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#include "WarpXBoostedFrameDiagnostic.H"
#include <AMReX_MultiFabUtil.H>
#include "WarpX_f.H"
using namespace amrex;
BoostedFrameDiagnostic::
BoostedFrameDiagnostic(Real zmin_lab, Real zmax_lab, Real v_window_lab,
Real dt_snapshots_lab, int N_snapshots,
Real gamma_boost, Real dt_boost,
int boost_direction)
: gamma_boost_(gamma_boost),
dt_snapshots_lab_(dt_snapshots_lab),
dt_boost_(dt_boost),
N_snapshots_(N_snapshots),
boost_direction_(boost_direction)
{
BL_PROFILE("BoostedFrameDiagnostic::BoostedFrameDiagnostic");
inv_gamma_boost_ = 1.0 / gamma_boost_;
beta_boost_ = std::sqrt(1.0 - inv_gamma_boost_*inv_gamma_boost_);
inv_beta_boost_ = 1.0 / beta_boost_;
dz_lab_ = PhysConst::c * dt_boost_ * inv_beta_boost_ * inv_gamma_boost_;
inv_dz_lab_ = 1.0 / dz_lab_;
Nz_lab_ = static_cast<int>((zmax_lab - zmin_lab) * inv_dz_lab_);
writeMetaData();
data_buffer_.resize(N_snapshots);
for (int i = 0; i < N_snapshots; ++i) {
Real t_lab = i * dt_snapshots_lab_;
LabSnapShot snapshot(t_lab, zmin_lab + v_window_lab * t_lab,
zmax_lab + v_window_lab * t_lab, i);
snapshots_.push_back(snapshot);
buff_counter_.push_back(0);
data_buffer_[i].reset( nullptr );
}
AMREX_ALWAYS_ASSERT(max_box_size_ >= num_buffer_);
}
void
BoostedFrameDiagnostic::
writeLabFrameData(const MultiFab& cell_centered_data, const Geometry& geom, Real t_boost) {
BL_PROFILE("BoostedFrameDiagnostic::writeLabFrameData");
VisMF::Header::Version current_version = VisMF::GetHeaderVersion();
VisMF::SetHeaderVersion(amrex::VisMF::Header::NoFabHeader_v1);
const RealBox& domain_z_boost = geom.ProbDomain();
const Real zlo_boost = domain_z_boost.lo(boost_direction_);
const Real zhi_boost = domain_z_boost.hi(boost_direction_);
for (int i = 0; i < N_snapshots_; ++i) {
snapshots_[i].updateCurrentZPositions(t_boost,
inv_gamma_boost_,
inv_beta_boost_);
if ( (snapshots_[i].current_z_boost < zlo_boost) or
(snapshots_[i].current_z_boost > zhi_boost) or
(snapshots_[i].current_z_lab < snapshots_[i].zmin_lab) or
(snapshots_[i].current_z_lab > snapshots_[i].zmax_lab) ) continue;
// for each z position, fill a slice with the data.
int i_lab = (snapshots_[i].current_z_lab - snapshots_[i].zmin_lab) / dz_lab_;
const int ncomp = cell_centered_data.nComp();
const int start_comp = 0;
std::unique_ptr<MultiFab> slice = amrex::get_slice_data(boost_direction_,
snapshots_[i].current_z_boost,
cell_centered_data, geom,
start_comp, ncomp);
// transform it to the lab frame
for (MFIter mfi(*slice); mfi.isValid(); ++mfi) {
const Box& tile_box = mfi.tilebox();
WRPX_LORENTZ_TRANSFORM_Z(BL_TO_FORTRAN_ANYD((*slice)[mfi]),
BL_TO_FORTRAN_BOX(tile_box),
&gamma_boost_, &beta_boost_);
}
if (buff_counter_[i] == 0) {
Box buff_box = geom.Domain();
buff_box.setSmall(boost_direction_, i_lab - num_buffer_ + 1);
buff_box.setBig(boost_direction_, i_lab);
BoxArray buff_ba(buff_box);
buff_ba.maxSize(max_box_size_);
DistributionMapping buff_dm(buff_ba);
data_buffer_[i].reset( new MultiFab(buff_ba, buff_dm, ncomp, 0) );
}
Real dx = geom.CellSize(boost_direction_);
int i_boost = (snapshots_[i].current_z_boost - geom.ProbLo(boost_direction_))/dx;
Box slice_box = geom.Domain();
slice_box.setSmall(boost_direction_, i_boost);
slice_box.setBig(boost_direction_, i_boost);
BoxArray slice_ba(slice_box);
slice_ba.maxSize(max_box_size_);
MultiFab tmp(slice_ba, data_buffer_[i]->DistributionMap(), ncomp, 0);
tmp.copy(*slice, 0, 0, ncomp);
#ifdef _OPENMP
#pragma omp parallel
#endif
for (MFIter mfi(tmp, true); mfi.isValid(); ++mfi) {
const Box& tile_box = mfi.tilebox();
WRPX_COPY_SLICE(BL_TO_FORTRAN_BOX(tile_box),
BL_TO_FORTRAN_ANYD(tmp[mfi]),
BL_TO_FORTRAN_ANYD((*data_buffer_[i])[mfi]),
&ncomp, &i_boost, &i_lab);
}
++buff_counter_[i];
if (buff_counter_[i] == num_buffer_) {
std::stringstream ss;
ss << snapshots_[i].file_name << "/Level_0/" << Concatenate("buffer", i_lab, 5);
VisMF::Write(*data_buffer_[i], ss.str());
buff_counter_[i] = 0;
}
}
VisMF::SetHeaderVersion(current_version);
}
void
BoostedFrameDiagnostic::
writeMetaData()
{
BL_PROFILE("BoostedFrameDiagnostic::writeMetaData");
if (ParallelDescriptor::IOProcessor()) {
std::string DiagnosticDirectory = "lab_frame_data";
if (!UtilCreateDirectory(DiagnosticDirectory, 0755))
CreateDirectoryFailed(DiagnosticDirectory);
std::string HeaderFileName(DiagnosticDirectory + "/Header");
std::ofstream HeaderFile(HeaderFileName.c_str(), std::ofstream::out |
std::ofstream::trunc |
std::ofstream::binary);
if(!HeaderFile.good())
FileOpenFailed(HeaderFileName);
HeaderFile.precision(17);
VisMF::IO_Buffer io_buffer(VisMF::IO_Buffer_Size);
HeaderFile.rdbuf()->pubsetbuf(io_buffer.dataPtr(), io_buffer.size());
HeaderFile << N_snapshots_ << "\n";
HeaderFile << dt_snapshots_lab_ << "\n";
HeaderFile << gamma_boost_ << "\n";
HeaderFile << beta_boost_ << "\n";
HeaderFile << dz_lab_ << "\n";
HeaderFile << Nz_lab_ << "\n";
}
}
BoostedFrameDiagnostic::LabSnapShot::
LabSnapShot(Real t_lab_in, Real zmin_lab_in,
Real zmax_lab_in, int file_num_in)
: t_lab(t_lab_in),
zmin_lab(zmin_lab_in),
zmax_lab(zmax_lab_in),
file_num(file_num_in)
{
current_z_lab = 0.0;
current_z_boost = 0.0;
file_name = Concatenate("lab_frame_data/snapshot", file_num, 5);
if (ParallelDescriptor::IOProcessor()) {
const int nlevels = 1;
const std::string level_prefix = "Level_";
if (!UtilCreateDirectory(file_name, 0755))
CreateDirectoryFailed(file_name);
for(int i(0); i < nlevels; ++i) {
const std::string &fullpath = LevelFullPath(i, file_name);
if (!UtilCreateDirectory(fullpath, 0755))
CreateDirectoryFailed(fullpath);
}
}
ParallelDescriptor::Barrier();
if (ParallelDescriptor::IOProcessor()) writeSnapShotHeader();
}
void
BoostedFrameDiagnostic::LabSnapShot::
updateCurrentZPositions(Real t_boost, Real inv_gamma, Real inv_beta) {
current_z_boost = (t_lab*inv_gamma - t_boost)*PhysConst::c*inv_beta;
current_z_lab = (t_lab - t_boost*inv_gamma)*PhysConst::c*inv_beta;
}
void
BoostedFrameDiagnostic::LabSnapShot::
writeSnapShotHeader() {
if (ParallelDescriptor::IOProcessor()) {
std::string HeaderFileName(file_name + "/Header");
std::ofstream HeaderFile(HeaderFileName.c_str(), std::ofstream::out |
std::ofstream::trunc |
std::ofstream::binary);
if(!HeaderFile.good())
FileOpenFailed(HeaderFileName);
HeaderFile.precision(17);
VisMF::IO_Buffer io_buffer(VisMF::IO_Buffer_Size);
HeaderFile.rdbuf()->pubsetbuf(io_buffer.dataPtr(), io_buffer.size());
HeaderFile << t_lab << "\n";
HeaderFile << zmin_lab << "\n";
HeaderFile << zmax_lab << "\n";
}
}
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