MomentumToVelocity.cpp File Reference

#include <AMReX.H>
#include <AMReX_MultiFab.H>
#include <Utils.H>

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Functions
void	MomentumToVelocity (MultiFab &xvel, MultiFab &yvel, MultiFab &zvel, const MultiFab &density, const MultiFab &xmom_in, const MultiFab &ymom_in, const MultiFab &zmom_in, const Box &domain, const Vector< BCRec > &domain_bcs_type_h)

Function Documentation

MomentumToVelocity()

void MomentumToVelocity	(	MultiFab &	xvel,
		MultiFab &	yvel,
		MultiFab &	zvel,
		const MultiFab &	density,
		const MultiFab &	xmom_in,
		const MultiFab &	ymom_in,
		const MultiFab &	zmom_in,
		const Box &	domain,
		const Vector< BCRec > &	domain_bcs_type_h
	)

Convert momentum to velocity by dividing by density averaged onto faces

Parameters

[out]	xvel	x-component of velocity
[out]	yvel	y-component of velocity
[out]	zvel	z-component of velocity
[in]	density	density at cell centers
[in]	xmom_in	x-component of momentum
[in]	ymom_in	y-component of momentum
[in]	zmom_in	z-component of momentum
[in]	domain	Domain at this level
[in]	domain_bcs_type_h	host vector for domain boundary conditions

{
    BL_PROFILE_VAR("MomentumToVelocity()",MomentumToVelocity);
 
    const BCRec* bc_ptr_h = domain_bcs_type_h.data();
 
#ifdef _OPENMP
#pragma omp parallel if (amrex::Gpu::notInLaunchRegion())
#endif
    for ( MFIter mfi(density,TilingIfNotGPU()); mfi.isValid(); ++mfi)
    {
        // We need velocity in the interior ghost cells (init == real)
        Box bx = mfi.tilebox();
 
        const Box& tbx = surroundingNodes(bx,0);
        const Box& tby = surroundingNodes(bx,1);
        const Box& tbz = surroundingNodes(bx,2);
 
        // Conserved variables on cell centers -- we use this for density
        const Array4<const Real>& dens_arr = density.array(mfi);
 
        // Momentum on faces
        Array4<Real const> const& momx = xmom_in.const_array(mfi);
        Array4<Real const> const& momy = ymom_in.const_array(mfi);
        Array4<Real const> const& momz = zmom_in.const_array(mfi);
 
        // Velocity on faces
        const Array4<Real>& velx = xvel.array(mfi);
        const Array4<Real>& vely = yvel.array(mfi);
        const Array4<Real>& velz = zvel.array(mfi);
 
        ParallelFor(tbx, tby, tbz,
        [=] AMREX_GPU_DEVICE (int i, int j, int k) {
            velx(i,j,k) = momx(i,j,k) * 2.0 / (dens_arr(i,j,k,Rho_comp) + dens_arr(i-1,j,k,Rho_comp));
        },
        [=] AMREX_GPU_DEVICE (int i, int j, int k) {
            vely(i,j,k) = momy(i,j,k) * 2.0 / (dens_arr(i,j,k,Rho_comp) + dens_arr(i,j-1,k,Rho_comp));
        },
        [=] AMREX_GPU_DEVICE (int i, int j, int k) {
            velz(i,j,k) = momz(i,j,k) * 2.0 / (dens_arr(i,j,k,Rho_comp) + dens_arr(i,j,k-1,Rho_comp));
        });
 
        if ( (bx.smallEnd(0) == domain.smallEnd(0)) &&
             (bc_ptr_h[BCVars::cons_bc].lo(0) == ERFBCType::ext_dir) ) {
            ParallelFor(makeSlab(tbx,0,domain.smallEnd(0)), [=] AMREX_GPU_DEVICE (int i, int j, int k) {
                velx(i,j,k) = momx(i,j,k) / dens_arr(i-1,j,k,Rho_comp);
            });
        }
        if ( (bx.bigEnd(0) == domain.bigEnd(0)) &&
             (bc_ptr_h[BCVars::cons_bc].hi(0) == ERFBCType::ext_dir) ) {
            ParallelFor(makeSlab(tbx,0,domain.bigEnd(0)+1), [=] AMREX_GPU_DEVICE (int i, int j, int k) {
                velx(i,j,k) = momx(i,j,k) / dens_arr(i,j,k,Rho_comp);
            });
        }
        if ( (bx.smallEnd(1) == domain.smallEnd(1)) &&
             (bc_ptr_h[BCVars::cons_bc].lo(1) == ERFBCType::ext_dir) ) {
            ParallelFor(makeSlab(tby,1,domain.smallEnd(1)), [=] AMREX_GPU_DEVICE (int i, int j, int k) {
                vely(i,j,k) = momy(i,j,k) / dens_arr(i,j-1,k,Rho_comp);
            });
        }
        if ( (bx.bigEnd(1) == domain.bigEnd(1)) &&
             (bc_ptr_h[BCVars::cons_bc].hi(1) == ERFBCType::ext_dir) ) {
            ParallelFor(makeSlab(tby,1,domain.bigEnd(1)+1), [=] AMREX_GPU_DEVICE (int i, int j, int k) {
                vely(i,j,k) = momy(i,j,k) / dens_arr(i,j,k,Rho_comp);
            });
        }
    } // end MFIter
}

Referenced by ERF::AverageDownTo(), ERF::FillCoarsePatch(), ERF::FillIntermediatePatch(), and ERF::FillPatch().

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