#include <VelocityCorrectionScheme.h>

Inheritance diagram for Nektar::VelocityCorrectionScheme:

Collaboration diagram for Nektar::VelocityCorrectionScheme:

Public Member Functions
	VelocityCorrectionScheme (const LibUtilities::SessionReaderSharedPtr &pSession)
	Constructor.
virtual	~VelocityCorrectionScheme ()
virtual void	v_InitObject ()
	Init object for UnsteadySystem class.
void	SetUpPressureForcing (const Array< OneD, const Array< OneD, NekDouble > > &fields, Array< OneD, Array< OneD, NekDouble > > &Forcing, const NekDouble aii_Dt)
void	SetUpViscousForcing (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &Forcing, const NekDouble aii_Dt)
void	SolveUnsteadyStokesSystem (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, const NekDouble time, const NekDouble a_iixDt)
void	EvaluateAdvection_SetPressureBCs (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, const NekDouble time)
Public Member Functions inherited from Nektar::IncNavierStokes
virtual	~IncNavierStokes ()
virtual void	v_GetFluxVector (const int i, Array< OneD, Array< OneD, NekDouble > > &physfield, Array< OneD, Array< OneD, NekDouble > > &flux)
virtual void	v_NumericalFlux (Array< OneD, Array< OneD, NekDouble > > &physfield, Array< OneD, Array< OneD, NekDouble > > &numflux)
int	GetNConvectiveFields (void)
Array< OneD, int > &	GetVelocity (void)
Array< OneD, NekDouble >	GetElmtCFLVals (void)
NekDouble	GetCFLEstimate (int &elmtid)
void	AddForcing (const SolverUtils::ForcingSharedPtr &pForce)
Public Member Functions inherited from Nektar::SolverUtils::AdvectionSystem
SOLVER_UTILS_EXPORT	AdvectionSystem (const LibUtilities::SessionReaderSharedPtr &pSession)
virtual SOLVER_UTILS_EXPORT	~AdvectionSystem ()
AdvectionSharedPtr	GetAdvObject ()
	Returns the advection object held by this instance.
Public Member Functions inherited from Nektar::SolverUtils::UnsteadySystem
virtual SOLVER_UTILS_EXPORT	~UnsteadySystem ()
	Destructor.
SOLVER_UTILS_EXPORT NekDouble	GetTimeStep (const Array< OneD, const Array< OneD, NekDouble > > &inarray)
	Calculate the larger time-step mantaining the problem stable.
Public Member Functions inherited from Nektar::SolverUtils::EquationSystem
virtual SOLVER_UTILS_EXPORT	~EquationSystem ()
	Destructor.
SOLVER_UTILS_EXPORT void	SetUpTraceNormals (void)
SOLVER_UTILS_EXPORT void	InitObject ()
	Initialises the members of this object.
SOLVER_UTILS_EXPORT void	DoInitialise ()
	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 NekDouble	LinfError (unsigned int field, const Array< OneD, NekDouble > &exactsoln=NullNekDouble1DArray)
	Linf error computation.
SOLVER_UTILS_EXPORT std::string	GetSessionName ()
	Get Session name.
template<class T >
boost::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	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 void	EvaluateFunction (Array< OneD, Array< OneD, NekDouble > > &pArray, std::string pFunctionName, const NekDouble pTime=0.0, const int domain=0)
	Evaluates a function as specified in the session file.
SOLVER_UTILS_EXPORT void	EvaluateFunction (std::vector< std::string > pFieldNames, Array< OneD, Array< OneD, NekDouble > > &pFields, const std::string &pName, const int domain=0)
	Populate given fields with the function from session.
SOLVER_UTILS_EXPORT void	EvaluateFunction (std::vector< std::string > pFieldNames, Array< OneD, MultiRegions::ExpListSharedPtr > &pFields, const std::string &pName, const int domain=0)
	Populate given fields with the function from session.
SOLVER_UTILS_EXPORT void	EvaluateFunction (std::string pFieldName, Array< OneD, NekDouble > &pArray, const std::string &pFunctionName, const NekDouble &pTime=0.0, const int domain=0)
SOLVER_UTILS_EXPORT std::string	DescribeFunction (std::string pFieldName, const std::string &pFunctionName, const int domain)
	Provide a description of a function for a given field name.
SOLVER_UTILS_EXPORT void	InitialiseBaseFlow (Array< OneD, Array< OneD, NekDouble > > &base)
	Perform initialisation of the base flow.
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 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	WeakAdvectionGreensDivergenceForm (const Array< OneD, Array< OneD, NekDouble > > &F, Array< OneD, NekDouble > &outarray)
	Compute the inner product $(\nabla \phi \cdot F)$ .
SOLVER_UTILS_EXPORT void	WeakAdvectionDivergenceForm (const Array< OneD, Array< OneD, NekDouble > > &F, Array< OneD, NekDouble > &outarray)
	Compute the inner product $(\phi, \nabla \cdot F)$ .
SOLVER_UTILS_EXPORT void	WeakAdvectionNonConservativeForm (const Array< OneD, Array< OneD, NekDouble > > &V, const Array< OneD, const NekDouble > &u, Array< OneD, NekDouble > &outarray, bool UseContCoeffs=false)
	Compute the inner product $(\phi, V\cdot \nabla u)$ .
f SOLVER_UTILS_EXPORT void	AdvectionNonConservativeForm (const Array< OneD, Array< OneD, NekDouble > > &V, const Array< OneD, const NekDouble > &u, Array< OneD, NekDouble > &outarray, Array< OneD, NekDouble > &wk=NullNekDouble1DArray)
	Compute the non-conservative advection.
SOLVER_UTILS_EXPORT void	WeakDGAdvection (const Array< OneD, Array< OneD, NekDouble > > &InField, Array< OneD, Array< OneD, NekDouble > > &OutField, bool NumericalFluxIncludesNormal=true, bool InFieldIsInPhysSpace=false, int nvariables=0)
	Calculate the weak discontinuous Galerkin advection.
SOLVER_UTILS_EXPORT void	WeakDGDiffusion (const Array< OneD, Array< OneD, NekDouble > > &InField, Array< OneD, Array< OneD, NekDouble > > &OutField, bool NumericalFluxIncludesNormal=true, bool InFieldIsInPhysSpace=false)
	Calculate weak DG Diffusion in the LDG form.
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	ScanForHistoryPoints ()
	Builds map of which element holds each history point.
SOLVER_UTILS_EXPORT void	WriteHistoryData (std::ostream &out)
	Probe each history point and write to 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	GetFinalTime ()
	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	GetNumElmVelocity ()
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, Array< OneD, NekDouble > &output)
SOLVER_UTILS_EXPORT void	SetStepsToOne ()
SOLVER_UTILS_EXPORT void	ZeroPhysFields ()
SOLVER_UTILS_EXPORT void	FwdTransFields ()
SOLVER_UTILS_EXPORT void	GetFluxVector (const int i, Array< OneD, Array< OneD, NekDouble > > &physfield, Array< OneD, Array< OneD, NekDouble > > &flux)
SOLVER_UTILS_EXPORT void	GetFluxVector (const int i, Array< OneD, Array< OneD, NekDouble > > &physfield, Array< OneD, Array< OneD, NekDouble > > &fluxX, Array< OneD, Array< OneD, NekDouble > > &fluxY)
SOLVER_UTILS_EXPORT void	GetFluxVector (const int i, const int j, Array< OneD, Array< OneD, NekDouble > > &physfield, Array< OneD, Array< OneD, NekDouble > > &flux)
SOLVER_UTILS_EXPORT void	NumericalFlux (Array< OneD, Array< OneD, NekDouble > > &physfield, Array< OneD, Array< OneD, NekDouble > > &numflux)
SOLVER_UTILS_EXPORT void	NumericalFlux (Array< OneD, Array< OneD, NekDouble > > &physfield, Array< OneD, Array< OneD, NekDouble > > &numfluxX, Array< OneD, Array< OneD, NekDouble > > &numfluxY)
SOLVER_UTILS_EXPORT void	NumFluxforScalar (const Array< OneD, Array< OneD, NekDouble > > &ufield, Array< OneD, Array< OneD, Array< OneD, NekDouble > > > &uflux)
SOLVER_UTILS_EXPORT void	NumFluxforVector (const Array< OneD, Array< OneD, NekDouble > > &ufield, Array< OneD, Array< OneD, Array< OneD, NekDouble > > > &qfield, Array< OneD, Array< OneD, NekDouble > > &qflux)
SOLVER_UTILS_EXPORT void	SetModifiedBasis (const bool modbasis)
SOLVER_UTILS_EXPORT int	NoCaseStringCompare (const string &s1, const string &s2)
	Perform a case-insensitive string comparison.

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

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

Private Member Functions
virtual void	v_GenerateSummary (SolverUtils::SummaryList &s)
virtual void	v_TransCoeffToPhys (void)
virtual void	v_TransPhysToCoeff (void)
virtual void	v_DoInitialise (void)
virtual Array< OneD, bool >	v_GetSystemSingularChecks ()
virtual int	v_GetForceDimension ()

Private Attributes
bool	m_useHomo1DSpecVanVisc
	bool to identify if spectral vanishing viscosity is active.
bool	m_useSpecVanVisc
	bool to identify if spectral vanishing viscosity is active.
NekDouble	m_sVVCutoffRatio
	cutt off ratio from which to start decayhing modes
NekDouble	m_sVVDiffCoeff
	Diffusion coefficient of SVV modes.

Additional Inherited Members
Public Attributes inherited from Nektar::SolverUtils::UnsteadySystem
NekDouble	m_cflSafetyFactor
	CFL safety factor (comprise between 0 to 1).
Protected Types inherited from Nektar::SolverUtils::EquationSystem
enum	HomogeneousType { eHomogeneous1D, eHomogeneous2D, eHomogeneous3D, eNotHomogeneous }
	Parameter for homogeneous expansions. More...
Protected Member Functions inherited from Nektar::IncNavierStokes
	IncNavierStokes (const LibUtilities::SessionReaderSharedPtr &pSession)
	Constructor.
EquationType	GetEquationType (void)
void	EvaluateAdvectionTerms (const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, Array< OneD, NekDouble > &wk=NullNekDouble1DArray)
void	WriteModalEnergy (void)
void	SetBoundaryConditions (NekDouble time)
	time dependent boundary conditions updating
void	SetRadiationBoundaryForcing (int fieldid)
	Set Radiation forcing term.
bool	CalcSteadyState (void)
	evaluate steady state
virtual MultiRegions::ExpListSharedPtr	v_GetPressure ()
virtual void	v_TransCoeffToPhys (void)
	Virtual function for transformation to physical space.
virtual void	v_TransPhysToCoeff (void)
	Virtual function for transformation to coefficient space.
virtual int	v_GetForceDimension ()=0
virtual bool	v_PreIntegrate (int step)
virtual bool	v_PostIntegrate (int step)
Protected Attributes inherited from Nektar::IncNavierStokes
ExtrapolateSharedPtr	m_extrapolation
std::ofstream	m_mdlFile
	modal energy file
bool	m_subSteppingScheme
	bool to identify if using a substepping scheme
bool	m_SmoothAdvection
	bool to identify if advection term smoothing is requested
LibUtilities::TimeIntegrationWrapperSharedPtr	m_subStepIntegrationScheme
std::vector < SolverUtils::ForcingSharedPtr >	m_forcing
	Forcing terms.
int	m_nConvectiveFields
	Number of fields to be convected;.
Array< OneD, int >	m_velocity
	int which identifies which components of m_fields contains the velocity (u,v,w);
MultiRegions::ExpListSharedPtr	m_pressure
	Pointer to field holding pressure field.
NekDouble	m_kinvis
	Kinematic viscosity.
int	m_energysteps
	dump energy to file at steps time
int	m_cflsteps
	dump cfl estimate
int	m_steadyStateSteps
	Check for steady state at step interval.
NekDouble	m_steadyStateTol
	Tolerance to which steady state should be evaluated at.
EquationType	m_equationType
	equation type;
Array< OneD, Array< OneD, int > >	m_fieldsBCToElmtID
	Mapping from BCs to Elmt IDs.
Array< OneD, Array< OneD, int > >	m_fieldsBCToTraceID
	Mapping from BCs to Elmt Edge IDs.
Array< OneD, Array< OneD, NekDouble > >	m_fieldsRadiationFactor
	RHS Factor for Radiation Condition.
int	m_intSteps
	Number of time integration steps AND Order of extrapolation for pressure boundary conditions.

Detailed Description

Definition at line 43 of file VelocityCorrectionScheme.h.

Constructor & Destructor Documentation

Nektar::VelocityCorrectionScheme::VelocityCorrectionScheme ( const LibUtilities::SessionReaderSharedPtr & pSession )

Constructor.

Constructor. Creates ...

Parameters

\param

Definition at line 55 of file VelocityCorrectionScheme.cpp.

        : UnsteadySystem(pSession),
          IncNavierStokes(pSession)
    {
    }

Nektar::VelocityCorrectionScheme::~VelocityCorrectionScheme ( void )

virtual

Destructor

Definition at line 177 of file VelocityCorrectionScheme.cpp.

{

}

Member Function Documentation

static SolverUtils::EquationSystemSharedPtr Nektar::VelocityCorrectionScheme::create ( const LibUtilities::SessionReaderSharedPtr & pSession )

inlinestatic

Creates an instance of this class.

Definition at line 48 of file VelocityCorrectionScheme.h.

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

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

Explicit part of the method - Advection, Forcing + HOPBCs

Definition at line 293 of file VelocityCorrectionScheme.cpp.

References Nektar::IncNavierStokes::EvaluateAdvectionTerms(), Nektar::IncNavierStokes::m_extrapolation, Nektar::SolverUtils::EquationSystem::m_fields, Nektar::IncNavierStokes::m_forcing, Nektar::IncNavierStokes::m_kinvis, Nektar::IncNavierStokes::m_nConvectiveFields, Nektar::IncNavierStokes::m_pressure, and Nektar::IncNavierStokes::m_SmoothAdvection.

Referenced by v_InitObject().

    {
        EvaluateAdvectionTerms(inarray, outarray);
        // Smooth advection
        if(m_SmoothAdvection)
        {
            for(int i = 0; i < m_nConvectiveFields; ++i)
            {
                m_pressure->SmoothField(outarray[i]);
            }
        }
        // Add forcing terms
        std::vector<SolverUtils::ForcingSharedPtr>::const_iterator x;
        for (x = m_forcing.begin(); x != m_forcing.end(); ++x)
        {
            (*x)->Apply(m_fields, inarray, outarray, time);
        }
        
        // Calculate High-Order pressure boundary conditions
        m_extrapolation->EvaluatePressureBCs(inarray,outarray,m_kinvis);
    }

void Nektar::VelocityCorrectionScheme::SetUpPressureForcing	(	const Array< OneD, const Array< OneD, NekDouble > > &	fields,
		Array< OneD, Array< OneD, NekDouble > > &	Forcing,
		const NekDouble	aii_Dt
	)

Forcing term for Poisson solver solver

Definition at line 375 of file VelocityCorrectionScheme.cpp.

References Nektar::MultiRegions::DirCartesianMap, Nektar::SolverUtils::EquationSystem::m_fields, Nektar::IncNavierStokes::m_velocity, Vmath::Smul(), Vmath::Vadd(), and Vmath::Zero().

Referenced by SolveUnsteadyStokesSystem().

    {                
        int i;
        int physTot = m_fields[0]->GetTotPoints();
        int nvel = m_velocity.num_elements();
        Array<OneD, NekDouble> wk(physTot, 0.0);
        
        Vmath::Zero(physTot,Forcing[0],1);
        
        for(i = 0; i < nvel; ++i)
        {
            m_fields[i]->PhysDeriv(MultiRegions::DirCartesianMap[i],fields[i], wk);
            Vmath::Vadd(physTot,wk,1,Forcing[0],1,Forcing[0],1);
        }
        Vmath::Smul(physTot,1.0/aii_Dt,Forcing[0],1,Forcing[0],1);        
    }

void Nektar::VelocityCorrectionScheme::SetUpViscousForcing	(	const Array< OneD, const Array< OneD, NekDouble > > &	inarray,
		Array< OneD, Array< OneD, NekDouble > > &	Forcing,
		const NekDouble	aii_Dt
	)

Forcing term for Helmholtz solver

Definition at line 398 of file VelocityCorrectionScheme.cpp.

References Nektar::SolverUtils::EquationSystem::m_fields, Nektar::IncNavierStokes::m_kinvis, Nektar::IncNavierStokes::m_pressure, and Nektar::IncNavierStokes::m_velocity.

Referenced by SolveUnsteadyStokesSystem().

    {
        NekDouble aii_dtinv = 1.0/aii_Dt;
        int phystot = m_fields[0]->GetTotPoints();
        // Grad p
        m_pressure->BwdTrans(m_pressure->GetCoeffs(),m_pressure->UpdatePhys());
        
        int nvel = m_velocity.num_elements();
        if(nvel == 2)
        {
            m_pressure->PhysDeriv(m_pressure->GetPhys(), Forcing[0], Forcing[1]);
        }
        else
        {
            m_pressure->PhysDeriv(m_pressure->GetPhys(), Forcing[0], Forcing[1],
                                  Forcing[2]);
        }
        
        // Subtract inarray/(aii_dt) and divide by kinvis. Kinvis will
        // need to be updated for the convected fields.
        for(int i = 0; i < nvel; ++i)
        {
            Blas::Daxpy(phystot,-aii_dtinv,inarray[i],1,Forcing[i],1);
            Blas::Dscal(phystot,1.0/m_kinvis,&(Forcing[i])[0],1);
        }
    }

void Nektar::VelocityCorrectionScheme::SolveUnsteadyStokesSystem	(	const Array< OneD, const Array< OneD, NekDouble > > &	inarray,
		Array< OneD, Array< OneD, NekDouble > > &	outarray,
		const NekDouble	time,
		const NekDouble	aii_Dt
	)

Implicit part of the method - Poisson + nConv*Helmholtz

Definition at line 323 of file VelocityCorrectionScheme.cpp.

References Nektar::StdRegions::eFactorLambda, Nektar::StdRegions::eFactorSVVCutoffRatio, Nektar::StdRegions::eFactorSVVDiffCoeff, Nektar::IncNavierStokes::m_extrapolation, Nektar::SolverUtils::EquationSystem::m_fields, Nektar::IncNavierStokes::m_kinvis, Nektar::IncNavierStokes::m_nConvectiveFields, Nektar::IncNavierStokes::m_pressure, m_sVVCutoffRatio, m_sVVDiffCoeff, m_useSpecVanVisc, Nektar::NullFlagList, Nektar::IncNavierStokes::SetBoundaryConditions(), SetUpPressureForcing(), and SetUpViscousForcing().

Referenced by v_InitObject().

    {
        int i;
        int phystot = m_fields[0]->GetTotPoints();
        StdRegions::ConstFactorMap factors;
        Array<OneD, Array< OneD, NekDouble> > F(m_nConvectiveFields);
        for(i = 0; i < m_nConvectiveFields; ++i)
        {
            F[i] = Array<OneD, NekDouble> (phystot);
        }
        // Enforcing boundary conditions on all fields
        SetBoundaryConditions(time);
        
        // Substep the pressure boundary condition
        m_extrapolation->SubStepSetPressureBCs(inarray,aii_Dt,m_kinvis);
    
        // Set up forcing term and coefficients for pressure Poisson equation
        SetUpPressureForcing(inarray, F, aii_Dt);
        factors[StdRegions::eFactorLambda] = 0.0;
        // Solver Pressure Poisson Equation
        m_pressure->HelmSolve(F[0], m_pressure->UpdateCoeffs(), NullFlagList,
                              factors);
        // Set up forcing term and coefficients for Helmholtz problems
        SetUpViscousForcing(inarray, F, aii_Dt);
        factors[StdRegions::eFactorLambda] = 1.0/aii_Dt/m_kinvis;
        if(m_useSpecVanVisc)
        {
            factors[StdRegions::eFactorSVVCutoffRatio] = m_sVVCutoffRatio;
            factors[StdRegions::eFactorSVVDiffCoeff]   = m_sVVDiffCoeff/m_kinvis;
        }
        // Solve Helmholtz system and put in Physical space
        for(i = 0; i < m_nConvectiveFields; ++i)
        {
            m_fields[i]->HelmSolve(F[i], m_fields[i]->UpdateCoeffs(),
                                   NullFlagList, factors);
            m_fields[i]->BwdTrans(m_fields[i]->GetCoeffs(),outarray[i]);
        }
    }

void Nektar::VelocityCorrectionScheme::v_DoInitialise ( void )

privatevirtual

Definition at line 223 of file VelocityCorrectionScheme.cpp.

References Nektar::SolverUtils::EquationSystem::m_fieldMetaDataMap, Nektar::SolverUtils::EquationSystem::m_fields, Nektar::IncNavierStokes::m_kinvis, Nektar::IncNavierStokes::m_nConvectiveFields, and Nektar::SolverUtils::EquationSystem::m_timestep.

    {
        UnsteadySystem::v_DoInitialise();
        // Set up Field Meta Data for output files
        m_fieldMetaDataMap["Kinvis"]   = boost::lexical_cast<std::string>(m_kinvis);
        m_fieldMetaDataMap["TimeStep"] = boost::lexical_cast<std::string>(m_timestep);
        for(int i = 0; i < m_nConvectiveFields; ++i)
        {
            m_fields[i]->LocalToGlobal();
            m_fields[i]->ImposeDirichletConditions(m_fields[i]->UpdateCoeffs());
            m_fields[i]->GlobalToLocal();
            m_fields[i]->BwdTrans(m_fields[i]->GetCoeffs(),
                                  m_fields[i]->UpdatePhys());
        }
    }

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

privatevirtual

Definition at line 184 of file VelocityCorrectionScheme.cpp.

References Nektar::SolverUtils::AddSummaryItem(), Nektar::SolverUtils::EquationSystem::m_homogen_dealiasing, Nektar::SolverUtils::EquationSystem::m_specHP_dealiasing, Nektar::IncNavierStokes::m_subStepIntegrationScheme, Nektar::IncNavierStokes::m_subSteppingScheme, m_sVVCutoffRatio, m_sVVDiffCoeff, m_useHomo1DSpecVanVisc, m_useSpecVanVisc, and Nektar::LibUtilities::TimeIntegrationMethodMap.

    {
        UnsteadySystem::v_GenerateSummary(s);
        if (m_subSteppingScheme)
        {
            SolverUtils::AddSummaryItem(
                s, "Substepping", LibUtilities::TimeIntegrationMethodMap[
                    m_subStepIntegrationScheme->GetIntegrationMethod()]);
        }
        string dealias = m_homogen_dealiasing ? "Homogeneous1D" : "";
        if (m_specHP_dealiasing)
        {
            dealias += (dealias == "" ? "" : " + ") + string("spectral/hp");
        }
        if (dealias != "")
        {
            SolverUtils::AddSummaryItem(s, "Dealiasing", dealias);
        }
        string smoothing = m_useSpecVanVisc ? "spectral/hp" : "";
        if (m_useHomo1DSpecVanVisc)
        {
            smoothing += (smoothing == "" ? "" : " + ") + string("Homogeneous1D");
        }
        if (smoothing != "")
        {
            SolverUtils::AddSummaryItem(
                s, "Smoothing", "SVV (" + smoothing + " SVV (cut-off = "
                + boost::lexical_cast<string>(m_sVVCutoffRatio)
                + ", diff coeff = "
                + boost::lexical_cast<string>(m_sVVDiffCoeff)+")");
        }
    }

int Nektar::VelocityCorrectionScheme::v_GetForceDimension ( void )

privatevirtual

Definition at line 285 of file VelocityCorrectionScheme.cpp.

References Nektar::SolverUtils::EquationSystem::m_session.

    {
        return m_session->GetVariables().size() - 1;
    }

Array< OneD, bool > Nektar::VelocityCorrectionScheme::v_GetSystemSingularChecks ( )

privatevirtual

Definition at line 274 of file VelocityCorrectionScheme.cpp.

References Nektar::SolverUtils::EquationSystem::m_session.

    {
        int vVar = m_session->GetVariables().size();
        Array<OneD, bool> vChecks(vVar, false);
        vChecks[vVar-1] = true;
        return vChecks;
    }

void Nektar::VelocityCorrectionScheme::v_InitObject ( )

virtual

Init object for UnsteadySystem class.

Initialization object for UnsteadySystem class.

Reimplemented from Nektar::IncNavierStokes.

Definition at line 63 of file VelocityCorrectionScheme.cpp.

    {
        int n;
        IncNavierStokes::v_InitObject();
        // Set m_pressure to point to last field of m_fields;
        if (boost::iequals(m_session->GetVariable(m_fields.num_elements()-1), "p"))
        {
            m_nConvectiveFields = m_fields.num_elements()-1;
            m_pressure = m_fields[m_nConvectiveFields];
        }
        else
        {
            ASSERTL0(false,"Need to set up pressure field definition");
        }
        // creation of the extrapolation object
        if(m_equationType == eUnsteadyNavierStokes)
        {
            std::string vExtrapolation = "Standard";
            if (m_session->DefinesSolverInfo("Extrapolation"))
            {
                vExtrapolation = m_session->GetSolverInfo("Extrapolation");
            }
            m_extrapolation = GetExtrapolateFactory().CreateInstance(
                vExtrapolation,
                m_session,
                m_fields,
                m_pressure,
                m_velocity,
                m_advObject);
        }
        // Integrate only the convective fields
        for (n = 0; n < m_nConvectiveFields; ++n)
        {
            m_intVariables.push_back(n);
        }
        
        // Load parameters for Spectral Vanishing Viscosity
        m_session->MatchSolverInfo("SpectralVanishingViscosity","True",m_useSpecVanVisc,false);
        m_session->LoadParameter("SVVCutoffRatio",m_sVVCutoffRatio,0.75);
        m_session->LoadParameter("SVVDiffCoeff",m_sVVDiffCoeff,0.1);
        m_session->MatchSolverInfo("SPECTRALHPDEALIASING","True",m_specHP_dealiasing,false);
        // Needs to be set outside of next if so that it is turned off by default
        m_session->MatchSolverInfo("SpectralVanishingViscosityHomo1D","True",m_useHomo1DSpecVanVisc,false);
        if(m_HomogeneousType == eHomogeneous1D)
        {
            ASSERTL0(m_nConvectiveFields > 2,"Expect to have three velcoity fields with homogenous expansion");
            if(m_useHomo1DSpecVanVisc == false)
            {
                m_session->MatchSolverInfo("SpectralVanishingViscosity","True",m_useHomo1DSpecVanVisc,false);
            }
            if(m_useHomo1DSpecVanVisc)
            {
                Array<OneD, unsigned int> planes;
                planes = m_fields[0]->GetZIDs();
                int num_planes = planes.num_elements();
                Array<OneD, NekDouble> SVV(num_planes,0.0);
                NekDouble fac;
                int kmodes = m_fields[0]->GetHomogeneousBasis()->GetNumModes();
                int pstart;
                pstart = m_sVVCutoffRatio*kmodes;
                
                for(n = 0; n < num_planes; ++n)
                {
                    if(planes[n] > pstart)
                    {
                        fac = (NekDouble)((planes[n] - kmodes)*(planes[n] - kmodes))/
                            ((NekDouble)((planes[n] - pstart)*(planes[n] - pstart)));
                        SVV[n] = m_sVVDiffCoeff*exp(-fac)/m_kinvis;
                    }
                }
                for(int i = 0; i < m_velocity.num_elements(); ++i)
                {
                    m_fields[m_velocity[i]]->SetHomo1DSpecVanVisc(SVV);
                }
            }
            
        }
        m_session->MatchSolverInfo("SmoothAdvection", "True", m_SmoothAdvection, false);
        if(m_subSteppingScheme) // Substepping
        {
            ASSERTL0(m_projectionType == MultiRegions::eMixed_CG_Discontinuous,
                     "Projection must be set to Mixed_CG_Discontinuous for "
                     "substepping");
        }
        else // Standard velocity correction scheme
        {
            // set explicit time-intregration class operators
            m_ode.DefineOdeRhs(&VelocityCorrectionScheme::EvaluateAdvection_SetPressureBCs, this);
        }
        m_extrapolation->SubSteppingTimeIntegration(m_intScheme->GetIntegrationMethod(), m_intScheme);
        m_extrapolation->GenerateHOPBCMap();
        
        // set implicit time-intregration class operators
        m_ode.DefineImplicitSolve(&VelocityCorrectionScheme::SolveUnsteadyStokesSystem,this);
    }

void Nektar::VelocityCorrectionScheme::v_TransCoeffToPhys ( void )

privatevirtual

Definition at line 246 of file VelocityCorrectionScheme.cpp.

References Nektar::SolverUtils::EquationSystem::m_fields.

    {
        int nfields = m_fields.num_elements() - 1;
        for (int k=0 ; k < nfields; ++k)
        {
            //Backward Transformation in physical space for time evolution
            m_fields[k]->BwdTrans_IterPerExp(m_fields[k]->GetCoeffs(),
                                             m_fields[k]->UpdatePhys());
        }
    }

void Nektar::VelocityCorrectionScheme::v_TransPhysToCoeff ( void )

privatevirtual

Definition at line 260 of file VelocityCorrectionScheme.cpp.

References Nektar::SolverUtils::EquationSystem::m_fields.

    {
        
        int nfields = m_fields.num_elements() - 1;
        for (int k=0 ; k < nfields; ++k)
        {
            //Forward Transformation in physical space for time evolution
            m_fields[k]->FwdTrans_IterPerExp(m_fields[k]->GetPhys(),m_fields[k]->UpdateCoeffs());
        }
    }

Member Data Documentation

string Nektar::VelocityCorrectionScheme::className

static

Initial value:

 
        SolverUtils::GetEquationSystemFactory().RegisterCreatorFunction(
            "VelocityCorrectionScheme", 
            VelocityCorrectionScheme::create)

Name of class.

Definition at line 58 of file VelocityCorrectionScheme.h.

NekDouble Nektar::VelocityCorrectionScheme::m_sVVCutoffRatio

private

cutt off ratio from which to start decayhing modes

Definition at line 93 of file VelocityCorrectionScheme.h.

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

NekDouble Nektar::VelocityCorrectionScheme::m_sVVDiffCoeff

private

Diffusion coefficient of SVV modes.

Definition at line 95 of file VelocityCorrectionScheme.h.

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