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/* Copyright 2020 Remi Lehe
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#include "FieldSolver/FiniteDifferenceSolver/FiniteDifferenceSolver.H"
#include "BoundaryConditions/PML.H"
#include "BoundaryConditions/PMLComponent.H"
#include "BoundaryConditions/PML_current.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/TextMsg.H"
#include "Utils/WarpXAlgorithmSelection.H"
#include "Utils/WarpXConst.H"
#include <AMReX.H>
#include <AMReX_Array4.H>
#include <AMReX_Config.H>
#include <AMReX_Extension.H>
#include <AMReX_FabArray.H>
#include <AMReX_GpuContainers.H>
#include <AMReX_GpuControl.H>
#include <AMReX_GpuLaunch.H>
#include <AMReX_GpuQualifiers.H>
#include <AMReX_IndexType.H>
#include <AMReX_MFIter.H>
#include <AMReX_MultiFab.H>
#include <AMReX_REAL.H>
#include <AMReX_BaseFwd.H>
#include <array>
using namespace amrex;
/**
* \brief Update the E field, over one timestep
*/
void FiniteDifferenceSolver::EvolveEPML (
std::array< amrex::MultiFab*, 3 > Efield,
std::array< amrex::MultiFab*, 3 > const Bfield,
std::array< amrex::MultiFab*, 3 > const Jfield,
std::array< amrex::MultiFab*, 3 > const edge_lengths,
amrex::MultiFab* const Ffield,
MultiSigmaBox const& sigba,
amrex::Real const dt, bool pml_has_particles ) {
// Select algorithm (The choice of algorithm is a runtime option,
// but we compile code for each algorithm, using templates)
#ifdef WARPX_DIM_RZ
amrex::ignore_unused(Efield, Bfield, Jfield, Ffield, sigba, dt, pml_has_particles, edge_lengths);
amrex::Abort(Utils::TextMsg::Err(
"PML are not implemented in cylindrical geometry."));
#else
if (m_grid_type == GridType::Collocated) {
EvolveEPMLCartesian <CartesianNodalAlgorithm> (
Efield, Bfield, Jfield, edge_lengths, Ffield, sigba, dt, pml_has_particles );
} else if (m_fdtd_algo == ElectromagneticSolverAlgo::Yee || m_fdtd_algo == ElectromagneticSolverAlgo::ECT) {
EvolveEPMLCartesian <CartesianYeeAlgorithm> (
Efield, Bfield, Jfield, edge_lengths, Ffield, sigba, dt, pml_has_particles );
} else if (m_fdtd_algo == ElectromagneticSolverAlgo::CKC) {
EvolveEPMLCartesian <CartesianCKCAlgorithm> (
Efield, Bfield, Jfield, edge_lengths, Ffield, sigba, dt, pml_has_particles );
} else {
amrex::Abort(Utils::TextMsg::Err("EvolveEPML: Unknown algorithm"));
}
#endif
}
#ifndef WARPX_DIM_RZ
template<typename T_Algo>
void FiniteDifferenceSolver::EvolveEPMLCartesian (
std::array< amrex::MultiFab*, 3 > Efield,
std::array< amrex::MultiFab*, 3 > const Bfield,
std::array< amrex::MultiFab*, 3 > const Jfield,
std::array< amrex::MultiFab*, 3 > const edge_lengths,
amrex::MultiFab* const Ffield,
MultiSigmaBox const& sigba,
amrex::Real const dt, bool pml_has_particles ) {
Real constexpr c2 = PhysConst::c * PhysConst::c;
// Loop through the grids, and over the tiles within each grid
#ifdef AMREX_USE_OMP
#pragma omp parallel if (amrex::Gpu::notInLaunchRegion())
#endif
for ( MFIter mfi(*Efield[0], TilingIfNotGPU()); mfi.isValid(); ++mfi ) {
// Extract field data for this grid/tile
Array4<Real> const& Ex = Efield[0]->array(mfi);
Array4<Real> const& Ey = Efield[1]->array(mfi);
Array4<Real> const& Ez = Efield[2]->array(mfi);
Array4<Real> const& Bx = Bfield[0]->array(mfi);
Array4<Real> const& By = Bfield[1]->array(mfi);
Array4<Real> const& Bz = Bfield[2]->array(mfi);
#ifdef AMREX_USE_EB
Array4<Real> const& lx = edge_lengths[0]->array(mfi);
Array4<Real> const& ly = edge_lengths[1]->array(mfi);
Array4<Real> const& lz = edge_lengths[2]->array(mfi);
#endif
// Extract stencil coefficients
Real const * const AMREX_RESTRICT coefs_x = m_stencil_coefs_x.dataPtr();
int const n_coefs_x = m_stencil_coefs_x.size();
Real const * const AMREX_RESTRICT coefs_y = m_stencil_coefs_y.dataPtr();
int const n_coefs_y = m_stencil_coefs_y.size();
Real const * const AMREX_RESTRICT coefs_z = m_stencil_coefs_z.dataPtr();
int const n_coefs_z = m_stencil_coefs_z.size();
// Extract tileboxes for which to loop
Box const& tex = mfi.tilebox(Efield[0]->ixType().ixType());
Box const& tey = mfi.tilebox(Efield[1]->ixType().ixType());
Box const& tez = mfi.tilebox(Efield[2]->ixType().ixType());
// Loop over the cells and update the fields
amrex::ParallelFor(tex, tey, tez,
[=] AMREX_GPU_DEVICE (int i, int j, int k){
#ifdef AMREX_USE_EB
if(lx(i, j, k) <= 0) return;
#endif
Ex(i, j, k, PMLComp::xz) -= c2 * dt * (
T_Algo::DownwardDz(By, coefs_z, n_coefs_z, i, j, k, PMLComp::yx)
+ T_Algo::DownwardDz(By, coefs_z, n_coefs_z, i, j, k, PMLComp::yz) );
Ex(i, j, k, PMLComp::xy) += c2 * dt * (
T_Algo::DownwardDy(Bz, coefs_y, n_coefs_y, i, j, k, PMLComp::zx)
+ T_Algo::DownwardDy(Bz, coefs_y, n_coefs_y, i, j, k, PMLComp::zy) );
},
[=] AMREX_GPU_DEVICE (int i, int j, int k){
#ifdef AMREX_USE_EB
// Skip field push if this cell is fully covered by embedded boundaries
#ifdef WARPX_DIM_3D
if (ly(i,j,k) <= 0) return;
#elif defined(WARPX_DIM_XZ)
//In XZ Ey is associated with a mesh node, so we need to check if the mesh node is covered
amrex::ignore_unused(ly);
if (lx(i, j, k)<=0 || lx(i-1, j, k)<=0 || lz(i, j-1, k)<=0 || lz(i, j, k)<=0) return;
#endif
#endif
Ey(i, j, k, PMLComp::yx) -= c2 * dt * (
T_Algo::DownwardDx(Bz, coefs_x, n_coefs_x, i, j, k, PMLComp::zx)
+ T_Algo::DownwardDx(Bz, coefs_x, n_coefs_x, i, j, k, PMLComp::zy) );
Ey(i, j, k, PMLComp::yz) += c2 * dt * (
T_Algo::DownwardDz(Bx, coefs_z, n_coefs_z, i, j, k, PMLComp::xy)
+ T_Algo::DownwardDz(Bx, coefs_z, n_coefs_z, i, j, k, PMLComp::xz) );
},
[=] AMREX_GPU_DEVICE (int i, int j, int k){
#ifdef AMREX_USE_EB
if(lz(i, j, k) <= 0) return;
#endif
Ez(i, j, k, PMLComp::zy) -= c2 * dt * (
T_Algo::DownwardDy(Bx, coefs_y, n_coefs_y, i, j, k, PMLComp::xy)
+ T_Algo::DownwardDy(Bx, coefs_y, n_coefs_y, i, j, k, PMLComp::xz) );
Ez(i, j, k, PMLComp::zx) += c2 * dt * (
T_Algo::DownwardDx(By, coefs_x, n_coefs_x, i, j, k, PMLComp::yx)
+ T_Algo::DownwardDx(By, coefs_x, n_coefs_x, i, j, k, PMLComp::yz) );
}
);
// If F is not a null pointer, further update E using the grad(F) term
// (hyperbolic correction for errors in charge conservation)
if (Ffield) {
// Extract field data for this grid/tile
Array4<Real> const& F = Ffield->array(mfi);
// Loop over the cells and update the fields
amrex::ParallelFor(tex, tey, tez,
[=] AMREX_GPU_DEVICE (int i, int j, int k){
Ex(i, j, k, PMLComp::xx) += c2 * dt * (
T_Algo::UpwardDx(F, coefs_x, n_coefs_x, i, j, k, PMLComp::x)
+ T_Algo::UpwardDx(F, coefs_x, n_coefs_x, i, j, k, PMLComp::y)
+ T_Algo::UpwardDx(F, coefs_x, n_coefs_x, i, j, k, PMLComp::z) );
},
[=] AMREX_GPU_DEVICE (int i, int j, int k){
Ey(i, j, k, PMLComp::yy) += c2 * dt * (
T_Algo::UpwardDy(F, coefs_y, n_coefs_y, i, j, k, PMLComp::x)
+ T_Algo::UpwardDy(F, coefs_y, n_coefs_y, i, j, k, PMLComp::y)
+ T_Algo::UpwardDy(F, coefs_y, n_coefs_y, i, j, k, PMLComp::z) );
},
[=] AMREX_GPU_DEVICE (int i, int j, int k){
Ez(i, j, k, PMLComp::zz) += c2 * dt * (
T_Algo::UpwardDz(F, coefs_z, n_coefs_z, i, j, k, PMLComp::x)
+ T_Algo::UpwardDz(F, coefs_z, n_coefs_z, i, j, k, PMLComp::y)
+ T_Algo::UpwardDz(F, coefs_z, n_coefs_z, i, j, k, PMLComp::z) );
}
);
}
// Update the E field in the PML, using the current
// deposited by the particles in the PML
if (pml_has_particles) {
// Extract field data for this grid/tile
Array4<Real> const& Jx = Jfield[0]->array(mfi);
Array4<Real> const& Jy = Jfield[1]->array(mfi);
Array4<Real> const& Jz = Jfield[2]->array(mfi);
const Real* sigmaj_x = sigba[mfi].sigma[0].data();
const Real* sigmaj_y = sigba[mfi].sigma[1].data();
const Real* sigmaj_z = sigba[mfi].sigma[2].data();
int const x_lo = sigba[mfi].sigma[0].lo();
#if defined(WARPX_DIM_3D)
int const y_lo = sigba[mfi].sigma[1].lo();
int const z_lo = sigba[mfi].sigma[2].lo();
#else
int const y_lo = 0;
int const z_lo = sigba[mfi].sigma[1].lo();
#endif
const Real mu_c2_dt = (PhysConst::mu0*PhysConst::c*PhysConst::c) * dt;
amrex::ParallelFor( tex, tey, tez,
[=] AMREX_GPU_DEVICE (int i, int j, int k) {
push_ex_pml_current(i, j, k, Ex, Jx,
sigmaj_y, sigmaj_z, y_lo, z_lo, mu_c2_dt);
},
[=] AMREX_GPU_DEVICE (int i, int j, int k) {
push_ey_pml_current(i, j, k, Ey, Jy,
sigmaj_x, sigmaj_z, x_lo, z_lo, mu_c2_dt);
},
[=] AMREX_GPU_DEVICE (int i, int j, int k) {
push_ez_pml_current(i, j, k, Ez, Jz,
sigmaj_x, sigmaj_y, x_lo, y_lo, mu_c2_dt);
}
);
}
}
#ifndef AMREX_USE_EB
amrex::ignore_unused(edge_lengths);
#endif
}
#endif // corresponds to ifndef WARPX_DIM_RZ
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