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#include "DivBFunctor.H"
#include "Utils/CoarsenIO.H"
#include "WarpX.H"
#include <AMReX_IntVect.H>
#include <AMReX_MultiFab.H>
DivBFunctor::DivBFunctor(const std::array<const amrex::MultiFab* const, 3> arr_mf_src, const int lev, const amrex::IntVect crse_ratio,
bool convertRZmodes2cartesian, const int ncomp)
: ComputeDiagFunctor(ncomp, crse_ratio), m_arr_mf_src(arr_mf_src), m_lev(lev),
m_convertRZmodes2cartesian(convertRZmodes2cartesian)
{}
void
DivBFunctor::operator()(amrex::MultiFab& mf_dst, int dcomp, const int /*i_buffer*/) const
{
auto& warpx = WarpX::GetInstance();
// Guard cell is set to 1 for generality. However, for a cell-centered
// output Multifab, mf_dst, the guard-cell data is not needed especially considering
// the operations performend in the CoarsenAndInterpolate function.
constexpr int ng = 1;
// A cell-centered divB multifab spanning the entire domain is generated
// and divB is computed on the cell-center, with ng=1.
amrex::MultiFab divB( warpx.boxArray(m_lev), warpx.DistributionMap(m_lev), warpx.ncomps, ng );
warpx.ComputeDivB(divB, 0, m_arr_mf_src, WarpX::CellSize(m_lev) );
// // Coarsen and Interpolate from divB to coarsened/reduced_domain mf_dst
// CoarsenIO::Coarsen( mf_dst, divB, dcomp, 0, nComp(), 0, m_crse_ratio);
#ifdef WARPX_DIM_RZ
if (m_convertRZmodes2cartesian) {
// In cylindrical geometry, sum real part of all modes of divE in
// temporary multifab mf_dst_stag, and cell-center it to mf_dst.
AMREX_ALWAYS_ASSERT_WITH_MESSAGE(
nComp()==1,
"The RZ averaging over modes must write into 1 single component");
amrex::MultiFab mf_dst_stag(divB.boxArray(), warpx.DistributionMap(m_lev), 1, divB.nGrowVect());
// Mode 0
amrex::MultiFab::Copy(mf_dst_stag, divB, 0, 0, 1, divB.nGrowVect());
for (int ic=1 ; ic < divB.nComp() ; ic += 2) {
// Real part of all modes > 0
amrex::MultiFab::Add(mf_dst_stag, divB, ic, 0, 1, divB.nGrowVect());
}
// TODO check if coarsening is needed, otherwise copy
CoarsenIO::Coarsen( mf_dst, mf_dst_stag, dcomp, 0, nComp(), 0, m_crse_ratio);
} else {
// TODO check if coarsening is needed, otherwise copy
CoarsenIO::Coarsen( mf_dst, divB, dcomp, 0, nComp(), 0, m_crse_ratio);
}
#else
// In cartesian geometry, coarsen and interpolate from simulation MultiFab, divE,
// to output diagnostic MultiFab, mf_dst.
CoarsenIO::Coarsen( mf_dst, divB, dcomp, 0, nComp(), 0, m_crse_ratio);
amrex::ignore_unused(m_convertRZmodes2cartesian);
#endif
}
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