Nektar::UnsteadyDiffusion Class Reference

#include <UnsteadyDiffusion.h>

Inheritance diagram for Nektar::UnsteadyDiffusion:

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

Static Public Attributes
static std::string	className
	Name of class.
Static Public Attributes inherited from Nektar::SolverUtils::UnsteadySystem
static std::string	cmdSetStartTime
static std::string	cmdSetStartChkNum

Protected Member Functions
	UnsteadyDiffusion (const LibUtilities::SessionReaderSharedPtr &pSession, const SpatialDomains::MeshGraphSharedPtr &pGraph)
	~UnsteadyDiffusion () override=default
void	v_InitObject (bool DeclareFields=true) override
	Initialisation object for the unsteady diffusion problem.
void	DoOdeRhs (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, const NekDouble time)
void	DoOdeProjection (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, const NekDouble time)
	Compute the projection for the unsteady diffusion problem.
void	DoImplicitSolve (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, NekDouble time, NekDouble lambda)
	Implicit solution of the unsteady diffusion problem.
void	GetFluxVector (const Array< OneD, Array< OneD, NekDouble > > &inarray, const Array< OneD, Array< OneD, Array< OneD, NekDouble > > > &qfield, Array< OneD, Array< OneD, Array< OneD, NekDouble > > > &viscousTensor)
	Return the flux vector for the unsteady diffusion problem.
void	v_GenerateSummary (SummaryList &s) override
	Virtual function for generating summary information.
Protected Member Functions inherited from Nektar::SolverUtils::UnsteadySystem
SOLVER_UTILS_EXPORT	UnsteadySystem (const LibUtilities::SessionReaderSharedPtr &pSession, const SpatialDomains::MeshGraphSharedPtr &pGraph)
	Initialises UnsteadySystem class members.
SOLVER_UTILS_EXPORT void	v_InitObject (bool DeclareField=true) override
	Init object for UnsteadySystem class.
SOLVER_UTILS_EXPORT void	v_DoSolve () override
	Solves an unsteady problem.
virtual SOLVER_UTILS_EXPORT void	v_PrintStatusInformation (const int step, const NekDouble cpuTime)
	Print Status Information.
virtual SOLVER_UTILS_EXPORT void	v_PrintSummaryStatistics (const NekDouble intTime)
	Print Summary Statistics.
SOLVER_UTILS_EXPORT void	v_DoInitialise (bool dumpInitialConditions=true) override
	Sets up initial conditions.
SOLVER_UTILS_EXPORT void	v_GenerateSummary (SummaryList &s) override
	Print a summary of time stepping parameters.
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.
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.
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.
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.
Protected Member Functions inherited from Nektar::SolverUtils::EquationSystem
SOLVER_UTILS_EXPORT	EquationSystem (const LibUtilities::SessionReaderSharedPtr &pSession, const SpatialDomains::MeshGraphSharedPtr &pGraph)
	Initialises EquationSystem class members.
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.
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.
virtual SOLVER_UTILS_EXPORT NekDouble	v_H1Error (unsigned int field, const Array< OneD, NekDouble > &exactsoln=NullNekDouble1DArray, bool Normalised=false)
	Virtual function for the H_1 error computation between fields and a given exact solution.
virtual SOLVER_UTILS_EXPORT void	v_TransCoeffToPhys ()
	Virtual function for transformation to physical space.
virtual SOLVER_UTILS_EXPORT void	v_TransPhysToCoeff ()
	Virtual function for transformation to coefficient space.
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.
virtual SOLVER_UTILS_EXPORT void	v_ExtraFldOutput (std::vector< Array< OneD, NekDouble > > &fieldcoeffs, std::vector< std::string > &variables)

Protected Attributes
NekDouble	m_epsilon
NekDouble	m_d00 = 1.0
NekDouble	m_d11 = 1.0
NekDouble	m_d22 = 1.0
bool	m_useSpecVanVisc
NekDouble	m_sVVCutoffRatio
NekDouble	m_sVVDiffCoeff
StdRegions::VarCoeffMap	m_varcoeff
SolverUtils::DiffusionSharedPtr	m_diffusion
SolverUtils::RiemannSolverSharedPtr	m_riemannSolver
Protected Attributes inherited from Nektar::SolverUtils::UnsteadySystem
LibUtilities::TimeIntegrationSchemeSharedPtr	m_intScheme
	Wrapper to the time integration scheme.
LibUtilities::TimeIntegrationSchemeOperators	m_ode
	The time integration scheme operators to use.
Array< OneD, Array< OneD, NekDouble > >	m_previousSolution
	Storage for previous solution for steady-state check.
std::vector< int >	m_intVariables
NekDouble	m_cflSafetyFactor
	CFL safety factor (comprise between 0 to 1).
NekDouble	m_CFLGrowth
	CFL growth rate.
NekDouble	m_CFLEnd
	Maximun cfl in cfl growth.
int	m_abortSteps
	Number of steps between checks for abort conditions.
bool	m_explicitDiffusion
	Indicates if explicit or implicit treatment of diffusion is used.
bool	m_explicitAdvection
	Indicates if explicit or implicit treatment of advection is used.
bool	m_explicitReaction
	Indicates if explicit or implicit treatment of reaction is used.
int	m_steadyStateSteps
	Check for steady state at step interval.
NekDouble	m_steadyStateTol
	Tolerance to which steady state should be evaluated at.
int	m_filtersInfosteps
	Number of time steps between outputting filters information.
std::vector< std::pair< std::string, FilterSharedPtr > >	m_filters
bool	m_homoInitialFwd
	Flag to determine if simulation should start in homogeneous forward transformed state.
std::ofstream	m_errFile
NekDouble	m_epsilon
	Diffusion coefficient.
Protected Attributes inherited from Nektar::SolverUtils::EquationSystem
LibUtilities::CommSharedPtr	m_comm
	Communicator.
bool	m_verbose
LibUtilities::SessionReaderSharedPtr	m_session
	The session reader.
std::map< std::string, SolverUtils::SessionFunctionSharedPtr >	m_sessionFunctions
	Map of known SessionFunctions.
LibUtilities::FieldIOSharedPtr	m_fld
	Field input/output.
Array< OneD, MultiRegions::ExpListSharedPtr >	m_fields
	Array holding all dependent variables.
SpatialDomains::BoundaryConditionsSharedPtr	m_boundaryConditions
	Pointer to boundary conditions object.
SpatialDomains::MeshGraphSharedPtr	m_graph
	Pointer to graph defining mesh.
std::string	m_sessionName
	Name of the session.
NekDouble	m_time
	Current time of simulation.
int	m_initialStep
	Number of the step where the simulation should begin.
NekDouble	m_fintime
	Finish time of the simulation.
NekDouble	m_timestep
	Time step size.
NekDouble	m_lambda
	Lambda constant in real system if one required.
NekDouble	m_checktime
	Time between checkpoints.
NekDouble	m_lastCheckTime
NekDouble	m_TimeIncrementFactor
int	m_nchk
	Number of checkpoints written so far.
int	m_steps
	Number of steps to take.
int	m_checksteps
	Number of steps between checkpoints.
int	m_infosteps
	Number of time steps between outputting status information.
int	m_iterPIT = 0
	Number of parallel-in-time time iteration.
int	m_windowPIT = 0
	Index of windows for parallel-in-time time iteration.
int	m_spacedim
	Spatial dimension (>= expansion dim).
int	m_expdim
	Expansion dimension.
bool	m_singleMode
	Flag to determine if single homogeneous mode is used.
bool	m_halfMode
	Flag to determine if half homogeneous mode is used.
bool	m_multipleModes
	Flag to determine if use multiple homogenenous modes are used.
bool	m_useFFT
	Flag to determine if FFT is used for homogeneous transform.
bool	m_homogen_dealiasing
	Flag to determine if dealiasing is used for homogeneous simulations.
bool	m_specHP_dealiasing
	Flag to determine if dealisising is usde for the Spectral/hp element discretisation.
enum MultiRegions::ProjectionType	m_projectionType
	Type of projection; e.g continuous or discontinuous.
Array< OneD, Array< OneD, NekDouble > >	m_traceNormals
	Array holding trace normals for DG simulations in the forwards direction.
Array< OneD, bool >	m_checkIfSystemSingular
	Flag to indicate if the fields should be checked for singularity.
LibUtilities::FieldMetaDataMap	m_fieldMetaDataMap
	Map to identify relevant solver info to dump in output fields.
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.
std::vector< std::string >	m_strFrameData
	variable name in m_movingFrameData
int	m_NumQuadPointsError
	Number of Quadrature points used to work out the error.
enum HomogeneousType	m_HomogeneousType
NekDouble	m_LhomX
	physical length in X direction (if homogeneous)
NekDouble	m_LhomY
	physical length in Y direction (if homogeneous)
NekDouble	m_LhomZ
	physical length in Z direction (if homogeneous)
int	m_npointsX
	number of points in X direction (if homogeneous)
int	m_npointsY
	number of points in Y direction (if homogeneous)
int	m_npointsZ
	number of points in Z direction (if homogeneous)
int	m_HomoDirec
	number of homogenous directions
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_meshDistorted = false
bool	m_implicitALESolver = false
bool	m_updateNormals = false
NekDouble	m_prevStageTime = 0.0
int	m_spaceDim

Friends
class	MemoryManager< UnsteadyDiffusion >

Additional Inherited Members
Public Member Functions inherited from Nektar::SolverUtils::UnsteadySystem
SOLVER_UTILS_EXPORT	~UnsteadySystem () override=default
	Destructor.
SOLVER_UTILS_EXPORT NekDouble	GetTimeStep (const Array< OneD, const Array< OneD, NekDouble > > &inarray)
	Calculate the larger time-step mantaining the problem stable.
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.
SOLVER_UTILS_EXPORT LibUtilities::TimeIntegrationSchemeOperators &	GetTimeIntegrationSchemeOperators ()
	Returns the time integration scheme operators.
Public Member Functions inherited from Nektar::SolverUtils::EquationSystem
virtual SOLVER_UTILS_EXPORT	~EquationSystem ()
	Destructor.
SOLVER_UTILS_EXPORT void	InitObject (bool DeclareField=true)
	Initialises the members of this object.
SOLVER_UTILS_EXPORT void	DoInitialise (bool dumpInitialConditions=true)
	Perform any initialisation necessary before solving the problem.
SOLVER_UTILS_EXPORT void	DoSolve ()
	Solve the problem.
SOLVER_UTILS_EXPORT void	TransCoeffToPhys ()
	Transform from coefficient to physical space.
SOLVER_UTILS_EXPORT void	TransPhysToCoeff ()
	Transform from physical to coefficient space.
SOLVER_UTILS_EXPORT void	Output ()
	Perform output operations after solve.
SOLVER_UTILS_EXPORT std::string	GetSessionName ()
	Get Session name.
template<class T >
std::shared_ptr< T >	as ()
SOLVER_UTILS_EXPORT void	ResetSessionName (std::string newname)
	Reset Session name.
SOLVER_UTILS_EXPORT LibUtilities::SessionReaderSharedPtr	GetSession ()
	Get Session name.
SOLVER_UTILS_EXPORT MultiRegions::ExpListSharedPtr	GetPressure ()
	Get pressure field if available.
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.
SOLVER_UTILS_EXPORT void	SetLambda (NekDouble lambda)
	Set parameter m_lambda.
SOLVER_UTILS_EXPORT SessionFunctionSharedPtr	GetFunction (std::string name, const MultiRegions::ExpListSharedPtr &field=MultiRegions::NullExpListSharedPtr, bool cache=false)
	Get a SessionFunction by name.
SOLVER_UTILS_EXPORT void	SetInitialConditions (NekDouble initialtime=0.0, bool dumpInitialConditions=true, const int domain=0)
	Initialise the data in the dependent fields.
SOLVER_UTILS_EXPORT void	EvaluateExactSolution (int field, Array< OneD, NekDouble > &outfield, const NekDouble time)
	Evaluates an exact solution.
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.
SOLVER_UTILS_EXPORT NekDouble	L2Error (unsigned int field, bool Normalised=false)
	Compute the L2 error of the fields.
SOLVER_UTILS_EXPORT NekDouble	LinfError (unsigned int field, const Array< OneD, NekDouble > &exactsoln=NullNekDouble1DArray)
	Linf error computation.
SOLVER_UTILS_EXPORT NekDouble	H1Error (unsigned int field, const Array< OneD, NekDouble > &exactsoln, bool Normalised=false)
	Compute the H1 error between fields and a given exact solution.
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].
SOLVER_UTILS_EXPORT void	Checkpoint_Output (const int n)
	Write checkpoint file of m_fields.
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.
SOLVER_UTILS_EXPORT void	Checkpoint_BaseFlow (const int n)
	Write base flow file of m_fields.
SOLVER_UTILS_EXPORT void	WriteFld (const std::string &outname)
	Write field data to the given filename.
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.
SOLVER_UTILS_EXPORT void	ImportFld (const std::string &infile, Array< OneD, MultiRegions::ExpListSharedPtr > &pFields)
	Input field data from the given file.
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.
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.
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.
SOLVER_UTILS_EXPORT void	SessionSummary (SummaryList &vSummary)
	Write out a session summary.
SOLVER_UTILS_EXPORT Array< OneD, MultiRegions::ExpListSharedPtr > &	UpdateFields ()
SOLVER_UTILS_EXPORT LibUtilities::FieldMetaDataMap &	UpdateFieldMetaDataMap ()
	Get hold of FieldInfoMap so it can be updated.
SOLVER_UTILS_EXPORT NekDouble	GetTime ()
	Return final time.
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 void	SetSteps (const int steps)
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	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.
SOLVER_UTILS_EXPORT bool	NegatedOp ()
	Identify if operator is negated in DoSolve.
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.
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)
SOLVER_UTILS_EXPORT void	ResetMatricesNormal (Array< OneD, Array< OneD, NekDouble > > &traceNormals)
SOLVER_UTILS_EXPORT void	UpdateNormalsFlag ()
const Array< OneD, const Array< OneD, NekDouble > > &	GetGridVelocity ()
bool &	GetUpdateNormalsFlag ()
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)
SOLVER_UTILS_EXPORT void	ExtraFldOutputGrid (std::vector< Array< OneD, NekDouble > > &fieldcoeffs, std::vector< std::string > &variables)
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 46 of file UnsteadyDiffusion.h.

Constructor & Destructor Documentation

UnsteadyDiffusion()

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

protected

Definition at line 44 of file UnsteadyDiffusion.cpp.

    : UnsteadySystem(pSession, pGraph)
{
}

~UnsteadyDiffusion()

Nektar::UnsteadyDiffusion::~UnsteadyDiffusion ( )

overrideprotecteddefault

Member Function Documentation

create()

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

inlinestatic

Creates an instance of this class.

Definition at line 52 of file UnsteadyDiffusion.h.

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

References Nektar::MemoryManager< DataType >::AllocateSharedPtr().

DoImplicitSolve()

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

protected

Implicit solution of the unsteady diffusion problem.

Definition at line 200 of file UnsteadyDiffusion.cpp.

{
    StdRegions::ConstFactorMap factors;
 
    int nvariables                     = inarray.size();
    int npoints                        = m_fields[0]->GetNpoints();
    factors[StdRegions::eFactorLambda] = 1.0 / lambda / m_epsilon;
    factors[StdRegions::eFactorTau]    = 1.0;
 
    if (m_useSpecVanVisc)
    {
        factors[StdRegions::eFactorSVVCutoffRatio] = m_sVVCutoffRatio;
        factors[StdRegions::eFactorSVVDiffCoeff]   = m_sVVDiffCoeff / m_epsilon;
    }
 
    // 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(npoints, -factors[StdRegions::eFactorLambda], inarray[i], 1,
                    outarray[i], 1);
 
        // Solve a system of equations with Helmholtz solver
        m_fields[i]->HelmSolve(outarray[i], m_fields[i]->UpdateCoeffs(),
                               factors, m_varcoeff);
 
        m_fields[i]->BwdTrans(m_fields[i]->GetCoeffs(), outarray[i]);
 
        m_fields[i]->SetPhysState(false);
    }
}

References Nektar::StdRegions::eFactorLambda, Nektar::StdRegions::eFactorSVVCutoffRatio, Nektar::StdRegions::eFactorSVVDiffCoeff, Nektar::StdRegions::eFactorTau, m_epsilon, Nektar::SolverUtils::EquationSystem::m_fields, m_sVVCutoffRatio, m_sVVDiffCoeff, m_useSpecVanVisc, m_varcoeff, and Vmath::Smul().

Referenced by v_InitObject().

DoOdeProjection()

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

protected

Compute the projection for the unsteady diffusion problem.

Parameters

inarray	Given fields.
outarray	Calculated solution.
time	Time.

Definition at line 154 of file UnsteadyDiffusion.cpp.

{
    int i;
    int nvariables = inarray.size();
    SetBoundaryConditions(time);
 
    switch (m_projectionType)
    {
        case MultiRegions::eDiscontinuous:
        {
            // Just copy over array
            if (inarray != outarray)
            {
                int npoints = GetNpoints();
 
                for (i = 0; i < nvariables; ++i)
                {
                    Vmath::Vcopy(npoints, inarray[i], 1, outarray[i], 1);
                }
            }
            break;
        }
        case MultiRegions::eGalerkin:
        {
            Array<OneD, NekDouble> coeffs(m_fields[0]->GetNcoeffs());
 
            for (i = 0; i < nvariables; ++i)
            {
                m_fields[i]->FwdTrans(inarray[i], coeffs);
                m_fields[i]->BwdTrans(coeffs, outarray[i]);
            }
            break;
        }
        default:
        {
            ASSERTL0(false, "Unknown projection scheme");
            break;
        }
    }
}

References ASSERTL0, Nektar::MultiRegions::eDiscontinuous, Nektar::MultiRegions::eGalerkin, Nektar::SolverUtils::EquationSystem::GetNcoeffs(), Nektar::SolverUtils::EquationSystem::GetNpoints(), Nektar::SolverUtils::EquationSystem::m_fields, Nektar::SolverUtils::EquationSystem::m_projectionType, Nektar::SolverUtils::EquationSystem::SetBoundaryConditions(), and Vmath::Vcopy().

Referenced by v_InitObject().

DoOdeRhs()

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

protected

Definition at line 135 of file UnsteadyDiffusion.cpp.

{
    // Number of fields (variables of the problem)
    int nVariables = inarray.size();
 
    // RHS computation using the new diffusion base class
    m_diffusion->Diffuse(nVariables, m_fields, inarray, outarray);
}

References m_diffusion, and Nektar::SolverUtils::EquationSystem::m_fields.

Referenced by Nektar::UnsteadyReactionDiffusion::DoOdeRhs(), and v_InitObject().

GetFluxVector()

void Nektar::UnsteadyDiffusion::GetFluxVector ( 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

Return the flux vector for the unsteady diffusion problem.

Definition at line 241 of file UnsteadyDiffusion.cpp.

{
    unsigned int nDim              = qfield.size();
    unsigned int nConvectiveFields = qfield[0].size();
    unsigned int nPts              = qfield[0][0].size();
 
    NekDouble d[3] = {m_d00, m_d11, m_d22};
 
    for (unsigned int j = 0; j < nDim; ++j)
    {
        for (unsigned int i = 0; i < nConvectiveFields; ++i)
        {
            Vmath::Smul(nPts, m_epsilon * d[j], qfield[j][i], 1,
                        viscousTensor[j][i], 1);
        }
    }
}

References m_d00, m_d11, m_d22, m_epsilon, and Vmath::Smul().

Referenced by v_InitObject().

v_GenerateSummary()

void Nektar::UnsteadyDiffusion::v_GenerateSummary ( SummaryList &  l )

overrideprotectedvirtual

Virtual function for generating summary information.

Reimplemented from Nektar::SolverUtils::EquationSystem.

Definition at line 262 of file UnsteadyDiffusion.cpp.

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

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

v_InitObject()

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

overrideprotectedvirtual

Initialisation object for the unsteady diffusion problem.

Reimplemented from Nektar::SolverUtils::EquationSystem.

Reimplemented in Nektar::UnsteadyReactionDiffusion.

Definition at line 54 of file UnsteadyDiffusion.cpp.

{
    UnsteadySystem::v_InitObject(DeclareFields);
 
    // Load diffusion parameter
    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);
    }
 
    int npoints = m_fields[0]->GetNpoints();
 
    if (m_session->DefinesParameter("d00"))
    {
        m_d00 = m_session->GetParameter("d00");
        m_varcoeff[StdRegions::eVarCoeffD00] =
            Array<OneD, NekDouble>(npoints, m_session->GetParameter("d00"));
    }
    if (m_session->DefinesParameter("d11"))
    {
        m_d11 = m_session->GetParameter("d11");
        m_varcoeff[StdRegions::eVarCoeffD11] =
            Array<OneD, NekDouble>(npoints, m_session->GetParameter("d11"));
    }
    if (m_session->DefinesParameter("d22"))
    {
        m_d22 = m_session->GetParameter("d22");
        m_varcoeff[StdRegions::eVarCoeffD22] =
            Array<OneD, NekDouble>(npoints, m_session->GetParameter("d22"));
    }
 
    switch (m_projectionType)
    {
        case MultiRegions::eDiscontinuous:
        {
            std::string diffName;
 
            // Do not forwards transform initial condition
            m_homoInitialFwd = false;
 
            m_session->LoadSolverInfo("DiffusionType", diffName, "LDG");
            m_diffusion = SolverUtils::GetDiffusionFactory().CreateInstance(
                diffName, diffName);
            m_diffusion->SetFluxVector(&UnsteadyDiffusion::GetFluxVector, this);
            m_diffusion->InitObject(m_session, m_fields);
            break;
        }
        case MultiRegions::eGalerkin:
        {
            // 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, "Unknown projection scheme");
            break;
        }
    }
 
    m_ode.DefineOdeRhs(&UnsteadyDiffusion::DoOdeRhs, this);
    m_ode.DefineProjection(&UnsteadyDiffusion::DoOdeProjection, this);
    m_ode.DefineImplicitSolve(&UnsteadyDiffusion::DoImplicitSolve, this);
}

References ASSERTL0, Nektar::LibUtilities::NekFactory< tKey, tBase, tParam >::CreateInstance(), Nektar::LibUtilities::TimeIntegrationSchemeOperators::DefineImplicitSolve(), Nektar::LibUtilities::TimeIntegrationSchemeOperators::DefineOdeRhs(), Nektar::LibUtilities::TimeIntegrationSchemeOperators::DefineProjection(), DoImplicitSolve(), DoOdeProjection(), DoOdeRhs(), Nektar::MultiRegions::eDiscontinuous, Nektar::MultiRegions::eGalerkin, Nektar::StdRegions::eVarCoeffD00, Nektar::StdRegions::eVarCoeffD11, Nektar::StdRegions::eVarCoeffD22, Nektar::SolverUtils::GetDiffusionFactory(), GetFluxVector(), m_d00, m_d11, m_d22, m_diffusion, m_epsilon, Nektar::SolverUtils::UnsteadySystem::m_explicitDiffusion, Nektar::SolverUtils::EquationSystem::m_fields, Nektar::SolverUtils::UnsteadySystem::m_homoInitialFwd, Nektar::SolverUtils::UnsteadySystem::m_ode, Nektar::SolverUtils::EquationSystem::m_projectionType, Nektar::SolverUtils::EquationSystem::m_session, m_sVVCutoffRatio, m_sVVDiffCoeff, m_useSpecVanVisc, m_varcoeff, and Nektar::SolverUtils::UnsteadySystem::v_InitObject().

Referenced by Nektar::UnsteadyReactionDiffusion::v_InitObject().

Friends And Related Symbol Documentation

MemoryManager< UnsteadyDiffusion >

friend class MemoryManager< UnsteadyDiffusion >

friend

Definition at line 1 of file UnsteadyDiffusion.h.

Member Data Documentation

className

std::string Nektar::UnsteadyDiffusion::className

static

Initial value:

=
    GetEquationSystemFactory().RegisterCreatorFunction(
        "UnsteadyDiffusion", UnsteadyDiffusion::create)

Name of class.

Definition at line 64 of file UnsteadyDiffusion.h.

m_d00

NekDouble Nektar::UnsteadyDiffusion::m_d00 = 1.0

protected

Definition at line 68 of file UnsteadyDiffusion.h.

Referenced by GetFluxVector(), and v_InitObject().

m_d11

NekDouble Nektar::UnsteadyDiffusion::m_d11 = 1.0

protected

Definition at line 68 of file UnsteadyDiffusion.h.

Referenced by GetFluxVector(), and v_InitObject().

m_d22

NekDouble Nektar::UnsteadyDiffusion::m_d22 = 1.0

protected

Definition at line 68 of file UnsteadyDiffusion.h.

Referenced by GetFluxVector(), and v_InitObject().

m_diffusion

SolverUtils::DiffusionSharedPtr Nektar::UnsteadyDiffusion::m_diffusion

protected

Definition at line 75 of file UnsteadyDiffusion.h.

Referenced by DoOdeRhs(), and v_InitObject().

m_epsilon

NekDouble Nektar::UnsteadyDiffusion::m_epsilon

protected

Definition at line 67 of file UnsteadyDiffusion.h.

Referenced by DoImplicitSolve(), GetFluxVector(), and v_InitObject().

m_riemannSolver

SolverUtils::RiemannSolverSharedPtr Nektar::UnsteadyDiffusion::m_riemannSolver

protected

Definition at line 76 of file UnsteadyDiffusion.h.

m_sVVCutoffRatio

NekDouble Nektar::UnsteadyDiffusion::m_sVVCutoffRatio

protected

Definition at line 71 of file UnsteadyDiffusion.h.

Referenced by DoImplicitSolve(), v_GenerateSummary(), and v_InitObject().

m_sVVDiffCoeff

NekDouble Nektar::UnsteadyDiffusion::m_sVVDiffCoeff

protected

Definition at line 73 of file UnsteadyDiffusion.h.

Referenced by DoImplicitSolve(), v_GenerateSummary(), and v_InitObject().

m_useSpecVanVisc

bool Nektar::UnsteadyDiffusion::m_useSpecVanVisc

protected

Definition at line 69 of file UnsteadyDiffusion.h.

Referenced by DoImplicitSolve(), v_GenerateSummary(), and v_InitObject().

m_varcoeff

StdRegions::VarCoeffMap Nektar::UnsteadyDiffusion::m_varcoeff

protected

Definition at line 74 of file UnsteadyDiffusion.h.

Referenced by DoImplicitSolve(), and v_InitObject().