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/* Copyright 2019 Remi Lehe
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#include "SpectralKSpace.H"
#include "SpectralSolver.H"
#include "SpectralAlgorithms/PsatdAlgorithm.H"
#include "SpectralAlgorithms/PMLPsatdAlgorithm.H"
#include "SpectralAlgorithms/ComovingPsatdAlgorithm.H"
#include "WarpX.H"
#include "Utils/WarpXProfilerWrapper.H"
#include "Utils/WarpXUtil.H"
#include <memory>
#if WARPX_USE_PSATD
/* \brief Initialize the spectral Maxwell solver
*
* This function selects the spectral algorithm to be used, allocates the
* corresponding coefficients for the discretized field update equation,
* and prepares the structures that store the fields in spectral space.
*
* \param norder_x Order of accuracy of the spatial derivatives along x
* \param norder_y Order of accuracy of the spatial derivatives along y
* \param norder_z Order of accuracy of the spatial derivatives along z
* \param nodal Whether the solver is applied to a nodal or staggered grid
* \param dx Cell size along each dimension
* \param dt Time step
* \param pml Whether the boxes in which the solver is applied are PML boxes
* \param periodic_single_box Whether the full simulation domain consists of a single periodic box (i.e. the global domain is not MPI parallelized)
*/
SpectralSolver::SpectralSolver(
const int lev,
const amrex::BoxArray& realspace_ba,
const amrex::DistributionMapping& dm,
const int norder_x, const int norder_y,
const int norder_z, const bool nodal,
const amrex::Array<amrex::Real,3>& v_galilean,
const amrex::Array<amrex::Real,3>& v_comoving,
const amrex::RealVect dx, const amrex::Real dt,
const bool pml, const bool periodic_single_box,
const bool update_with_rho,
const bool fft_do_time_averaging) {
// Initialize all structures using the same distribution mapping dm
// - Initialize k space object (Contains info about the size of
// the spectral space corresponding to each box in `realspace_ba`,
// as well as the value of the corresponding k coordinates)
const SpectralKSpace k_space= SpectralKSpace(realspace_ba, dm, dx);
// - Select the algorithm depending on the input parameters
// Initialize the corresponding coefficients over k space
if (pml) {
algorithm = std::make_unique<PMLPsatdAlgorithm>(
k_space, dm, norder_x, norder_y, norder_z, nodal, dt);
}
else {
// Comoving PSATD algorithm
if (v_comoving[0] != 0. || v_comoving[1] != 0. || v_comoving[2] != 0.) {
algorithm = std::make_unique<ComovingPsatdAlgorithm>(
k_space, dm, norder_x, norder_y, norder_z, nodal, v_comoving, dt, update_with_rho);
}
// PSATD algorithms: standard, Galilean, or averaged Galilean
else {
algorithm = std::make_unique<PsatdAlgorithm>(
k_space, dm, norder_x, norder_y, norder_z, nodal, v_galilean, dt, update_with_rho, fft_do_time_averaging);
}
}
// - Initialize arrays for fields in spectral space + FFT plans
field_data = SpectralFieldData( lev, realspace_ba, k_space, dm,
algorithm->getRequiredNumberOfFields(), periodic_single_box);
}
void
SpectralSolver::ForwardTransform( const int lev,
const amrex::MultiFab& mf,
const int field_index,
const int i_comp )
{
WARPX_PROFILE("SpectralSolver::ForwardTransform");
field_data.ForwardTransform( lev, mf, field_index, i_comp );
}
void
SpectralSolver::BackwardTransform( const int lev,
amrex::MultiFab& mf,
const int field_index,
const int i_comp )
{
WARPX_PROFILE("SpectralSolver::BackwardTransform");
field_data.BackwardTransform( lev, mf, field_index, i_comp );
}
void
SpectralSolver::pushSpectralFields(){
WARPX_PROFILE("SpectralSolver::pushSpectralFields");
// Virtual function: the actual function used here depends
// on the sub-class of `SpectralBaseAlgorithm` that was
// initialized in the constructor of `SpectralSolver`
algorithm->pushSpectralFields( field_data );
}
#endif // WARPX_USE_PSATD
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