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+/* 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_