Nektar::RoeSolver Class Reference

#include <RoeSolver.h>

Inheritance diagram for Nektar::RoeSolver:

Public Member Functions
	RoeSolver ()
	programmatic ctor More...
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...

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

Static Public Attributes
static std::string	solverName

Protected Types
using	ND = NekDouble
Protected Types inherited from Nektar::CompressibleSolver
using	ND = NekDouble

Protected Member Functions
	RoeSolver (const LibUtilities::SessionReaderSharedPtr &pSession)
void	v_PointSolve (ND rhoL, ND rhouL, ND rhovL, ND rhowL, ND EL, ND rhoR, ND rhouR, ND rhovR, ND rhowR, ND ER, ND &rhof, ND &rhouf, ND &rhovf, ND &rhowf, ND &Ef) final
	Roe Riemann solver. More...
void	v_ArraySolve (const Array< OneD, const Array< OneD, ND > > &Fwd, const Array< OneD, const Array< OneD, ND > > &Bwd, Array< OneD, Array< OneD, ND > > &flux) final
Protected Member Functions inherited from Nektar::CompressibleSolver
	CompressibleSolver (const LibUtilities::SessionReaderSharedPtr &pSession)
	Session ctor. More...
	CompressibleSolver ()
	Programmatic ctor. More...
void	v_Solve (const int nDim, const Array< OneD, const Array< OneD, ND > > &Fwd, const Array< OneD, const Array< OneD, ND > > &Bwd, Array< OneD, Array< OneD, ND > > &flux) override
ND	GetRoeSoundSpeed (ND rhoL, ND pL, ND eL, ND HL, ND srL, ND rhoR, ND pR, ND eR, ND HR, ND srR, ND HRoe, ND URoe2, ND srLR)
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 ()
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 Attributes inherited from Nektar::SolverUtils::RiemannSolver
int	m_spacedim
Protected Attributes inherited from Nektar::CompressibleSolver
bool	m_pointSolve
EquationOfStateSharedPtr	m_eos
bool	m_idealGas
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

Definition at line 42 of file RoeSolver.h.

Member Typedef Documentation

ND

using Nektar::RoeSolver::ND = NekDouble

protected

Definition at line 60 of file RoeSolver.h.

Constructor & Destructor Documentation

RoeSolver() [1/2]

Nektar::RoeSolver::RoeSolver

(

)

programmatic ctor

Definition at line 54 of file RoeSolver.cpp.

                    : CompressibleSolver()
{
    // m_pointSolve = false;
}

Referenced by create().

RoeSolver() [2/2]

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

protected

Definition at line 47 of file RoeSolver.cpp.

    : CompressibleSolver(pSession)
{
    // m_pointSolve = false;
}

Member Function Documentation

create()

static RiemannSolverSharedPtr Nektar::RoeSolver::create ( const LibUtilities::SessionReaderSharedPtr &  pSession )

inlinestatic

Definition at line 45 of file RoeSolver.h.

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

References RoeSolver().

v_ArraySolve()

void Nektar::RoeSolver::v_ArraySolve ( const Array< OneD, const Array< OneD, ND > > &  Fwd, const Array< OneD, const Array< OneD, ND > > &  Bwd, Array< OneD, Array< OneD, ND > > &  flux  )

finalprotectedvirtual

Reimplemented from Nektar::CompressibleSolver.

Definition at line 100 of file RoeSolver.cpp.

{
    static auto gamma = m_params["gamma"]();
    static auto nVars = fwd.size();
    static auto spaceDim = nVars-2;
 
    using namespace tinysimd;
    using vec_t = simd<NekDouble>;
 
    // get limit of vectorizable chunk
    size_t sizeScalar = fwd[0].size();
    size_t sizeVec = (sizeScalar / vec_t::width) * vec_t::width;
 
    // SIMD loop
    size_t i = 0;
    for (; i < sizeVec; i+=vec_t::width)
    {
        vec_t rhoL{}, rhouL{}, rhovL{}, rhowL{}, EL{};
        vec_t rhoR{}, rhouR{}, rhovR{}, rhowR{}, ER{};
 
        // load
        rhoL.load(&(fwd[0][i]), is_not_aligned);
        rhouL.load(&(fwd[1][i]), is_not_aligned);
        EL.load(&(fwd[spaceDim+1][i]), is_not_aligned);
        rhoR.load(&(bwd[0][i]), is_not_aligned);
        rhouR.load(&(bwd[1][i]), is_not_aligned);
        ER.load(&(bwd[spaceDim+1][i]), is_not_aligned);
 
        if (spaceDim == 2)
        {
            rhovL.load(&(fwd[2][i]), is_not_aligned);
            rhovR.load(&(bwd[2][i]), is_not_aligned);
        }
        else if (spaceDim == 3)
        {
            rhovL.load(&(fwd[2][i]), is_not_aligned);
            rhowL.load(&(fwd[3][i]), is_not_aligned);
            rhovR.load(&(bwd[2][i]), is_not_aligned);
            rhowR.load(&(bwd[3][i]), is_not_aligned);
        }
 
        vec_t rhof{}, rhouf{}, rhovf{}, rhowf{}, Ef{};
 
        RoeKernel(
            rhoL, rhouL, rhovL, rhowL, EL,
            rhoR, rhouR, rhovR, rhowR, ER,
            rhof, rhouf, rhovf, rhowf, Ef,
            gamma);
 
        // store
        rhof.store(&(flux[0][i]), is_not_aligned);
        rhouf.store(&(flux[1][i]), is_not_aligned);
        Ef.store(&(flux[nVars-1][i]), is_not_aligned);
        if (spaceDim == 2)
        {
            rhovf.store(&(flux[2][i]), is_not_aligned);
        }
        else if (spaceDim == 3)
        {
            rhovf.store(&(flux[2][i]), is_not_aligned);
            rhowf.store(&(flux[3][i]), is_not_aligned);
        }
 
    } // avx loop
 
 
    // spillover loop
    for (; i < sizeScalar; ++i)
    {
        NekDouble rhoL{}, rhouL{}, rhovL{}, rhowL{}, EL{};
        NekDouble rhoR{}, rhouR{}, rhovR{}, rhowR{}, ER{};
 
        // load
        rhoL  = fwd[0][i];
        rhouL = fwd[1][i];
        EL    = fwd[spaceDim+1][i];
        rhoR  = bwd[0][i];
        rhouR = bwd[1][i];
        ER    = bwd[spaceDim+1][i];
 
        if (spaceDim == 2)
        {
            rhovL = fwd[2][i];
            rhovR = bwd[2][i];
        }
        else if (spaceDim == 3)
        {
            rhovL = fwd[2][i];
            rhowL = fwd[3][i];
            rhovR = bwd[2][i];
            rhowR = bwd[3][i];
        }
 
        NekDouble rhof{}, rhouf{}, rhovf{}, rhowf{}, Ef{};
 
        RoeKernel(
            rhoL, rhouL, rhovL, rhowL, EL,
            rhoR, rhouR, rhovR, rhowR, ER,
            rhof, rhouf, rhovf, rhowf, Ef,
            gamma);
 
        // store
        flux[0][i] = rhof;
        flux[1][i] = rhouf;
        flux[nVars-1][i] = Ef;
        if (spaceDim == 2)
        {
            flux[2][i] = rhovf;
        }
        else if (spaceDim == 3)
        {
            flux[2][i] = rhovf;
            flux[3][i] = rhowf;
        }
 
    } // loop
 
}

References tinysimd::is_not_aligned, Nektar::SolverUtils::RiemannSolver::m_params, and Nektar::RoeKernel().

v_PointSolve()

void Nektar::RoeSolver::v_PointSolve ( ND  rhoL, ND  rhouL, ND  rhovL, ND  rhowL, ND  EL, ND  rhoR, ND  rhouR, ND  rhovR, ND  rhowR, ND  ER, ND &  rhof, ND &  rhouf, ND &  rhovf, ND &  rhowf, ND &  Ef  )

finalprotectedvirtual

Roe Riemann solver.

Stated equations numbers are from:

"Riemann Solvers and Numerical Methods for Fluid Dynamics: A Practical Introduction", E. F. Toro (3rd edition, 2009).

We follow the algorithm prescribed following equation 11.70.

Parameters

rhoL	Density left state.
rhoR	Density right state.
rhouL	x-momentum component left state.
rhouR	x-momentum component right state.
rhovL	y-momentum component left state.
rhovR	y-momentum component right state.
rhowL	z-momentum component left state.
rhowR	z-momentum component right state.
EL	Energy left state.
ER	Energy right state.
rhof	Computed Riemann flux for density.
rhouf	Computed Riemann flux for x-momentum component
rhovf	Computed Riemann flux for y-momentum component
rhowf	Computed Riemann flux for z-momentum component
Ef	Computed Riemann flux for energy.

Reimplemented from Nektar::CompressibleSolver.

Definition at line 85 of file RoeSolver.cpp.

{
    static NekDouble gamma = m_params["gamma"]();
 
    RoeKernel(
        rhoL, rhouL, rhovL, rhowL, EL,
        rhoR, rhouR, rhovR, rhowR, ER,
        rhof, rhouf, rhovf, rhowf, Ef,
        gamma);
}

References Nektar::SolverUtils::RiemannSolver::m_params, and Nektar::RoeKernel().

Member Data Documentation

solverName

std::string Nektar::RoeSolver::solverName

static

Initial value:

=
    SolverUtils::GetRiemannSolverFactory().RegisterCreatorFunction(
        "Roe",
        RoeSolver::create,
        "Roe Riemann solver")

Definition at line 52 of file RoeSolver.h.