Upwind scheme Riemann solver. More...

#include <UpwindSolver.h>

Inheritance diagram for Nektar::SolverUtils::UpwindSolver:

Static Public Member Functions
static SOLVER_UTILS_EXPORT RiemannSolverSharedPtr	create (const LibUtilities::SessionReaderSharedPtr &pSession)

Static Public Attributes
static std::string	solverName

Protected Member Functions
	UpwindSolver (const LibUtilities::SessionReaderSharedPtr &pSession)
	Default constructor. More...

void	v_Solve (const int nDim, const Array< OneD, const Array< OneD, NekDouble > > &Fwd, const Array< OneD, const Array< OneD, NekDouble > > &Bwd, Array< OneD, Array< OneD, NekDouble > > &flux) final
	Implementation of the upwind solver. More...

Protected Member Functions inherited from Nektar::SolverUtils::RiemannSolver
SOLVER_UTILS_EXPORT	RiemannSolver ()

SOLVER_UTILS_EXPORT	RiemannSolver (const LibUtilities::SessionReaderSharedPtr &pSession)

virtual SOLVER_UTILS_EXPORT	~RiemannSolver ()

virtual void	v_Solve (const int nDim, const Array< OneD, const Array< OneD, NekDouble > > &Fwd, const Array< OneD, const Array< OneD, NekDouble > > &Bwd, Array< OneD, Array< OneD, NekDouble > > &flux)=0

SOLVER_UTILS_EXPORT void	GenerateRotationMatrices (const Array< OneD, const Array< OneD, NekDouble > > &normals)
	Generate rotation matrices for 3D expansions. More...

void	FromToRotation (Array< OneD, const NekDouble > &from, Array< OneD, const NekDouble > &to, NekDouble *mat)
	A function for creating a rotation matrix that rotates a vector from into another vector to. More...

SOLVER_UTILS_EXPORT void	rotateToNormal (const Array< OneD, const Array< OneD, NekDouble > > &inarray, const Array< OneD, const Array< OneD, NekDouble > > &normals, const Array< OneD, const Array< OneD, NekDouble > > &vecLocs, Array< OneD, Array< OneD, NekDouble > > &outarray)
	Rotate a vector field to trace normal. More...

SOLVER_UTILS_EXPORT void	rotateFromNormal (const Array< OneD, const Array< OneD, NekDouble > > &inarray, const Array< OneD, const Array< OneD, NekDouble > > &normals, const Array< OneD, const Array< OneD, NekDouble > > &vecLocs, Array< OneD, Array< OneD, NekDouble > > &outarray)
	Rotate a vector field from trace normal. More...

SOLVER_UTILS_EXPORT bool	CheckScalars (std::string name)
	Determine whether a scalar has been defined in m_scalars. More...

SOLVER_UTILS_EXPORT bool	CheckVectors (std::string name)
	Determine whether a vector has been defined in m_vectors. More...

SOLVER_UTILS_EXPORT bool	CheckParams (std::string name)
	Determine whether a parameter has been defined in m_params. More...

SOLVER_UTILS_EXPORT bool	CheckAuxScal (std::string name)
	Determine whether a scalar has been defined in m_auxScal. More...

SOLVER_UTILS_EXPORT bool	CheckAuxVec (std::string name)
	Determine whether a vector has been defined in m_auxVec. More...

virtual SOLVER_UTILS_EXPORT void	v_CalcFluxJacobian (const int nDim, const Array< OneD, const Array< OneD, NekDouble > > &Fwd, const Array< OneD, const Array< OneD, NekDouble > > &Bwd, const Array< OneD, const Array< OneD, NekDouble > > &normals, DNekBlkMatSharedPtr &FJac, DNekBlkMatSharedPtr &BJac)

Additional Inherited Members
Public Member Functions inherited from Nektar::SolverUtils::RiemannSolver
SOLVER_UTILS_EXPORT void	Solve (const int nDim, const Array< OneD, const Array< OneD, NekDouble > > &Fwd, const Array< OneD, const Array< OneD, NekDouble > > &Bwd, Array< OneD, Array< OneD, NekDouble > > &flux)
	Perform the Riemann solve given the forwards and backwards spaces. More...

template<typename FuncPointerT , typename ObjectPointerT >
void	SetScalar (std::string name, FuncPointerT func, ObjectPointerT obj)

void	SetScalar (std::string name, RSScalarFuncType fp)

template<typename FuncPointerT , typename ObjectPointerT >
void	SetVector (std::string name, FuncPointerT func, ObjectPointerT obj)

void	SetVector (std::string name, RSVecFuncType fp)

template<typename FuncPointerT , typename ObjectPointerT >
void	SetParam (std::string name, FuncPointerT func, ObjectPointerT obj)

void	SetParam (std::string name, RSParamFuncType fp)

template<typename FuncPointerT , typename ObjectPointerT >
void	SetAuxScal (std::string name, FuncPointerT func, ObjectPointerT obj)

template<typename FuncPointerT , typename ObjectPointerT >
void	SetAuxVec (std::string name, FuncPointerT func, ObjectPointerT obj)

void	SetAuxVec (std::string name, RSVecFuncType fp)

std::map< std::string, RSScalarFuncType > &	GetScalars ()

std::map< std::string, RSVecFuncType > &	GetVectors ()

std::map< std::string, RSParamFuncType > &	GetParams ()

SOLVER_UTILS_EXPORT void	CalcFluxJacobian (const int nDim, const Array< OneD, const Array< OneD, NekDouble > > &Fwd, const Array< OneD, const Array< OneD, NekDouble > > &Bwd, DNekBlkMatSharedPtr &FJac, DNekBlkMatSharedPtr &BJac)
	Calculate the flux jacobian of Fwd and Bwd. More...

Public Attributes inherited from Nektar::SolverUtils::RiemannSolver
int	m_spacedim

Protected Attributes inherited from Nektar::SolverUtils::RiemannSolver
bool	m_requiresRotation
	Indicates whether the Riemann solver requires a rotation to be applied to the velocity fields. More...

std::map< std::string, RSScalarFuncType >	m_scalars
	Map of scalar function types. More...

std::map< std::string, RSVecFuncType >	m_vectors
	Map of vector function types. More...

std::map< std::string, RSParamFuncType >	m_params
	Map of parameter function types. More...

std::map< std::string, RSScalarFuncType >	m_auxScal
	Map of auxiliary scalar function types. More...

std::map< std::string, RSVecFuncType >	m_auxVec
	Map of auxiliary vector function types. More...

Array< OneD, Array< OneD, NekDouble > >	m_rotMat
	Rotation matrices for each trace quadrature point. More...

Array< OneD, Array< OneD, Array< OneD, NekDouble > > >	m_rotStorage
	Rotation storage. More...

Detailed Description

Upwind scheme Riemann solver.

The upwind solver determines the flux based upon an advection velocity \(\mathbf{V}\) and trace normal \(\mathbf{n}\). In particular, the flux for each component of the velocity field is deterined by:

\[ \mathbf{f}(u^+,u^-) = \begin{cases} \mathbf{V}u^+, & \mathbf{V}\cdot\mathbf{n} \geq 0,\\ \mathbf{V}u^-, & \mathbf{V}\cdot\mathbf{n} < 0.\end{cases} \]

Here the superscript + and - denotes forwards and backwards spaces respectively.

Definition at line 43 of file UpwindSolver.h.

Constructor & Destructor Documentation

◆ UpwindSolver()

Nektar::SolverUtils::UpwindSolver::UpwindSolver ( const LibUtilities::SessionReaderSharedPtr & pSession )

protected

Default constructor.

Definition at line 64 of file UpwindSolver.cpp.

    : RiemannSolver(pSession)
{
}

Referenced by create().

Member Function Documentation

◆ create()

static SOLVER_UTILS_EXPORT RiemannSolverSharedPtr Nektar::SolverUtils::UpwindSolver::create ( const LibUtilities::SessionReaderSharedPtr & pSession )

inlinestatic

Definition at line 46 of file UpwindSolver.h.

    {
        return RiemannSolverSharedPtr(new UpwindSolver(pSession));
    }

References UpwindSolver().

◆ v_Solve()

void Nektar::SolverUtils::UpwindSolver::v_Solve	(	const int	nDim,
		const Array< OneD, const Array< OneD, NekDouble > > &	Fwd,
		const Array< OneD, const Array< OneD, NekDouble > > &	Bwd,
		Array< OneD, Array< OneD, NekDouble > > &	flux
	)

finalprotectedvirtual

Implementation of the upwind solver.

The upwind solver assumes that a scalar field Vn is defined, which corresponds with the dot product \(\mathbf{V}\cdot\mathbf{n}\), where \(\mathbf{V}\) is the advection velocity and \(\mathbf{n}\) defines the normal of a vertex, edge or face at each quadrature point of the trace space.

Parameters

Fwd	Forwards trace space.
Bwd	Backwards trace space.
flux	Resulting flux.

Implements Nektar::SolverUtils::RiemannSolver.

Definition at line 82 of file UpwindSolver.cpp.

{
    ASSERTL1(CheckScalars("Vn"), "Vn not defined.");
    const Array<OneD, NekDouble> &traceVel = m_scalars["Vn"]();
 
    for (int j = 0; j < traceVel.size(); ++j)
    {
        const Array<OneD, const Array<OneD, NekDouble>> &tmp =
            traceVel[j] >= 0 ? Fwd : Bwd;
        for (int i = 0; i < Fwd.size(); ++i)
        {
            flux[i][j] = traceVel[j] * tmp[i][j];
        }
    }
}

References ASSERTL1, Nektar::SolverUtils::RiemannSolver::CheckScalars(), and Nektar::SolverUtils::RiemannSolver::m_scalars.

Member Data Documentation

◆ solverName

std::string Nektar::SolverUtils::UpwindSolver::solverName

static

Initial value:

=
    GetRiemannSolverFactory().RegisterCreatorFunction(
        "Upwind", UpwindSolver::create, "Upwind solver")

Definition at line 52 of file UpwindSolver.h.

Static Public Member Functions

Static Public Attributes

Protected Member Functions

Additional Inherited Members