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/* Copyright 2021 Revathi Jambunathan
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#include "BackTransformParticleFunctor.H"
#include "Particles/Pusher/GetAndSetPosition.H"
#include "Particles/WarpXParticleContainer.H"
#include "Utils/WarpXConst.H"
#include "WarpX.H"
#include <AMReX.H>
#include <AMReX_Print.H>
#include <AMReX_BaseFwd.H>
SelectParticles::SelectParticles (const WarpXParIter& a_pti, TmpParticles& tmp_particle_data,
amrex::Real current_z_boost, amrex::Real old_z_boost,
int a_offset)
: m_current_z_boost(current_z_boost), m_old_z_boost(old_z_boost)
{
m_get_position = GetParticlePosition(a_pti, a_offset);
const auto lev = a_pti.GetLevel();
const auto index = a_pti.GetPairIndex();
zpold = tmp_particle_data[lev][index][TmpIdx::zold].dataPtr();
}
LorentzTransformParticles::LorentzTransformParticles ( const WarpXParIter& a_pti,
TmpParticles& tmp_particle_data,
amrex::Real t_boost, amrex::Real dt,
amrex::Real t_lab, int a_offset)
: m_t_boost(t_boost), m_dt(dt), m_t_lab(t_lab)
{
using namespace amrex::literals;
if (tmp_particle_data.size() == 0) return;
m_get_position = GetParticlePosition(a_pti, a_offset);
auto& attribs = a_pti.GetAttribs();
m_wpnew = attribs[PIdx::w].dataPtr();
m_uxpnew = attribs[PIdx::ux].dataPtr();
m_uypnew = attribs[PIdx::uy].dataPtr();
m_uzpnew = attribs[PIdx::uz].dataPtr();
const auto lev = a_pti.GetLevel();
const auto index = a_pti.GetPairIndex();
m_xpold = tmp_particle_data[lev][index][TmpIdx::xold].dataPtr();
m_ypold = tmp_particle_data[lev][index][TmpIdx::yold].dataPtr();
m_zpold = tmp_particle_data[lev][index][TmpIdx::zold].dataPtr();
m_uxpold = tmp_particle_data[lev][index][TmpIdx::uxold].dataPtr();
m_uypold = tmp_particle_data[lev][index][TmpIdx::uyold].dataPtr();
m_uzpold = tmp_particle_data[lev][index][TmpIdx::uzold].dataPtr();
m_betaboost = WarpX::beta_boost;
m_gammaboost = WarpX::gamma_boost;
m_Phys_c = PhysConst::c;
m_inv_c2 = 1._rt/(m_Phys_c * m_Phys_c);
m_uzfrm = -m_gammaboost*m_betaboost*m_Phys_c;
}
/**
* \brief Functor to compute Lorentz Transform and store the selected particles in existing
* particle buffers
*/
BackTransformParticleFunctor::BackTransformParticleFunctor (
WarpXParticleContainer *pc_src,
std::string species_name,
int num_buffers)
: m_pc_src{pc_src}, m_species_name{std::move(species_name)}, m_num_buffers{num_buffers}
{
InitData();
}
void
BackTransformParticleFunctor::operator () (PinnedMemoryParticleContainer& pc_dst, int &totalParticleCounter, int i_buffer) const
{
if (m_perform_backtransform[i_buffer] == 0) return;
auto &warpx = WarpX::GetInstance();
// get particle slice
const int nlevs = std::max(0, m_pc_src->finestLevel()+1);
auto tmp_particle_data = m_pc_src->getTmpParticleData();
for (int lev = 0; lev < nlevs; ++lev) {
const amrex::Real t_boost = warpx.gett_new(0);
const amrex::Real dt = warpx.getdt(0);
for (WarpXParIter pti(*m_pc_src, lev); pti.isValid(); ++pti) {
auto ptile_dst = pc_dst.DefineAndReturnParticleTile(lev, pti.index(), pti.LocalTileIndex() );
}
auto& particles = m_pc_src->GetParticles(lev);
#ifdef AMREX_USE_OMP
#pragma omp parallel
#endif
{
// Temporary arrays to store copy_flag and copy_index for particles
// that cross the z-slice
amrex::Gpu::DeviceVector<int> FlagForPartCopy;
amrex::Gpu::DeviceVector<int> IndexForPartCopy;
for (WarpXParIter pti(*m_pc_src, lev); pti.isValid(); ++pti) {
auto index = std::make_pair(pti.index(), pti.LocalTileIndex());
const auto GetParticleFilter = SelectParticles(pti, tmp_particle_data,
m_current_z_boost[i_buffer],
m_old_z_boost[i_buffer]);
const auto GetParticleLorentzTransform = LorentzTransformParticles(
pti, tmp_particle_data,
t_boost, dt,
m_t_lab[i_buffer]);
long const np = pti.numParticles();
FlagForPartCopy.resize(np);
IndexForPartCopy.resize(np);
int* const AMREX_RESTRICT Flag = FlagForPartCopy.dataPtr();
int* const AMREX_RESTRICT IndexLocation = IndexForPartCopy.dataPtr();
const auto& ptile_src = particles.at(index);
auto src_data = ptile_src.getConstParticleTileData();
// Flag particles that need to be copied if they cross the z-slice
// setting this to 1 for testing (temporarily)
amrex::ParallelFor(np,
[=] AMREX_GPU_DEVICE(int i)
{
Flag[i] = GetParticleFilter(src_data, i);
});
const int total_partdiag_size = amrex::Scan::ExclusiveSum(np,Flag,IndexLocation);
auto& ptile_dst = pc_dst.DefineAndReturnParticleTile(lev, pti.index(), pti.LocalTileIndex() );
auto old_size = ptile_dst.numParticles();
ptile_dst.resize(old_size + total_partdiag_size);
amrex::filterParticles(ptile_dst, ptile_src, GetParticleFilter, 0, old_size, np);
auto dst_data = ptile_dst.getParticleTileData();
amrex::ParallelFor(np,
[=] AMREX_GPU_DEVICE(int i)
{
if (Flag[i] == 1) GetParticleLorentzTransform(dst_data, src_data, i,
old_size + IndexLocation[i]);
});
amrex::Gpu::synchronize();
}
}
}
totalParticleCounter = pc_dst.TotalNumberOfParticles();
}
void
BackTransformParticleFunctor::InitData()
{
m_current_z_boost.resize(m_num_buffers);
m_old_z_boost.resize(m_num_buffers);
m_t_lab.resize(m_num_buffers);
m_perform_backtransform.resize(m_num_buffers);
}
void
BackTransformParticleFunctor::PrepareFunctorData ( int i_buffer, bool z_slice_in_domain,
amrex::Real old_z_boost, amrex::Real current_z_boost,
amrex::Real t_lab, int snapshot_full)
{
m_old_z_boost.at(i_buffer) = old_z_boost;
m_current_z_boost.at(i_buffer) = current_z_boost;
m_t_lab.at(i_buffer) = t_lab;
m_perform_backtransform.at(i_buffer) = 0;
if (z_slice_in_domain && (snapshot_full == 0)) m_perform_backtransform.at(i_buffer) = 1;
}
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