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/* Copyright 2019 Axel Huebl, David Grote
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#ifndef WARPX_FDTD_H_
#define WARPX_FDTD_H_
#include <AMReX.H>
#include <AMReX_FArrayBox.H>
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
void warpx_computedivb(int i, int j, int k, int dcomp,
amrex::Array4<amrex::Real> const& divB,
amrex::Array4<amrex::Real const> const& Bx,
amrex::Array4<amrex::Real const> const& By,
amrex::Array4<amrex::Real const> const& Bz,
amrex::Real dxinv,
amrex::Real dyinv,
amrex::Real dzinv
#ifdef WARPX_DIM_RZ
, amrex::Real const rmin
#endif
)
{
#if defined WARPX_DIM_3D
divB(i,j,k,dcomp) = (Bx(i+1,j ,k ) - Bx(i,j,k))*dxinv
+ (By(i ,j+1,k ) - By(i,j,k))*dyinv
+ (Bz(i ,j ,k+1) - Bz(i,j,k))*dzinv;
#elif defined WARPX_DIM_XZ
divB(i,j,0,dcomp) = (Bx(i+1,j ,0) - Bx(i,j,0))*dxinv
+ (Bz(i ,j+1,0) - Bz(i,j,0))*dzinv;
amrex::ignore_unused(k, By, dyinv);
#elif defined WARPX_DIM_1D_Z
divB(i,0,0,dcomp) = (Bz(i+1,0 ,0) - Bz(i,0,0))*dzinv;
amrex::ignore_unused(j, Bx, dxinv);
amrex::ignore_unused(k, By, dyinv);
#elif defined WARPX_DIM_RZ
const amrex::Real ru = 1. + 0.5/(rmin*dxinv + i + 0.5);
const amrex::Real rd = 1. - 0.5/(rmin*dxinv + i + 0.5);
divB(i,j,0,dcomp) = (ru*Bx(i+1,j,0) - rd*Bx(i,j,0))*dxinv
+ (Bz(i,j+1,0) - Bz(i,j,0))*dzinv;
amrex::ignore_unused(k, By, dyinv);
#endif
}
#endif
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