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#ifndef WARPX_FINITE_DIFFERENCE_ALGORITHM_YEE_H_
#define WARPX_FINITE_DIFFERENCE_ALGORITHM_YEE_H_
struct YeeAlgorithm {
void InitializeStencilCoefficients( std::array<Real,3> cell_size,
amrex::Gpu::ManagedVector<amrex::Real> stencil_coefs_x,
amrex::Gpu::ManagedVector<amrex::Real> stencil_coefs_y,
amrex::Gpu::ManagedVector<amrex::Real> stencil_coefs_z ) {
// Store the inverse cell size along each direction in the coefficients
stencil_coefs_x.resize(1);
stencil_coefs_x[0] = 1./cell_size[0];
stencil_coefs_y.resize(1);
stencil_coefs_y[0] = 1./cell_size[1];
stencil_coefs_z.resize(1);
stencil_coefs_z[0] = 1./cell_size[2];
}
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
amrex::Real UpwardDx(
Array4 const F, int const i, int const j, int const k,
Real const* coefs_x, int const n_coefs_x ) {
amrex::Real const inv_dx = coefs_x[0];
return inv_dx*( F(i+1,j,k) - F(i,j,k) );
};
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
amrex::Real DownwardDx(
Array4 const F, int const i, int const j, int const k,
Real const* coefs_x, int const n_coefs_x ) {
amrex::Real const inv_dx = coefs_x[0];
return inv_dx*( F(i,j,k) - F(i-1,j,k) );
};
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
amrex::Real UpwardDy(
Array4 const F, int const i, int const j, int const k,
Real const* coefs_y, int const n_coefs_y ) {
#if defined WARPX_DIM_3D
amrex::Real const inv_dy = coefs_y[0];
return inv_dy*( F(i,j+1,k) - F(i,j,k) );
#elif (defined WARPX_DIM_XZ)
return 0; // 2D Cartesian: derivative along y is 0
#endif
};
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
amrex::Real DownwardDy(
Array4 const F, int const i, int const j, int const k,
Real const* coefs_y, int const n_coefs_y ) {
#if defined WARPX_DIM_3D
amrex::Real const inv_dy = coefs_y[0];
return inv_dy*( F(i,j,k) - F(i,j-1,k) );
#elif (defined WARPX_DIM_XZ)
return 0; // 2D Cartesian: derivative along y is 0
#endif
};
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
amrex::Real UpwardDz(
Array4 const F, int const i, int const j, int const k,
Real const* coefs_z, int const n_coefs_z ) {
amrex::Real const inv_dz = coefs_z[0];
#if defined WARPX_DIM_3D
return inv_dz*( F(i,j,k+1) - F(i,j,k) );
#elif (defined WARPX_DIM_XZ)
return inv_dz*( F(i,j+1,k) - F(i,j,k) );
#endif
};
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
amrex::Real DownwardDz(
Array4 const F, int const i, int const j, int const k,
Real const* coefs_z, int const n_coefs_z ) {
amrex::Real const inv_dz = coefs_z[0];
#if defined WARPX_DIM_3D
return inv_dz*( F(i,j,k) - F(i,j,k-1) );
#elif (defined WARPX_DIM_XZ)
return inv_dz*( F(i,j,k) - F(i,j-1,k) );
#endif
};
}
#endif // WARPX_FINITE_DIFFERENCE_ALGORITHM_YEE_H_
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