitialConditions=true)
	Perform any initialisation necessary before solving the problem. More...

SOLVER_UTILS_EXPORT void	DoSolve ()
	Solve the problem. More...

SOLVER_UTILS_EXPORT void	TransCoeffToPhys ()
	Transform from coefficient to physical space. More...

SOLVER_UTILS_EXPORT void	TransPhysToCoeff ()
	Transform from physical to coefficient space. More...

SOLVER_UTILS_EXPORT void	Output ()
	Perform output operations after solve. More...

SOLVER_UTILS_EXPORT std::string	GetSessionName ()
	Get Session name. More...

template<class T >
std::shared_ptr< T >	as ()

SOLVER_UTILS_EXPORT void	ResetSessionName (std::string newname)
	Reset Session name. More...

SOLVER_UTILS_EXPORT LibUtilities::SessionReaderSharedPtr	GetSession ()
	Get Session name. More...

SOLVER_UTILS_EXPORT MultiRegions::ExpListSharedPtr	GetPressure ()
	Get pressure field if available. More...

SOLVER_UTILS_EXPORT void	ExtraFldOutput (std::vector< Array< OneD, NekDouble > > &fieldcoeffs, std::vector< std::string > &variables)

SOLVER_UTILS_EXPORT void	PrintSummary (std::ostream &out)
	Print a summary of parameters and solver characteristics. More...

SOLVER_UTILS_EXPORT void	SetLambda (NekDouble lambda)
	Set parameter m_lambda. More...

SOLVER_UTILS_EXPORT SessionFunctionSharedPtr	GetFunction (std::string name, const MultiRegions::ExpListSharedPtr &field=MultiRegions::NullExpListSharedPtr, bool cache=false)
	Get a SessionFunction by name. More...

SOLVER_UTILS_EXPORT void	SetInitialConditions (NekDouble initialtime=0.0, bool dumpInitialConditions=true, const int domain=0)
	Initialise the data in the dependent fields. More...

SOLVER_UTILS_EXPORT void	EvaluateExactSolution (int field, Array< OneD, NekDouble > &outfield, const NekDouble time)
	Evaluates an exact solution. More...

SOLVER_UTILS_EXPORT NekDouble	L2Error (unsigned int field, const Array< OneD, NekDouble > &exactsoln, bool Normalised=false)
	Compute the L2 error between fields and a given exact solution. More...

SOLVER_UTILS_EXPORT NekDouble	L2Error (unsigned int field, bool Normalised=false)
	Compute the L2 error of the fields. More...

SOLVER_UTILS_EXPORT NekDouble	LinfError (unsigned int field, const Array< OneD, NekDouble > &exactsoln=NullNekDouble1DArray)
	Linf error computation. More...

SOLVER_UTILS_EXPORT Array< OneD, NekDouble >	ErrorExtraPoints (unsigned int field)
	Compute error (L2 and L_inf) over an larger set of quadrature points return [L2 Linf]. More...

SOLVER_UTILS_EXPORT void	Checkpoint_Output (const int n)
	Write checkpoint file of m_fields. More...

SOLVER_UTILS_EXPORT void	Checkpoint_Output (const int n, MultiRegions::ExpListSharedPtr &field, std::vector< Array< OneD, NekDouble > > &fieldcoeffs, std::vector< std::string > &variables)
	Write checkpoint file of custom data fields. More...

SOLVER_UTILS_EXPORT void	Checkpoint_BaseFlow (const int n)
	Write base flow file of m_fields. More...

SOLVER_UTILS_EXPORT void	WriteFld (const std::string &outname)
	Write field data to the given filename. More...

SOLVER_UTILS_EXPORT void	WriteFld (const std::string &outname, MultiRegions::ExpListSharedPtr &field, std::vector< Array< OneD, NekDouble > > &fieldcoeffs, std::vector< std::string > &variables)
	Write input fields to the given filename. More...

SOLVER_UTILS_EXPORT void	ImportFld (const std::string &infile, Array< OneD, MultiRegions::ExpListSharedPtr > &pFields)
	Input field data from the given file. More...

SOLVER_UTILS_EXPORT void	ImportFldToMultiDomains (const std::string &infile, Array< OneD, MultiRegions::ExpListSharedPtr > &pFields, const int ndomains)
	Input field data from the given file to multiple domains. More...

SOLVER_UTILS_EXPORT void	ImportFld (const std::string &infile, std::vector< std::string > &fieldStr, Array< OneD, Array< OneD, NekDouble > > &coeffs)
	Output a field. Input field data into array from the given file. More...

SOLVER_UTILS_EXPORT void	ImportFld (const std::string &infile, MultiRegions::ExpListSharedPtr &pField, std::string &pFieldName)
	Output a field. Input field data into ExpList from the given file. More...

SOLVER_UTILS_EXPORT void	SessionSummary (SummaryList &vSummary)
	Write out a session summary. More...

SOLVER_UTILS_EXPORT Array< OneD, MultiRegions::ExpListSharedPtr > &	UpdateFields ()

SOLVER_UTILS_EXPORT LibUtilities::FieldMetaDataMap &	UpdateFieldMetaDataMap ()
	Get hold of FieldInfoMap so it can be updated. More...

SOLVER_UTILS_EXPORT NekDouble	GetTime ()
	Return final time. More...

SOLVER_UTILS_EXPORT int	GetNcoeffs ()

SOLVER_UTILS_EXPORT int	GetNcoeffs (const int eid)

SOLVER_UTILS_EXPORT int	GetNumExpModes ()

SOLVER_UTILS_EXPORT const Array< OneD, int >	GetNumExpModesPerExp ()

SOLVER_UTILS_EXPORT int	GetNvariables ()

SOLVER_UTILS_EXPORT const std::string	GetVariable (unsigned int i)

SOLVER_UTILS_EXPORT int	GetTraceTotPoints ()

SOLVER_UTILS_EXPORT int	GetTraceNpoints ()

SOLVER_UTILS_EXPORT int	GetExpSize ()

SOLVER_UTILS_EXPORT int	GetPhys_Offset (int n)

SOLVER_UTILS_EXPORT int	GetCoeff_Offset (int n)

SOLVER_UTILS_EXPORT int	GetTotPoints ()

SOLVER_UTILS_EXPORT int	GetTotPoints (int n)

SOLVER_UTILS_EXPORT int	GetNpoints ()

SOLVER_UTILS_EXPORT int	GetSteps ()

SOLVER_UTILS_EXPORT NekDouble	GetTimeStep ()

SOLVER_UTILS_EXPORT void	CopyFromPhysField (const int i, Array< OneD, NekDouble > &output)

SOLVER_UTILS_EXPORT void	CopyToPhysField (const int i, const Array< OneD, const NekDouble > &input)

SOLVER_UTILS_EXPORT Array< OneD, NekDouble > &	UpdatePhysField (const int i)

SOLVER_UTILS_EXPORT void	SetSteps (const int steps)

SOLVER_UTILS_EXPORT void	ZeroPhysFields ()

SOLVER_UTILS_EXPORT void	FwdTransFields ()

SOLVER_UTILS_EXPORT void	SetModifiedBasis (const bool modbasis)

SOLVER_UTILS_EXPORT int	GetCheckpointNumber ()

SOLVER_UTILS_EXPORT void	SetCheckpointNumber (int num)

SOLVER_UTILS_EXPORT int	GetCheckpointSteps ()

SOLVER_UTILS_EXPORT void	SetCheckpointSteps (int num)

SOLVER_UTILS_EXPORT int	GetInfoSteps ()

SOLVER_UTILS_EXPORT void	SetInfoSteps (int num)

SOLVER_UTILS_EXPORT void	SetIterationNumberPIT (int num)

SOLVER_UTILS_EXPORT void	SetWindowNumberPIT (int num)

SOLVER_UTILS_EXPORT Array< OneD, const Array< OneD, NekDouble > >	GetTraceNormals ()

SOLVER_UTILS_EXPORT void	SetTime (const NekDouble time)

SOLVER_UTILS_EXPORT void	SetTimeStep (const NekDouble timestep)

SOLVER_UTILS_EXPORT void	SetInitialStep (const int step)

SOLVER_UTILS_EXPORT void	SetBoundaryConditions (NekDouble time)
	Evaluates the boundary conditions at the given time. More...

SOLVER_UTILS_EXPORT bool	NegatedOp ()
	Identify if operator is negated in DoSolve. More...

Public Member Functions inherited from Nektar::SolverUtils::ALEHelper
virtual	~ALEHelper ()=default

virtual SOLVER_UTILS_EXPORT void	v_ALEInitObject (int spaceDim, Array< OneD, MultiRegions::ExpListSharedPtr > &fields)

SOLVER_UTILS_EXPORT void	InitObject (int spaceDim, Array< OneD, MultiRegions::ExpListSharedPtr > &fields)

virtual SOLVER_UTILS_EXPORT void	v_UpdateGridVelocity (const NekDouble &time)

virtual SOLVER_UTILS_EXPORT void	v_ALEPreMultiplyMass (Array< OneD, Array< OneD, NekDouble > > &fields)

SOLVER_UTILS_EXPORT void	ALEDoElmtInvMass (Array< OneD, Array< OneD, NekDouble > > &traceNormals, Array< OneD, Array< OneD, NekDouble > > &fields, NekDouble time)
	Update m_fields with u^n by multiplying by inverse mass matrix. That's then used in e.g. checkpoint output and L^2 error calculation. More...

SOLVER_UTILS_EXPORT void	ALEDoElmtInvMassBwdTrans (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray)

SOLVER_UTILS_EXPORT void	MoveMesh (const NekDouble &time, Array< OneD, Array< OneD, NekDouble > > &traceNormals)

const Array< OneD, const Array< OneD, NekDouble > > &	GetGridVelocity ()

SOLVER_UTILS_EXPORT const Array< OneD, const Array< OneD, NekDouble > > &	GetGridVelocityTrace ()

SOLVER_UTILS_EXPORT void	ExtraFldOutputGridVelocity (std::vector< Array< OneD, NekDouble > > &fieldcoeffs, std::vector< std::string > &variables)

Static Public Member Functions
static SolverUtils::EquationSystemSharedPtr	create (const LibUtilities::SessionReaderSharedPtr &pSession, const SpatialDomains::MeshGraphSharedPtr &pGraph)
	Creates an instance of this class. More...

Static Public Member Functions inherited from Nektar::UnsteadyAdvection
static SolverUtils::EquationSystemSharedPtr	create (const LibUtilities::SessionReaderSharedPtr &pSession, const SpatialDomains::MeshGraphSharedPtr &pGraph)
	Creates an instance of this class. More...

Static Public Attributes
static std::string	className
	Name of class. More...

Static Public Attributes inherited from Nektar::UnsteadyAdvection
static std::string	className
	Name of class. More...

Static Public Attributes inherited from Nektar::SolverUtils::UnsteadySystem
static std::string	cmdSetStartTime

static std::string	cmdSetStartChkNum

Protected Member Functions
	UnsteadyAdvectionDiffusion (const LibUtilities::SessionReaderSharedPtr &pSession, const SpatialDomains::MeshGraphSharedPtr &pGraph)
	Session reader. More...

void	GetFluxVectorDiff (const Array< OneD, Array< OneD, NekDouble > > &inarray, const Array< OneD, Array< OneD, Array< OneD, NekDouble > > > &qfield, Array< OneD, Array< OneD, Array< OneD, NekDouble > > > &viscousTensor)
	Evaluate the flux at each solution point for the diffusion part. More...

void	DoOdeRhs (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, const NekDouble time)
	Compute the RHS. More...

void	DoImplicitSolve (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, NekDouble time, NekDouble lambda)
	Solve implicitly the diffusion term. More...

void	v_InitObject (bool DeclareFields=true) override
	Initialise the object. More...

void	v_GenerateSummary (SolverUtils::SummaryList &s) override
	Print Summary. More...

bool	v_PreIntegrate (int step) override
	PreIntegration step for substepping. More...

void	v_ExtraFldOutput (std::vector< Array< OneD, NekDouble > > &fieldcoeffs, std::vector< std::string > &variables) override

void	SubStepAdvance (int nstep, NekDouble time)

NekDouble	GetSubstepTimeStep ()

void	SetUpSubSteppingTimeIntegration (const LibUtilities::TimeIntegrationSchemeSharedPtr &IntegrationScheme)

void	SubStepAdvection (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, const NekDouble time)

void	SubStepProjection (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, const NekDouble time)

void	AddAdvectionPenaltyFlux (const Array< OneD, const Array< OneD, NekDouble > > &velfield, const Array< OneD, const Array< OneD, NekDouble > > &physfield, Array< OneD, Array< OneD, NekDouble > > &Outarray)

Array< OneD, NekDouble >	GetMaxStdVelocity (const Array< OneD, Array< OneD, NekDouble > > inarray)

Protected Member Functions inherited from Nektar::UnsteadyAdvection
	UnsteadyAdvection (const LibUtilities::SessionReaderSharedPtr &pSession, const SpatialDomains::MeshGraphSharedPtr &pGraph)
	Session reader. More...

void	GetFluxVector (const Array< OneD, Array< OneD, NekDouble > > &physfield, Array< OneD, Array< OneD, Array< OneD, NekDouble > > > &flux)
	Evaluate the flux at each solution point. More...

void	GetFluxVectorDeAlias (const Array< OneD, Array< OneD, NekDouble > > &physfield, Array< OneD, Array< OneD, Array< OneD, NekDouble > > > &flux)
	Evaluate the flux at each solution point using dealiasing. More...

void	DoOdeRhs (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, const NekDouble time)
	Compute the RHS. More...

void	DoOdeProjection (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, const NekDouble time)
	Compute the projection. More...

Array< OneD, NekDouble > &	GetNormalVelocity ()
	Get the normal velocity. More...

Array< OneD, NekDouble > &	GetNormalVel (const Array< OneD, const Array< OneD, NekDouble > > &velfield)
	Get the normal velocity based on input velfield. More...

void	v_InitObject (bool DeclareFields=true) override
	Initialise the object. More...

void	v_GenerateSummary (SolverUtils::SummaryList &s) override
	Print Summary. More...

bool	v_PreIntegrate (int step) override

void	v_ExtraFldOutput (std::vector< Array< OneD, NekDouble > > &fieldcoeffs, std::vector< std::string > &variables) override

Protected Member Functions inherited from Nektar::SolverUtils::AdvectionSystem
SOLVER_UTILS_EXPORT bool	v_PostIntegrate (int step) override

virtual SOLVER_UTILS_EXPORT Array< OneD, NekDouble >	v_GetMaxStdVelocity (const NekDouble SpeedSoundFactor=1.0)

Protected Member Functions inherited from Nektar::SolverUtils::UnsteadySystem
SOLVER_UTILS_EXPORT	UnsteadySystem (const LibUtilities::SessionReaderSharedPtr &pSession, const SpatialDomains::MeshGraphSharedPtr &pGraph)
	Initialises UnsteadySystem class members. More...

SOLVER_UTILS_EXPORT void	v_InitObject (bool DeclareField=true) override
	Init object for UnsteadySystem class. More...

SOLVER_UTILS_EXPORT void	v_DoSolve () override
	Solves an unsteady problem. More...

virtual SOLVER_UTILS_EXPORT void	v_PrintStatusInformation (const int step, const NekDouble cpuTime)
	Print Status Information. More...

virtual SOLVER_UTILS_EXPORT void	v_PrintSummaryStatistics (const NekDouble intTime)
	Print Summary Statistics. More...

SOLVER_UTILS_EXPORT void	v_DoInitialise (bool dumpInitialConditions=true) override
	Sets up initial conditions. More...

SOLVER_UTILS_EXPORT void	v_GenerateSummary (SummaryList &s) override
	Print a summary of time stepping parameters. More...

virtual SOLVER_UTILS_EXPORT NekDouble	v_GetTimeStep (const Array< OneD, const Array< OneD, NekDouble > > &inarray)
	Return the timestep to be used for the next step in the time-marching loop. More...

virtual SOLVER_UTILS_EXPORT bool	v_PreIntegrate (int step)

virtual SOLVER_UTILS_EXPORT bool	v_PostIntegrate (int step)

virtual SOLVER_UTILS_EXPORT bool	v_RequireFwdTrans ()

virtual SOLVER_UTILS_EXPORT void	v_SteadyStateResidual (int step, Array< OneD, NekDouble > &L2)

virtual SOLVER_UTILS_EXPORT bool	v_UpdateTimeStepCheck ()

SOLVER_UTILS_EXPORT NekDouble	MaxTimeStepEstimator ()
	Get the maximum timestep estimator for cfl control. More...

SOLVER_UTILS_EXPORT void	CheckForRestartTime (NekDouble &time, int &nchk)

SOLVER_UTILS_EXPORT void	SVVVarDiffCoeff (const Array< OneD, Array< OneD, NekDouble > > vel, StdRegions::VarCoeffMap &varCoeffMap)
	Evaluate the SVV diffusion coefficient according to Moura's paper where it should proportional to h time velocity. More...

SOLVER_UTILS_EXPORT void	DoDummyProjection (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, const NekDouble time)
	Perform dummy projection. More...

Protected Member Functions inherited from Nektar::SolverUtils::EquationSystem
SOLVER_UTILS_EXPORT	EquationSystem (const LibUtilities::SessionReaderSharedPtr &pSession, const SpatialDomains::MeshGraphSharedPtr &pGraph)
	Initialises EquationSystem class members. More...

virtual SOLVER_UTILS_EXPORT void	v_InitObject (bool DeclareFeld=true)
	Initialisation object for EquationSystem. More...

virtual SOLVER_UTILS_EXPORT void	v_DoInitialise (bool dumpInitialConditions=true)
	Virtual function for initialisation implementation. More...

virtual SOLVER_UTILS_EXPORT void	v_DoSolve ()
	Virtual function for solve implementation. More...

virtual SOLVER_UTILS_EXPORT NekDouble	v_LinfError (unsigned int field, const Array< OneD, NekDouble > &exactsoln=NullNekDouble1DArray)
	Virtual function for the L_inf error computation between fields and a given exact solution. More...

virtual SOLVER_UTILS_EXPORT NekDouble	v_L2Error (unsigned int field, const Array< OneD, NekDouble > &exactsoln=NullNekDouble1DArray, bool Normalised=false)
	Virtual function for the L_2 error computation between fields and a given exact solution. More...

virtual SOLVER_UTILS_EXPORT void	v_TransCoeffToPhys ()
	Virtual function for transformation to physical space. More...

virtual SOLVER_UTILS_EXPORT void	v_TransPhysToCoeff ()
	Virtual function for transformation to coefficient space. More...

virtual SOLVER_UTILS_EXPORT void	v_GenerateSummary (SummaryList &l)
	Virtual function for generating summary information. More...

virtual SOLVER_UTILS_EXPORT void	v_SetInitialConditions (NekDouble initialtime=0.0, bool dumpInitialConditions=true, const int domain=0)

virtual SOLVER_UTILS_EXPORT void	v_EvaluateExactSolution (unsigned int field, Array< OneD, NekDouble > &outfield, const NekDouble time)

virtual SOLVER_UTILS_EXPORT void	v_Output (void)

virtual SOLVER_UTILS_EXPORT MultiRegions::ExpListSharedPtr	v_GetPressure (void)

virtual SOLVER_UTILS_EXPORT bool	v_NegatedOp (void)
	Virtual function to identify if operator is negated in DoSolve. More...

virtual SOLVER_UTILS_EXPORT void	v_ExtraFldOutput (std::vector< Array< OneD, NekDouble > > &fieldcoeffs, std::vector< std::string > &variables)

Protected Attributes
bool	m_subSteppingScheme

bool	m_useSpecVanVisc

NekDouble	m_sVVCutoffRatio

NekDouble	m_sVVDiffCoeff

SolverUtils::DiffusionSharedPtr	m_diffusion

LibUtilities::TimeIntegrationSchemeSharedPtr	m_subStepIntegrationScheme

LibUtilities::TimeIntegrationSchemeOperators	m_subStepIntegrationOps

int	m_intSteps

int	m_minsubsteps

Protected Attributes inherited from Nektar::UnsteadyAdvection
bool	m_useGJPStabilisation

NekDouble	m_GJPJumpScale

SolverUtils::RiemannSolverSharedPtr	m_riemannSolver

Array< OneD, Array< OneD, NekDouble > >	m_velocity
	Advection velocity. More...

Array< OneD, NekDouble >	m_traceVn

std::vector< SolverUtils::ForcingSharedPtr >	m_forcing
	Forcing terms. More...

Protected Attributes inherited from Nektar::SolverUtils::AdvectionSystem
SolverUtils::AdvectionSharedPtr	m_advObject
	Advection term. More...

Protected Attributes inherited from Nektar::SolverUtils::UnsteadySystem
LibUtilities::TimeIntegrationSchemeSharedPtr	m_intScheme
	Wrapper to the time integration scheme. More...

LibUtilities::TimeIntegrationSchemeOperators	m_ode
	The time integration scheme operators to use. More...

Array< OneD, Array< OneD, NekDouble > >	m_previousSolution
	Storage for previous solution for steady-state check. More...

std::vector< int >	m_intVariables

NekDouble	m_cflSafetyFactor
	CFL safety factor (comprise between 0 to 1). More...

NekDouble	m_CFLGrowth
	CFL growth rate. More...

NekDouble	m_CFLEnd
	Maximun cfl in cfl growth. More...

int	m_abortSteps
	Number of steps between checks for abort conditions. More...

bool	m_explicitDiffusion
	Indicates if explicit or implicit treatment of diffusion is used. More...

bool	m_explicitAdvection
	Indicates if explicit or implicit treatment of advection is used. More...

bool	m_explicitReaction
	Indicates if explicit or implicit treatment of reaction is used. More...

int	m_steadyStateSteps
	Check for steady state at step interval. More...

NekDouble	m_steadyStateTol
	Tolerance to which steady state should be evaluated at. More...

int	m_filtersInfosteps
	Number of time steps between outputting filters information. More...

std::vector< std::pair< std::string, FilterSharedPtr > >	m_filters

bool	m_homoInitialFwd
	Flag to determine if simulation should start in homogeneous forward transformed state. More...

std::ofstream	m_errFile

NekDouble	m_epsilon
	Diffusion coefficient. More...

Protected Attributes inherited from Nektar::SolverUtils::EquationSystem
LibUtilities::CommSharedPtr	m_comm
	Communicator. More...

bool	m_verbose

LibUtilities::SessionReaderSharedPtr	m_session
	The session reader. More...

std::map< std::string, SolverUtils::SessionFunctionSharedPtr >	m_sessionFunctions
	Map of known SessionFunctions. More...

LibUtilities::FieldIOSharedPtr	m_fld
	Field input/output. More...

Array< OneD, MultiRegions::ExpListSharedPtr >	m_fields
	Array holding all dependent variables. More...

SpatialDomains::BoundaryConditionsSharedPtr	m_boundaryConditions
	Pointer to boundary conditions object. More...

SpatialDomains::MeshGraphSharedPtr	m_graph
	Pointer to graph defining mesh. More...

std::string	m_sessionName
	Name of the session. More...

NekDouble	m_time
	Current time of simulation. More...

int	m_initialStep
	Number of the step where the simulation should begin. More...

NekDouble	m_fintime
	Finish time of the simulation. More...

NekDouble	m_timestep
	Time step size. More...

NekDouble	m_lambda
	Lambda constant in real system if one required. More...

NekDouble	m_checktime
	Time between checkpoints. More...

NekDouble	m_lastCheckTime

NekDouble	m_TimeIncrementFactor

int	m_nchk
	Number of checkpoints written so far. More...

int	m_steps
	Number of steps to take. More...

int	m_checksteps
	Number of steps between checkpoints. More...

int	m_infosteps
	Number of time steps between outputting status information. More...

int	m_iterPIT = 0
	Number of parallel-in-time time iteration. More...

int	m_windowPIT = 0
	Index of windows for parallel-in-time time iteration. More...

int	m_spacedim
	Spatial dimension (>= expansion dim). More...

int	m_expdim
	Expansion dimension. More...

bool	m_singleMode
	Flag to determine if single homogeneous mode is used. More...

bool	m_halfMode
	Flag to determine if half homogeneous mode is used. More...

bool	m_multipleModes
	Flag to determine if use multiple homogenenous modes are used. More...

bool	m_useFFT
	Flag to determine if FFT is used for homogeneous transform. More...

bool	m_homogen_dealiasing
	Flag to determine if dealiasing is used for homogeneous simulations. More...

bool	m_specHP_dealiasing
	Flag to determine if dealisising is usde for the Spectral/hp element discretisation. More...

enum MultiRegions::ProjectionType	m_projectionType
	Type of projection; e.g continuous or discontinuous. More...

Array< OneD, Array< OneD, NekDouble > >	m_traceNormals
	Array holding trace normals for DG simulations in the forwards direction. More...

Array< OneD, bool >	m_checkIfSystemSingular
	Flag to indicate if the fields should be checked for singularity. More...

LibUtilities::FieldMetaDataMap	m_fieldMetaDataMap
	Map to identify relevant solver info to dump in output fields. More...

Array< OneD, NekDouble >	m_movingFrameData
	Moving reference frame status in the inertial frame X, Y, Z, Theta_x, Theta_y, Theta_z, U, V, W, Omega_x, Omega_y, Omega_z, A_x, A_y, A_z, DOmega_x, DOmega_y, DOmega_z, pivot_x, pivot_y, pivot_z. More...

std::vector< std::string >	m_strFrameData
	variable name in m_movingFrameData More...

int	m_NumQuadPointsError
	Number of Quadrature points used to work out the error. More...

enum HomogeneousType	m_HomogeneousType

NekDouble	m_LhomX
	physical length in X direction (if homogeneous) More...

NekDouble	m_LhomY
	physical length in Y direction (if homogeneous) More...

NekDouble	m_LhomZ
	physical length in Z direction (if homogeneous) More...

int	m_npointsX
	number of points in X direction (if homogeneous) More...

int	m_npointsY
	number of points in Y direction (if homogeneous) More...

int	m_npointsZ
	number of points in Z direction (if homogeneous) More...

int	m_HomoDirec
	number of homogenous directions More...

Protected Attributes inherited from Nektar::SolverUtils::ALEHelper
Array< OneD, MultiRegions::ExpListSharedPtr >	m_fieldsALE

Array< OneD, Array< OneD, NekDouble > >	m_gridVelocity

Array< OneD, Array< OneD, NekDouble > >	m_gridVelocityTrace

std::vector< ALEBaseShPtr >	m_ALEs

bool	m_ALESolver = false

bool	m_ImplicitALESolver = false

NekDouble	m_prevStageTime = 0.0

int	m_spaceDim

Private Attributes
NekDouble	m_epsilon

Friends
class	MemoryManager< UnsteadyAdvectionDiffusion >

Additional Inherited Members
Protected Types inherited from Nektar::SolverUtils::EquationSystem
enum	HomogeneousType { eHomogeneous1D , eHomogeneous2D , eHomogeneous3D , eNotHomogeneous }
	Parameter for homogeneous expansions. More...

Static Protected Attributes inherited from Nektar::SolverUtils::EquationSystem
static std::string	equationSystemTypeLookupIds []

static std::string	projectionTypeLookupIds []

Detailed Description

Definition at line 43 of file UnsteadyAdvectionDiffusion.h.

Constructor & Destructor Documentation

◆ ~UnsteadyAdvectionDiffusion()

Nektar::UnsteadyAdvectionDiffusion::~UnsteadyAdvectionDiffusion ( )

overridedefault

Destructor.

◆ UnsteadyAdvectionDiffusion()

Nektar::UnsteadyAdvectionDiffusion::UnsteadyAdvectionDiffusion	(	const LibUtilities::SessionReaderSharedPtr &	pSession,
		const SpatialDomains::MeshGraphSharedPtr &	pGraph
	)

protected

Session reader.

Definition at line 48 of file UnsteadyAdvectionDiffusion.cpp.

    : UnsteadySystem(pSession, pGraph), UnsteadyAdvection(pSession, pGraph)
{
}

Member Function Documentation

◆ AddAdvectionPenaltyFlux()

void Nektar::UnsteadyAdvectionDiffusion::AddAdvectionPenaltyFlux	(	const Array< OneD, const Array< OneD, NekDouble > > &	velfield,
		const Array< OneD, const Array< OneD, NekDouble > > &	physfield,
		Array< OneD, Array< OneD, NekDouble > > &	Outarray
	)

protected

Number of trace points

Forward state array

Backward state array

upwind numerical flux state array

Normal velocity array

Extract forwards/backwards trace spaces Note: Needs to have correct i value to get boundary conditions

Upwind between elements

Construct difference between numflux and Fwd,Bwd

Calculate the numerical fluxes multipling Fwd, Bwd and numflux by the normal advection velocity

Definition at line 514 of file UnsteadyAdvectionDiffusion.cpp.

{
    ASSERTL1(physfield.size() == Outarray.size(),
             "Physfield and outarray are of different dimensions");
 
    int i;
 
    /// Number of trace points
    int nTracePts = m_fields[0]->GetTrace()->GetNpoints();
 
    /// Forward state array
    Array<OneD, NekDouble> Fwd(3 * nTracePts);
 
    /// Backward state array
    Array<OneD, NekDouble> Bwd = Fwd + nTracePts;
 
    /// upwind numerical flux state array
    Array<OneD, NekDouble> numflux = Bwd + nTracePts;
 
    /// Normal velocity array
    Array<OneD, NekDouble> Vn = GetNormalVel(velfield);
 
    for (i = 0; i < physfield.size(); ++i)
    {
        /// Extract forwards/backwards trace spaces
        /// Note: Needs to have correct i value to get boundary conditions
        m_fields[i]->GetFwdBwdTracePhys(physfield[i], Fwd, Bwd);
 
        /// Upwind between elements
        m_fields[0]->GetTrace()->Upwind(Vn, Fwd, Bwd, numflux);
 
        /// Construct difference between numflux and Fwd,Bwd
        Vmath::Vsub(nTracePts, numflux, 1, Fwd, 1, Fwd, 1);
        Vmath::Vsub(nTracePts, numflux, 1, Bwd, 1, Bwd, 1);
 
        /// Calculate the numerical fluxes multipling Fwd, Bwd and
        /// numflux by the normal advection velocity
        Vmath::Vmul(nTracePts, Fwd, 1, Vn, 1, Fwd, 1);
        Vmath::Vmul(nTracePts, Bwd, 1, Vn, 1, Bwd, 1);
 
        m_fields[0]->AddFwdBwdTraceIntegral(Fwd, Bwd, Outarray[i]);
    }
}

References ASSERTL1, Nektar::UnsteadyAdvection::GetNormalVel(), Nektar::SolverUtils::EquationSystem::m_fields, Vmath::Vmul(), and Vmath::Vsub().

Referenced by SubStepAdvection().

◆ create()

static SolverUtils::EquationSystemSharedPtr Nektar::UnsteadyAdvectionDiffusion::create	(	const LibUtilities::SessionReaderSharedPtr &	pSession,
		const SpatialDomains::MeshGraphSharedPtr &	pGraph
	)

inlinestatic

Creates an instance of this class.

Definition at line 49 of file UnsteadyAdvectionDiffusion.h.

    {
        SolverUtils::EquationSystemSharedPtr p =
            MemoryManager<UnsteadyAdvectionDiffusion>::AllocateSharedPtr(
                pSession, pGraph);
        p->InitObject();
        return p;
    }

References Nektar::MemoryManager< DataType >::AllocateSharedPtr(), and CellMLToNektar.cellml_metadata::p.

◆ DoImplicitSolve()

void Nektar::UnsteadyAdvectionDiffusion::DoImplicitSolve	(	const Array< OneD, const Array< OneD, NekDouble > > &	inarray,
		Array< OneD, Array< OneD, NekDouble > > &	outarray,
		NekDouble	time,
		NekDouble	lambda
	)

protected

Solve implicitly the diffusion term.

Definition at line 209 of file UnsteadyAdvectionDiffusion.cpp.

{
    int nvariables = inarray.size();
    int nq         = m_fields[0]->GetNpoints();
 
    StdRegions::ConstFactorMap factors;
    factors[StdRegions::eFactorLambda] = 1.0 / lambda / m_epsilon;
 
    // Add factor is GJP turned on
    if (m_useGJPStabilisation)
    {
        factors[StdRegions::eFactorGJP] = m_GJPJumpScale / m_epsilon;
    }
 
    if (m_useSpecVanVisc)
    {
        factors[StdRegions::eFactorSVVCutoffRatio] = m_sVVCutoffRatio;
        factors[StdRegions::eFactorSVVDiffCoeff]   = m_sVVDiffCoeff / m_epsilon;
    }
 
    if (m_projectionType == MultiRegions::eDiscontinuous)
    {
        factors[StdRegions::eFactorTau] = 1.0;
    }
 
    Array<OneD, Array<OneD, NekDouble>> F(nvariables);
    for (int n = 0; n < nvariables; ++n)
    {
        F[n] = Array<OneD, NekDouble>(nq);
    }
 
    // We solve ( \nabla^2 - HHlambda ) Y[i] = rhs [i]
    // inarray = input: \hat{rhs} -> output: \hat{Y}
    // outarray = output: nabla^2 \hat{Y}
    // where \hat = modal coeffs
    for (int i = 0; i < nvariables; ++i)
    {
        // Multiply 1.0/timestep/lambda
        Vmath::Smul(nq, -factors[StdRegions::eFactorLambda], inarray[i], 1,
                    F[i], 1);
    }
 
    // Setting boundary conditions
    SetBoundaryConditions(time);
 
    for (int i = 0; i < nvariables; ++i)
    {
        // Solve a system of equations with Helmholtz solver
        m_fields[i]->HelmSolve(F[i], m_fields[i]->UpdateCoeffs(), factors);
 
        m_fields[i]->BwdTrans(m_fields[i]->GetCoeffs(), outarray[i]);
    }
}

References Nektar::MultiRegions::eDiscontinuous, Nektar::StdRegions::eFactorGJP, Nektar::StdRegions::eFactorLambda, Nektar::StdRegions::eFactorSVVCutoffRatio, Nektar::StdRegions::eFactorSVVDiffCoeff, Nektar::StdRegions::eFactorTau, Nektar::VarcoeffHashingTest::factors, m_epsilon, Nektar::SolverUtils::EquationSystem::m_fields, Nektar::UnsteadyAdvection::m_GJPJumpScale, Nektar::SolverUtils::EquationSystem::m_projectionType, m_sVVCutoffRatio, m_sVVDiffCoeff, Nektar::UnsteadyAdvection::m_useGJPStabilisation, m_useSpecVanVisc, Nektar::SolverUtils::EquationSystem::SetBoundaryConditions(), and Vmath::Smul().

Referenced by v_InitObject().

◆ DoOdeRhs()

void Nektar::UnsteadyAdvectionDiffusion::DoOdeRhs	(	const Array< OneD, const Array< OneD, NekDouble > > &	inarray,
		Array< OneD, Array< OneD, NekDouble > > &	outarray,
		const NekDouble	time
	)

protected

Compute the RHS.

Compute the right-hand side for the unsteady linear advection diffusion problem.

Parameters

inarray	Given fields.
outarray	Calculated solution.
time	Time.

Definition at line 164 of file UnsteadyAdvectionDiffusion.cpp.

{
    // Number of fields (variables of the problem)
    int nVariables = inarray.size();
 
    UnsteadyAdvection::DoOdeRhs(inarray, outarray, time);
 
    if (m_explicitDiffusion)
    {
        Array<OneD, Array<OneD, NekDouble>> outarrayDiff(nVariables);
        for (int i = 0; i < nVariables; ++i)
        {
            outarrayDiff[i] = Array<OneD, NekDouble>(outarray[i].size(), 0.0);
        }
 
        if (m_ALESolver)
        {
            Array<OneD, Array<OneD, NekDouble>> tmpIn(nVariables);
            // If ALE we must take Mu coefficient space to u physical space
            ALEHelper::ALEDoElmtInvMassBwdTrans(inarray, tmpIn);
            m_diffusion->DiffuseCoeffs(nVariables, m_fields, tmpIn,
                                       outarrayDiff); // Using tmpIn from above
        }
        else
        {
            m_diffusion->Diffuse(nVariables, m_fields, inarray, outarrayDiff);
        }
 
        for (int i = 0; i < nVariables; ++i)
        {
            Vmath::Vadd(outarray[i].size(), &outarrayDiff[i][0], 1,
                        &outarray[i][0], 1, &outarray[i][0], 1);
        }
    }
}

References Nektar::SolverUtils::ALEHelper::ALEDoElmtInvMassBwdTrans(), Nektar::UnsteadyAdvection::DoOdeRhs(), Nektar::SolverUtils::ALEHelper::m_ALESolver, m_diffusion, Nektar::SolverUtils::UnsteadySystem::m_explicitDiffusion, Nektar::SolverUtils::EquationSystem::m_fields, and Vmath::Vadd().

Referenced by v_InitObject().

◆ GetFluxVectorDiff()

void Nektar::UnsteadyAdvectionDiffusion::GetFluxVectorDiff	(	const Array< OneD, Array< OneD, NekDouble > > &	inarray,
		const Array< OneD, Array< OneD, Array< OneD, NekDouble > > > &	qfield,
		Array< OneD, Array< OneD, Array< OneD, NekDouble > > > &	viscousTensor
	)

protected

Evaluate the flux at each solution point for the diffusion part.

Return the flux vector for the diffusion part.

Definition at line 270 of file UnsteadyAdvectionDiffusion.cpp.

{
    unsigned int nDim              = qfield.size();
    unsigned int nConvectiveFields = qfield[0].size();
    unsigned int nPts              = qfield[0][0].size();
    for (unsigned int j = 0; j < nDim; ++j)
    {
        for (unsigned int i = 0; i < nConvectiveFields; ++i)
        {
            Vmath::Smul(nPts, m_epsilon, qfield[j][i], 1, viscousTensor[j][i],
                        1);
        }
    }
}

References m_epsilon, and Vmath::Smul().

Referenced by v_InitObject().

◆ GetMaxStdVelocity()

Array< OneD, NekDouble > Nektar::UnsteadyAdvectionDiffusion::GetMaxStdVelocity ( const Array< OneD, Array< OneD, NekDouble > > inarray )

protected

Definition at line 561 of file UnsteadyAdvectionDiffusion.cpp.

{
 
    int n_points_0 = m_fields[0]->GetExp(0)->GetTotPoints();
    int n_element  = m_fields[0]->GetExpSize();
    int nvel       = inarray.size();
    int cnt;
 
    ASSERTL0(nvel >= 2, "Method not implemented for 1D");
 
    NekDouble pntVelocity;
 
    // Getting the standard velocity vector on the 2D normal space
    Array<OneD, Array<OneD, NekDouble>> stdVelocity(nvel);
    Array<OneD, NekDouble> maxV(n_element, 0.0);
    LibUtilities::PointsKeyVector ptsKeys;
 
    for (int i = 0; i < nvel; ++i)
    {
        stdVelocity[i] = Array<OneD, NekDouble>(n_points_0);
    }
 
    if (nvel == 2)
    {
        cnt = 0.0;
        for (int el = 0; el < n_element; ++el)
        {
            int n_points = m_fields[0]->GetExp(el)->GetTotPoints();
            ptsKeys      = m_fields[0]->GetExp(el)->GetPointsKeys();
 
            // reset local space if necessary
            if (n_points != n_points_0)
            {
                for (int j = 0; j < nvel; ++j)
                {
                    stdVelocity[j] = Array<OneD, NekDouble>(n_points);
                }
                n_points_0 = n_points;
            }
 
            Array<TwoD, const NekDouble> gmat = m_fields[0]
                                                    ->GetExp(el)
                                                    ->GetGeom()
                                                    ->GetMetricInfo()
                                                    ->GetDerivFactors(ptsKeys);
 
            if (m_fields[0]
                    ->GetExp(el)
                    ->GetGeom()
                    ->GetMetricInfo()
                    ->GetGtype() == SpatialDomains::eDeformed)
            {
                for (int i = 0; i < n_points; i++)
                {
                    stdVelocity[0][i] = gmat[0][i] * inarray[0][i + cnt] +
                                        gmat[2][i] * inarray[1][i + cnt];
 
                    stdVelocity[1][i] = gmat[1][i] * inarray[0][i + cnt] +
                                        gmat[3][i] * inarray[1][i + cnt];
                }
            }
            else
            {
                for (int i = 0; i < n_points; i++)
                {
                    stdVelocity[0][i] = gmat[0][0] * inarray[0][i + cnt] +
                                        gmat[2][0] * inarray[1][i + cnt];
 
                    stdVelocity[1][i] = gmat[1][0] * inarray[0][i + cnt] +
                                        gmat[3][0] * inarray[1][i + cnt];
                }
            }
 
            cnt += n_points;
 
            for (int i = 0; i < n_points; i++)
            {
                pntVelocity = stdVelocity[0][i] * stdVelocity[0][i] +
                              stdVelocity[1][i] * stdVelocity[1][i];
 
                if (pntVelocity > maxV[el])
                {
                    maxV[el] = pntVelocity;
                }
            }
            maxV[el] = sqrt(maxV[el]);
        }
    }
    else
    {
        cnt = 0;
        for (int el = 0; el < n_element; ++el)
        {
 
            int n_points = m_fields[0]->GetExp(el)->GetTotPoints();
            ptsKeys      = m_fields[0]->GetExp(el)->GetPointsKeys();
 
            // reset local space if necessary
            if (n_points != n_points_0)
            {
                for (int j = 0; j < nvel; ++j)
                {
                    stdVelocity[j] = Array<OneD, NekDouble>(n_points);
                }
                n_points_0 = n_points;
            }
 
            Array<TwoD, const NekDouble> gmat = m_fields[0]
                                                    ->GetExp(el)
                                                    ->GetGeom()
                                                    ->GetMetricInfo()
                                                    ->GetDerivFactors(ptsKeys);
 
            if (m_fields[0]
                    ->GetExp(el)
                    ->GetGeom()
                    ->GetMetricInfo()
                    ->GetGtype() == SpatialDomains::eDeformed)
            {
                for (int i = 0; i < n_points; i++)
                {
                    stdVelocity[0][i] = gmat[0][i] * inarray[0][i + cnt] +
                                        gmat[3][i] * inarray[1][i + cnt] +
                                        gmat[6][i] * inarray[2][i + cnt];
 
                    stdVelocity[1][i] = gmat[1][i] * inarray[0][i + cnt] +
                                        gmat[4][i] * inarray[1][i + cnt] +
                                        gmat[7][i] * inarray[2][i + cnt];
 
                    stdVelocity[2][i] = gmat[2][i] * inarray[0][i + cnt] +
                                        gmat[5][i] * inarray[1][i + cnt] +
                                        gmat[8][i] * inarray[2][i + cnt];
                }
            }
            else
            {
                for (int i = 0; i < n_points; i++)
                {
                    stdVelocity[0][i] = gmat[0][0] * inarray[0][i + cnt] +
                                        gmat[3][0] * inarray[1][i + cnt] +
                                        gmat[6][0] * inarray[2][i + cnt];
 
                    stdVelocity[1][i] = gmat[1][0] * inarray[0][i + cnt] +
                                        gmat[4][0] * inarray[1][i + cnt] +
                                        gmat[7][0] * inarray[2][i + cnt];
 
                    stdVelocity[2][i] = gmat[2][0] * inarray[0][i + cnt] +
                                        gmat[5][0] * inarray[1][i + cnt] +
                                        gmat[8][0] * inarray[2][i + cnt];
                }
            }
 
            cnt += n_points;
 
            for (int i = 0; i < n_points; i++)
            {
                pntVelocity = stdVelocity[0][i] * stdVelocity[0][i] +
                              stdVelocity[1][i] * stdVelocity[1][i] +
                              stdVelocity[2][i] * stdVelocity[2][i];
 
                if (pntVelocity > maxV[el])
                {
                    maxV[el] = pntVelocity;
                }
            }
 
            maxV[el] = sqrt(maxV[el]);
        }
    }
 
    return maxV;
}

References ASSERTL0, Nektar::SpatialDomains::eDeformed, Nektar::SolverUtils::EquationSystem::m_fields, and tinysimd::sqrt().

Referenced by GetSubstepTimeStep().

◆ GetSubstepTimeStep()

NekDouble Nektar::UnsteadyAdvectionDiffusion::GetSubstepTimeStep ( )

protected

Definition at line 385 of file UnsteadyAdvectionDiffusion.cpp.

{
    int n_element = m_fields[0]->GetExpSize();
 
    const Array<OneD, int> ExpOrder = m_fields[0]->EvalBasisNumModesMaxPerExp();
    Array<OneD, int> ExpOrderList(n_element, ExpOrder);
 
    const NekDouble cLambda = 0.2; // Spencer book pag. 317
 
    Array<OneD, NekDouble> tstep(n_element, 0.0);
    Array<OneD, NekDouble> stdVelocity(n_element, 0.0);
 
    stdVelocity = GetMaxStdVelocity(m_velocity);
 
    for (int el = 0; el < n_element; ++el)
    {
        tstep[el] =
            m_cflSafetyFactor / (stdVelocity[el] * cLambda *
                                 (ExpOrder[el] - 1) * (ExpOrder[el] - 1));
    }
 
    NekDouble TimeStep = Vmath::Vmin(n_element, tstep, 1);
    m_session->GetComm()->AllReduce(TimeStep, LibUtilities::ReduceMin);
 
    return TimeStep;
}

References GetMaxStdVelocity(), Nektar::SolverUtils::UnsteadySystem::m_cflSafetyFactor, Nektar::SolverUtils::EquationSystem::m_fields, Nektar::SolverUtils::EquationSystem::m_session, Nektar::UnsteadyAdvection::m_velocity, Nektar::LibUtilities::ReduceMin, and Vmath::Vmin().

Referenced by SubStepAdvance().

◆ SetUpSubSteppingTimeIntegration()

void Nektar::UnsteadyAdvectionDiffusion::SetUpSubSteppingTimeIntegration ( const LibUtilities::TimeIntegrationSchemeSharedPtr & IntegrationScheme )

protected

Definition at line 412 of file UnsteadyAdvectionDiffusion.cpp.

{
    // Set to 1 for first step and it will then be increased in
    // time advance routines
    unsigned int order = IntegrationScheme->GetOrder();
 
    // Set to 1 for first step and it will then be increased in
    // time advance routines
    if ((IntegrationScheme->GetName() == "Euler" &&
         IntegrationScheme->GetVariant() == "Backward") ||
        (IntegrationScheme->GetName() == "BDFImplicit" &&
         (order == 1 || order == 2)))
    {
        // Note RK first order SSP is just Forward Euler.
        m_subStepIntegrationScheme =
            LibUtilities::GetTimeIntegrationSchemeFactory().CreateInstance(
                "RungeKutta", "SSP", order, std::vector<NekDouble>());
    }
    else
    {
        NEKERROR(ErrorUtil::efatal,
                 "Integration method not suitable: "
                 "Options include BackwardEuler or BDFImplicitOrder1");
    }
 
    m_intSteps = IntegrationScheme->GetNumIntegrationPhases();
 
    // set explicit time-integration class operators
    m_subStepIntegrationOps.DefineOdeRhs(
        &UnsteadyAdvectionDiffusion::SubStepAdvection, this);
    m_subStepIntegrationOps.DefineProjection(
        &UnsteadyAdvectionDiffusion::SubStepProjection, this);
}

References Nektar::LibUtilities::NekFactory< tKey, tBase, tParam >::CreateInstance(), Nektar::LibUtilities::TimeIntegrationSchemeOperators::DefineOdeRhs(), Nektar::LibUtilities::TimeIntegrationSchemeOperators::DefineProjection(), Nektar::ErrorUtil::efatal, Nektar::LibUtilities::GetTimeIntegrationSchemeFactory(), m_intSteps, m_subStepIntegrationOps, m_subStepIntegrationScheme, NEKERROR, SubStepAdvection(), and SubStepProjection().

Referenced by v_InitObject().

◆ SubStepAdvance()

void Nektar::UnsteadyAdvectionDiffusion::SubStepAdvance	(	int	nstep,
		NekDouble	time
	)

protected

Definition at line 329 of file UnsteadyAdvectionDiffusion.cpp.

{
    int nsubsteps;
 
    NekDouble dt;
 
    Array<OneD, Array<OneD, NekDouble>> fields, velfields;
 
    static int ncalls = 1;
    int nint          = std::min(ncalls++, m_intSteps);
 
    Array<OneD, NekDouble> CFL(m_fields[0]->GetExpSize(), m_cflSafetyFactor);
 
    LibUtilities::CommSharedPtr comm = m_session->GetComm();
 
    // Get the proper time step with CFL control
    dt = GetSubstepTimeStep();
 
    nsubsteps = (m_timestep > dt) ? ((int)(m_timestep / dt) + 1) : 1;
    nsubsteps = std::max(m_minsubsteps, nsubsteps);
 
    dt = m_timestep / nsubsteps;
 
    if (m_infosteps && !((nstep + 1) % m_infosteps) && comm->GetRank() == 0)
    {
        std::cout << "Sub-integrating using " << nsubsteps
                  << " steps over Dt = " << m_timestep
                  << " (SubStep CFL=" << m_cflSafetyFactor << ")" << std::endl;
    }
 
    const TripleArray &solutionVector = m_intScheme->GetSolutionVector();
 
    for (int m = 0; m < nint; ++m)
    {
        // We need to update the fields held by the m_intScheme
        fields = solutionVector[m];
 
        // Initialise NS solver which is set up to use a GLM method
        // with calls to EvaluateAdvection_SetPressureBCs and
        // SolveUnsteadyStokesSystem
        m_subStepIntegrationScheme->InitializeScheme(dt, fields, time,
                                                     m_subStepIntegrationOps);
 
        for (int n = 0; n < nsubsteps; ++n)
        {
            fields = m_subStepIntegrationScheme->TimeIntegrate(n, dt);
        }
 
        // Reset time integrated solution in m_intScheme
        m_intScheme->SetSolutionVector(m, fields);
    }
}

References Nektar::SolverUtils::EquationSystem::GetExpSize(), GetSubstepTimeStep(), Nektar::SolverUtils::UnsteadySystem::m_cflSafetyFactor, Nektar::SolverUtils::EquationSystem::m_fields, Nektar::SolverUtils::EquationSystem::m_infosteps, Nektar::SolverUtils::UnsteadySystem::m_intScheme, m_intSteps, m_minsubsteps, Nektar::SolverUtils::EquationSystem::m_session, m_subStepIntegrationOps, m_subStepIntegrationScheme, and Nektar::SolverUtils::EquationSystem::m_timestep.

Referenced by v_PreIntegrate().

◆ SubStepAdvection()

void Nektar::UnsteadyAdvectionDiffusion::SubStepAdvection	(	const Array< OneD, const Array< OneD, NekDouble > > &	inarray,
		Array< OneD, Array< OneD, NekDouble > > &	outarray,
		const NekDouble	time
	)

protected

Explicit Advection terms used by SubStepAdvance time integration

Get the number of coefficients

Define an auxiliary variable to compute the RHS

Operations to compute the RHS

Multiply the flux by the inverse of the mass matrix

Store in outarray the physical values of the RHS

Definition at line 450 of file UnsteadyAdvectionDiffusion.cpp.

{
    int i;
    int nVariables = inarray.size();
 
    /// Get the number of coefficients
    int ncoeffs = m_fields[0]->GetNcoeffs();
 
    /// Define an auxiliary variable to compute the RHS
    Array<OneD, Array<OneD, NekDouble>> WeakAdv(nVariables);
    WeakAdv[0] = Array<OneD, NekDouble>(ncoeffs * nVariables);
    for (i = 1; i < nVariables; ++i)
    {
        WeakAdv[i] = WeakAdv[i - 1] + ncoeffs;
    }
 
    // Currently assume velocity field is time independent and does not
    // therefore need extrapolating. RHS computation using the advection base
    // class
    m_advObject->Advect(nVariables, m_fields, m_velocity, inarray, outarray,
                        time);
 
    for (i = 0; i < nVariables; ++i)
    {
        m_fields[i]->IProductWRTBase(outarray[i], WeakAdv[i]);
        // negation requried due to sign of DoAdvection term to be consistent
        Vmath::Neg(ncoeffs, WeakAdv[i], 1);
    }
 
    AddAdvectionPenaltyFlux(m_velocity, inarray, WeakAdv);
 
    /// Operations to compute the RHS
    for (i = 0; i < nVariables; ++i)
    {
        // Negate the RHS
        Vmath::Neg(ncoeffs, WeakAdv[i], 1);
 
        /// Multiply the flux by the inverse of the mass matrix
        m_fields[i]->MultiplyByElmtInvMass(WeakAdv[i], WeakAdv[i]);
 
        /// Store in outarray the physical values of the RHS
        m_fields[i]->BwdTrans(WeakAdv[i], outarray[i]);
    }
}

References AddAdvectionPenaltyFlux(), Nektar::SolverUtils::AdvectionSystem::m_advObject, Nektar::SolverUtils::EquationSystem::m_fields, Nektar::UnsteadyAdvection::m_velocity, and Vmath::Neg().

Referenced by SetUpSubSteppingTimeIntegration().

◆ SubStepProjection()

void Nektar::UnsteadyAdvectionDiffusion::SubStepProjection	(	const Array< OneD, const Array< OneD, NekDouble > > &	inarray,
		Array< OneD, Array< OneD, NekDouble > > &	outarray,
		const NekDouble	time
	)

protected

Projection used by SubStepAdvance time integration

Definition at line 500 of file UnsteadyAdvectionDiffusion.cpp.

{
    ASSERTL1(inarray.size() == outarray.size(),
             "Inarray and outarray of different sizes ");
 
    for (int i = 0; i < inarray.size(); ++i)
    {
        Vmath::Vcopy(inarray[i].size(), inarray[i], 1, outarray[i], 1);
    }
}

References ASSERTL1, and Vmath::Vcopy().

Referenced by SetUpSubSteppingTimeIntegration().

◆ v_ALEInitObject()

void Nektar::UnsteadyAdvectionDiffusion::v_ALEInitObject	(	int	spaceDim,
		Array< OneD, MultiRegions::ExpListSharedPtr > &	fields
	)

overridevirtual

Reimplemented from Nektar::UnsteadyAdvection.

Definition at line 735 of file UnsteadyAdvectionDiffusion.cpp.

{
    if (m_projectionType == MultiRegions::eDiscontinuous)
    {
        m_spaceDim  = spaceDim;
        m_fieldsALE = fields;
 
        // Initialise grid velocities as 0s
        m_gridVelocity      = Array<OneD, Array<OneD, NekDouble>>(m_spaceDim);
        m_gridVelocityTrace = Array<OneD, Array<OneD, NekDouble>>(m_spaceDim);
        for (int i = 0; i < spaceDim; ++i)
        {
            m_gridVelocity[i] =
                Array<OneD, NekDouble>(fields[0]->GetTotPoints(), 0.0);
            m_gridVelocityTrace[i] = Array<OneD, NekDouble>(
                fields[0]->GetTrace()->GetTotPoints(), 0.0);
        }
    }
    ALEHelper::InitObject(spaceDim, fields);
}

References Nektar::MultiRegions::eDiscontinuous, Nektar::SolverUtils::EquationSystem::GetTotPoints(), Nektar::SolverUtils::ALEHelper::InitObject(), Nektar::SolverUtils::ALEHelper::m_fieldsALE, Nektar::SolverUtils::ALEHelper::m_gridVelocity, Nektar::SolverUtils::ALEHelper::m_gridVelocityTrace, Nektar::SolverUtils::EquationSystem::m_projectionType, and Nektar::SolverUtils::ALEHelper::m_spaceDim.

◆ v_ExtraFldOutput()

void Nektar::UnsteadyAdvectionDiffusion::v_ExtraFldOutput	(	std::vector< Array< OneD, NekDouble > > &	fieldcoeffs,
		std::vector< std::string > &	variables
	)

overrideprotectedvirtual

Reimplemented from Nektar::UnsteadyAdvection.

Definition at line 300 of file UnsteadyAdvectionDiffusion.cpp.

{
    bool extraFields;
    m_session->MatchSolverInfo("OutputExtraFields", "True", extraFields, true);
 
    if (extraFields && m_ALESolver)
    {
        ExtraFldOutputGridVelocity(fieldcoeffs, variables);
    }
}

References Nektar::SolverUtils::ALEHelper::ExtraFldOutputGridVelocity(), Nektar::SolverUtils::ALEHelper::m_ALESolver, and Nektar::SolverUtils::EquationSystem::m_session.

◆ v_GenerateSummary()

void Nektar::UnsteadyAdvectionDiffusion::v_GenerateSummary ( SolverUtils::SummaryList & s )

overrideprotectedvirtual

Print Summary.

Reimplemented from Nektar::UnsteadyAdvection.

Definition at line 288 of file UnsteadyAdvectionDiffusion.cpp.

{
    UnsteadyAdvection::v_GenerateSummary(s);
    if (m_useSpecVanVisc)
    {
        std::stringstream ss;
        ss << "SVV (cut off = " << m_sVVCutoffRatio
           << ", coeff = " << m_sVVDiffCoeff << ")";
        SolverUtils::AddSummaryItem(s, "Smoothing", ss.str());
    }
}

References Nektar::SolverUtils::AddSummaryItem(), m_sVVCutoffRatio, m_sVVDiffCoeff, m_useSpecVanVisc, and Nektar::UnsteadyAdvection::v_GenerateSummary().

◆ v_InitObject()

void Nektar::UnsteadyAdvectionDiffusion::v_InitObject ( bool DeclareFields = true )

overrideprotectedvirtual

Initialise the object.

Initialisation object for the unsteady linear advection diffusion equation.

Reimplemented from Nektar::UnsteadyAdvection.

Definition at line 59 of file UnsteadyAdvectionDiffusion.cpp.

{
    UnsteadyAdvection::v_InitObject(DeclareFields);
 
    m_session->LoadParameter("epsilon", m_epsilon, 1.0);
 
    m_session->MatchSolverInfo("SpectralVanishingViscosity", "True",
                               m_useSpecVanVisc, false);
    if (m_useSpecVanVisc)
    {
        m_session->LoadParameter("SVVCutoffRatio", m_sVVCutoffRatio, 0.75);
        m_session->LoadParameter("SVVDiffCoeff", m_sVVDiffCoeff, 0.1);
    }
 
    // turn on substepping
    m_session->MatchSolverInfo("Extrapolation", "SubStepping",
                               m_subSteppingScheme, false);
 
    m_session->LoadParameter("MinSubSteps", m_minsubsteps, 1);
 
    // Type of advection and diffusion classes to be used
    switch (m_projectionType)
    {
        // Discontinuous field
        case MultiRegions::eDiscontinuous:
        {
            // Diffusion term
            if (m_explicitDiffusion)
            {
                std::string diffName;
                m_session->LoadSolverInfo("DiffusionType", diffName, "LDG");
                m_diffusion = SolverUtils::GetDiffusionFactory().CreateInstance(
                    diffName, diffName);
                m_diffusion->SetFluxVector(
                    &UnsteadyAdvectionDiffusion::GetFluxVectorDiff, this);
                m_diffusion->InitObject(m_session, m_fields);
            }
 
            ASSERTL0(m_subSteppingScheme == false,
                     "SubSteppingScheme is not set up for DG projection");
            break;
        }
        // Continuous field
        case MultiRegions::eGalerkin:
        case MultiRegions::eMixed_CG_Discontinuous:
        {
            // Advection term
            std::string advName;
            m_session->LoadSolverInfo("AdvectionType", advName,
                                      "NonConservative");
            if (advName.compare("WeakDG") == 0)
            {
                // Define the normal velocity fields
                if (m_fields[0]->GetTrace())
                {
                    m_traceVn = Array<OneD, NekDouble>(GetTraceNpoints());
                }
 
                std::string riemName;
                m_session->LoadSolverInfo("UpwindType", riemName, "Upwind");
                m_riemannSolver =
                    SolverUtils::GetRiemannSolverFactory().CreateInstance(
                        riemName, m_session);
                m_riemannSolver->SetScalar(
                    "Vn", &UnsteadyAdvectionDiffusion::GetNormalVelocity, this);
                m_advObject->SetRiemannSolver(m_riemannSolver);
                m_advObject->InitObject(m_session, m_fields);
            }
 
            // In case of Galerkin explicit diffusion gives an error
            if (m_explicitDiffusion)
            {
                ASSERTL0(false, "Explicit Galerkin diffusion not set up.");
            }
            // In case of Galerkin implicit diffusion: do nothing
            break;
        }
        default:
        {
            ASSERTL0(false, "Unsupported projection type.");
            break;
        }
    }
 
    m_ode.DefineImplicitSolve(&UnsteadyAdvectionDiffusion::DoImplicitSolve,
                              this);
    m_ode.DefineOdeRhs(&UnsteadyAdvectionDiffusion::DoOdeRhs, this);
 
    if (m_subSteppingScheme) // Substepping
    {
        ASSERTL0(m_projectionType == MultiRegions::eMixed_CG_Discontinuous,
                 "Projection must be set to Mixed_CG_Discontinuous for "
                 "substepping");
        SetUpSubSteppingTimeIntegration(m_intScheme);
    }
}

◆ v_PreIntegrate()

bool Nektar::UnsteadyAdvectionDiffusion::v_PreIntegrate ( int step )

overrideprotectedvirtual

PreIntegration step for substepping.

Perform the extrapolation.

Reimplemented from Nektar::UnsteadyAdvection.

Definition at line 316 of file UnsteadyAdvectionDiffusion.cpp.

{
    if (m_subSteppingScheme)
    {
        SubStepAdvance(step, m_time);
    }
 
    return false;
}

References m_subSteppingScheme, Nektar::SolverUtils::EquationSystem::m_time, and SubStepAdvance().

Friends And Related Function Documentation

◆ MemoryManager< UnsteadyAdvectionDiffusion >

friend class MemoryManager< UnsteadyAdvectionDiffusion >

friend

Definition at line 1 of file UnsteadyAdvectionDiffusion.h.

Member Data Documentation

◆ className

std::string Nektar::UnsteadyAdvectionDiffusion::className

static

Initial value:

=
    SolverUtils::GetEquationSystemFactory().RegisterCreatorFunction(
        "UnsteadyAdvectionDiffusion", UnsteadyAdvectionDiffusion::create,
        "Unsteady Advection-Diffusion equation")