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Diffstat (limited to 'Source/FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CartesianYeeAlgorithm.H')
-rw-r--r-- | Source/FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CartesianYeeAlgorithm.H | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/Source/FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CartesianYeeAlgorithm.H b/Source/FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CartesianYeeAlgorithm.H new file mode 100644 index 000000000..838e3b0bb --- /dev/null +++ b/Source/FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CartesianYeeAlgorithm.H @@ -0,0 +1,122 @@ +/* Copyright 2020 Remi Lehe + * + * This file is part of WarpX. + * + * License: BSD-3-Clause-LBNL + */ + +#ifndef WARPX_FINITE_DIFFERENCE_ALGORITHM_CARTESIAN_YEE_H_ +#define WARPX_FINITE_DIFFERENCE_ALGORITHM_CARTESIAN_YEE_H_ + +#include <AMReX_REAL.H> +#include <AMReX_Array4.H> +#include <AMReX_Gpu.H> + +struct CartesianYeeAlgorithm { + + static void InitializeStencilCoefficients ( + std::array<amrex::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]; + } + + /** + /* Perform derivative along x on a cell-centered grid, from a nodal field `F`*/ + AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE + static amrex::Real UpwardDx ( + amrex::Array4<amrex::Real> const& F, + amrex::Real const * const coefs_x, int const n_coefs_x, + int const i, int const j, int const k ) { + + amrex::Real const inv_dx = coefs_x[0]; + return inv_dx*( F(i+1,j,k) - F(i,j,k) ); + }; + + /** + /* Perform derivative along x on a nodal grid, from a cell-centered field `F`*/ + AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE + static amrex::Real DownwardDx ( + amrex::Array4<amrex::Real> const& F, + amrex::Real const * const coefs_x, int const n_coefs_x, + int const i, int const j, int const k ) { + + amrex::Real const inv_dx = coefs_x[0]; + return inv_dx*( F(i,j,k) - F(i-1,j,k) ); + }; + + /** + /* Perform derivative along y on a cell-centered grid, from a nodal field `F`*/ + AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE + static amrex::Real UpwardDy ( + amrex::Array4<amrex::Real> const& F, + amrex::Real const * const coefs_y, int const n_coefs_y, + int const i, int const j, int const k ) { + +#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 + }; + + /** + /* Perform derivative along y on a nodal grid, from a cell-centered field `F`*/ + AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE + static amrex::Real DownwardDy ( + amrex::Array4<amrex::Real> const& F, + amrex::Real const * const coefs_y, int const n_coefs_y, + int const i, int const j, int const k ) { + +#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 + }; + + /** + /* Perform derivative along z on a cell-centered grid, from a nodal field `F`*/ + AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE + static amrex::Real UpwardDz ( + amrex::Array4<amrex::Real> const& F, + amrex::Real const * const coefs_z, int const n_coefs_z, + int const i, int const j, int const k ) { + + 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 + }; + + /** + /* Perform derivative along z on a nodal grid, from a cell-centered field `F`*/ + AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE + static amrex::Real DownwardDz ( + amrex::Array4<amrex::Real> const& F, + amrex::Real const * const coefs_z, int const n_coefs_z, + int const i, int const j, int const k ) { + + 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_CARTESIAN_YEE_H_ |