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correct poynting flux at r-boundaries in cylindrical geometries. #6820

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Merged
RemiLehe merged 1 commit into from
Apr 29, 2026
Merged

correct poynting flux at r-boundaries in cylindrical geometries. #6820

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10 changes: 10 additions & 0 deletions Source/Diagnostics/ReducedDiags/FieldPoyntingFlux.H
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Original file line number Diff line number Diff line change
Expand Up @@ -363,6 +363,7 @@ namespace Poynting {
[=] AMREX_GPU_DEVICE (int i, int j, int k) -> amrex::GpuTuple<amrex::Real>
{

using namespace amrex::literals;
constexpr int comp = 0;

// This is needed by the GPU compilers where captured variables cannot first appear
Expand All @@ -371,7 +372,16 @@ namespace Poynting {

amrex::Real const af = area_factor(i,j,k);
if constexpr (normal_dir == 0) {
#if defined(WARPX_DIM_RZ) || defined(WARPX_DIM_RCYLINDER)
amrex::Real const afup1 = area_factor(i+1,j,k);
amrex::Real const afdn1 = area_factor(i-1,j,k);
amrex::Real const afuphalf = 0.5_rt*(af + afup1);
amrex::Real const afdnhalf = 0.5_rt*(af + afdn1);
return af*T_Algo::EyBz(i,j,k,comp,Ey_arr,Bz_arr)
- (af == 0._rt ? 0.0_rt : Ez_arr(i,j,k,comp)*0.5_rt*(afdnhalf*By_arr(i-1,j,k,comp) + afuphalf*By_arr(i,j,k,comp)));
#else
return af*(T_Algo::EyBz(i,j,k,comp,Ey_arr,Bz_arr) - T_Algo::EzBy(i,j,k,comp,Ez_arr,By_arr));
#endif
}

else if constexpr (normal_dir == 1) {
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