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/* Copyright 2020 Remi Lehe
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#include "FiniteDifferenceSolver.H"
#ifndef WARPX_DIM_RZ
# include "FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CartesianYeeAlgorithm.H"
# include "FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CartesianCKCAlgorithm.H"
# include "FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CartesianNodalAlgorithm.H"
#else
# include "FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CylindricalYeeAlgorithm.H"
#endif
#include "Utils/WarpXAlgorithmSelection.H"
#ifdef WARPX_DIM_RZ
# include "WarpX.H"
#endif
#include <AMReX.H>
#include <AMReX_GpuDevice.H>
#include <AMReX_PODVector.H>
#include <AMReX_Vector.H>
#include <vector>
/* This function initializes the stencil coefficients for the chosen finite-difference algorithm */
FiniteDifferenceSolver::FiniteDifferenceSolver (
int const fdtd_algo,
std::array<amrex::Real,3> cell_size,
bool do_nodal ) {
// Register the type of finite-difference algorithm
m_fdtd_algo = fdtd_algo;
m_do_nodal = do_nodal;
// return if not FDTD
if (fdtd_algo == MaxwellSolverAlgo::PSATD)
return;
// Calculate coefficients of finite-difference stencil
#ifdef WARPX_DIM_RZ
m_dr = cell_size[0];
m_nmodes = WarpX::GetInstance().n_rz_azimuthal_modes;
m_rmin = WarpX::GetInstance().Geom(0).ProbLo(0);
if (fdtd_algo == MaxwellSolverAlgo::Yee) {
CylindricalYeeAlgorithm::InitializeStencilCoefficients( cell_size,
m_h_stencil_coefs_r, m_h_stencil_coefs_z );
m_stencil_coefs_r.resize(m_h_stencil_coefs_r.size());
m_stencil_coefs_z.resize(m_h_stencil_coefs_z.size());
amrex::Gpu::copyAsync(amrex::Gpu::hostToDevice,
m_h_stencil_coefs_r.begin(), m_h_stencil_coefs_r.end(),
m_stencil_coefs_r.begin());
amrex::Gpu::copyAsync(amrex::Gpu::hostToDevice,
m_h_stencil_coefs_z.begin(), m_h_stencil_coefs_z.end(),
m_stencil_coefs_z.begin());
amrex::Gpu::synchronize();
} else {
amrex::Abort("FiniteDifferenceSolver: Unknown algorithm");
}
#else
if (do_nodal) {
CartesianNodalAlgorithm::InitializeStencilCoefficients( cell_size,
m_h_stencil_coefs_x, m_h_stencil_coefs_y, m_h_stencil_coefs_z );
} else if (fdtd_algo == MaxwellSolverAlgo::Yee) {
CartesianYeeAlgorithm::InitializeStencilCoefficients( cell_size,
m_h_stencil_coefs_x, m_h_stencil_coefs_y, m_h_stencil_coefs_z );
} else if (fdtd_algo == MaxwellSolverAlgo::CKC) {
CartesianCKCAlgorithm::InitializeStencilCoefficients( cell_size,
m_h_stencil_coefs_x, m_h_stencil_coefs_y, m_h_stencil_coefs_z );
} else {
amrex::Abort("FiniteDifferenceSolver: Unknown algorithm");
}
m_stencil_coefs_x.resize(m_h_stencil_coefs_x.size());
m_stencil_coefs_y.resize(m_h_stencil_coefs_y.size());
m_stencil_coefs_z.resize(m_h_stencil_coefs_z.size());
amrex::Gpu::copyAsync(amrex::Gpu::hostToDevice,
m_h_stencil_coefs_x.begin(), m_h_stencil_coefs_x.end(),
m_stencil_coefs_x.begin());
amrex::Gpu::copyAsync(amrex::Gpu::hostToDevice,
m_h_stencil_coefs_y.begin(), m_h_stencil_coefs_y.end(),
m_stencil_coefs_y.begin());
amrex::Gpu::copyAsync(amrex::Gpu::hostToDevice,
m_h_stencil_coefs_z.begin(), m_h_stencil_coefs_z.end(),
m_stencil_coefs_z.begin());
amrex::Gpu::synchronize();
#endif
}
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