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/* Copyright 2019-2020 Andrew Myers, Axel Huebl, David Grote, Maxence Thevenet,
* Remi Lehe, Revathi Jambunathan, Weiqun Zhang, Edoardo Zoni
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#include "FieldIO.H"
#include "WarpX.H"
#include "Utils/CoarsenIO.H"
#include "Utils/WarpXUtil.H"
#ifdef WARPX_USE_PSATD
# include "FieldSolver/SpectralSolver/SpectralSolver.H"
#endif
#ifdef WARPX_USE_OPENPMD
# include <openPMD/openPMD.hpp>
#endif
using namespace amrex;
/** \brief
* Convert an IntVect to a std::vector<std::uint64_t>
* and reverse the order of the elements
* (used for compatibility with the openPMD API)
*/
std::vector<std::uint64_t>
getReversedVec( const IntVect& v )
{
// Convert the IntVect v to and std::vector u
std::vector<std::uint64_t> u = {
AMREX_D_DECL(
static_cast<std::uint64_t>(v[0]),
static_cast<std::uint64_t>(v[1]),
static_cast<std::uint64_t>(v[2])
)
};
// Reverse the order of elements, if v corresponds to the indices of a
// Fortran-order array (like an AMReX FArrayBox)
// but u is intended to be used with a C-order API (like openPMD)
std::reverse( u.begin(), u.end() );
return u;
}
/** \brief
* Convert Real* pointer to a std::vector<double>,
* and reverse the order of the elements
* (used for compatibility with the openPMD API)
*/
std::vector<double>
getReversedVec( const Real* v )
{
// Convert Real* v to and std::vector u
std::vector<double> u = {
AMREX_D_DECL(
static_cast<double>(v[0]),
static_cast<double>(v[1]),
static_cast<double>(v[2])
)
};
// Reverse the order of elements, if v corresponds to the indices of a
// Fortran-order array (like an AMReX FArrayBox)
// but u is intended to be used with a C-order API (like openPMD)
std::reverse( u.begin(), u.end() );
return u;
}
#ifdef WARPX_DIM_RZ
void
ConstructTotalRZVectorField (const std::array< std::unique_ptr<MultiFab>, 3 >& vector_total,
const std::array< std::unique_ptr<MultiFab>, 3 >& vector_field)
{
// Sum over the real components, giving quantity at theta=0
MultiFab::Copy(*vector_total[0], *vector_field[0], 0, 0, 1, vector_field[0]->nGrowVect());
MultiFab::Copy(*vector_total[1], *vector_field[1], 0, 0, 1, vector_field[1]->nGrowVect());
MultiFab::Copy(*vector_total[2], *vector_field[2], 0, 0, 1, vector_field[2]->nGrowVect());
for (int ic=1 ; ic < vector_field[0]->nComp() ; ic += 2) {
MultiFab::Add(*vector_total[0], *vector_field[0], ic, 0, 1, vector_field[0]->nGrowVect());
MultiFab::Add(*vector_total[1], *vector_field[1], ic, 0, 1, vector_field[1]->nGrowVect());
MultiFab::Add(*vector_total[2], *vector_field[2], ic, 0, 1, vector_field[2]->nGrowVect());
}
}
void
ConstructTotalRZScalarField (MultiFab& scalar_total,
const MultiFab& scalar_field)
{
// Sum over the real components, giving quantity at theta=0
MultiFab::Copy(scalar_total, scalar_field, 0, 0, 1, scalar_field.nGrowVect());
for (int ic=1 ; ic < scalar_field.nComp() ; ic += 2) {
MultiFab::Add(scalar_total, scalar_field, ic, 0, 1, scalar_field.nGrowVect());
}
}
#endif
/** \brief Takes an array of 3 MultiFab `vector_field`
* (representing the x, y, z components of a vector),
* averages it to the cell center, and stores the
* resulting MultiFab in mf_avg (in the components dcomp to dcomp+2)
* Should only be used for BTD now.
*/
void
AverageAndPackVectorField( MultiFab& mf_avg,
const std::array< std::unique_ptr<MultiFab>, 3 >& vector_field,
const DistributionMapping& dm,
const int dcomp, const int ngrow )
{
#ifndef WARPX_DIM_RZ
(void)dm;
#endif
#ifdef WARPX_DIM_RZ
// Note that vector_total is declared in the same way as
// vector_field so that it can be handled the same way.
std::array<std::unique_ptr<MultiFab>,3> vector_total;
if (vector_field[0]->nComp() > 1) {
// With the RZ solver, if there are more than one component, the total
// fields needs to be constructed in temporary MultiFabs.
vector_total[0].reset(new MultiFab(vector_field[0]->boxArray(), dm, 1, vector_field[0]->nGrowVect()));
vector_total[1].reset(new MultiFab(vector_field[1]->boxArray(), dm, 1, vector_field[1]->nGrowVect()));
vector_total[2].reset(new MultiFab(vector_field[2]->boxArray(), dm, 1, vector_field[2]->nGrowVect()));
ConstructTotalRZVectorField(vector_total, vector_field);
} else {
// Create aliases of the MultiFabs
vector_total[0].reset(new MultiFab(*vector_field[0], amrex::make_alias, 0, 1));
vector_total[1].reset(new MultiFab(*vector_field[1], amrex::make_alias, 0, 1));
vector_total[2].reset(new MultiFab(*vector_field[2], amrex::make_alias, 0, 1));
}
#else
const std::array<std::unique_ptr<MultiFab>,3> &vector_total = vector_field;
#endif
CoarsenIO::Coarsen( mf_avg, *(vector_total[0]), dcomp , 0, 1, ngrow );
CoarsenIO::Coarsen( mf_avg, *(vector_total[1]), dcomp+1, 0, 1, ngrow );
CoarsenIO::Coarsen( mf_avg, *(vector_total[2]), dcomp+2, 0, 1, ngrow );
}
/** \brief Take a MultiFab `scalar_field`
* averages it to the cell center, and stores the
* resulting MultiFab in mf_avg (in the components dcomp)
*/
void
AverageAndPackScalarField (MultiFab& mf_avg,
const MultiFab & scalar_field,
const DistributionMapping& dm,
const int dcomp, const int ngrow )
{
#ifdef WARPX_DIM_RZ
MultiFab *scalar_total;
if (scalar_field.nComp() > 1) {
// With the RZ solver, there are more than one component, so the total
// fields needs to be constructed in temporary a MultiFab.
scalar_total = new MultiFab(scalar_field.boxArray(), dm, 1, scalar_field.nGrowVect());
ConstructTotalRZScalarField(*scalar_total, scalar_field);
} else {
scalar_total = new MultiFab(scalar_field, amrex::make_alias, 0, 1);
}
#else
const MultiFab *scalar_total = &scalar_field;
#endif
// Check the type of staggering of the 3-component `vector_field`
// and average accordingly:
// - Fully cell-centered field (no average needed; simply copy)
if ( scalar_total->is_cell_centered() ){
MultiFab::Copy( mf_avg, *scalar_total, 0, dcomp, 1, ngrow);
} else if ( scalar_total->is_nodal() ){
// - Fully nodal
CoarsenIO::Coarsen( mf_avg, *scalar_total, dcomp, 0, 1, ngrow );
} else {
amrex::Abort("Unknown staggering.");
}
}
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