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/* Copyright 2019-2020
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#include "ParticleMomentum.H"
#include "Particles/MultiParticleContainer.H"
#include "Particles/SpeciesPhysicalProperties.H"
#include "Particles/WarpXParticleContainer.H"
#include "Utils/WarpXConst.H"
#include "WarpX.H"
#include <AMReX_GpuQualifiers.H>
#include <AMReX_PODVector.H>
#include <AMReX_ParallelDescriptor.H>
#include <AMReX_ParticleReduce.H>
#include <AMReX_Particles.H>
#include <AMReX_REAL.H>
#include <AMReX_Reduce.H>
#include <AMReX_Tuple.H>
#include <AMReX_Vector.H>
#include <algorithm>
#include <limits>
#include <map>
#include <ostream>
#include <string>
#include <vector>
using namespace amrex;
ParticleMomentum::ParticleMomentum (std::string rd_name)
: ReducedDiags{rd_name}
{
// Get a reference to WarpX instance
auto & warpx = WarpX::GetInstance();
// Get MultiParticleContainer class object
const auto & mypc = warpx.GetPartContainer();
// Get number of species
const int nSpecies = mypc.nSpecies();
// Resize data array
m_data.resize(6*nSpecies+6, 0.0_rt);
// Get species names
const std::vector<std::string> species_names = mypc.GetSpeciesNames();
if (ParallelDescriptor::IOProcessor())
{
if (m_IsNotRestart)
{
// Open file
std::ofstream ofs{m_path + m_rd_name + "." + m_extension, std::ofstream::out};
int c = 0;
// Write header row
ofs << "#";
ofs << "[" << c++ << "]step()";
ofs << m_sep;
ofs << "[" << c++ << "]time(s)";
ofs << m_sep;
ofs << "[" << c++ << "]total_x(kg*m/s)";
ofs << m_sep;
ofs << "[" << c++ << "]total_y(kg*m/s)";
ofs << m_sep;
ofs << "[" << c++ << "]total_z(kg*m/s)";
for (int i = 0; i < nSpecies; ++i)
{
ofs << m_sep;
ofs << "[" << c++ << "]";
ofs << species_names[i] + "_x(kg*m/s)";
ofs << m_sep;
ofs << "[" << c++ << "]";
ofs << species_names[i] + "_y(kg*m/s)";
ofs << m_sep;
ofs << "[" << c++ << "]";
ofs << species_names[i] + "_z(kg*m/s)";
}
ofs << m_sep;
ofs << "[" << c++ << "]";
ofs << "total_mean_x(kg*m/s)";
ofs << m_sep;
ofs << "[" << c++ << "]";
ofs << "total_mean_y(kg*m/s)";
ofs << m_sep;
ofs << "[" << c++ << "]";
ofs << "total_mean_z(kg*m/s)";
for (int i = 0; i < nSpecies; ++i)
{
ofs << m_sep;
ofs << "[" << c++ << "]";
ofs << species_names[i] + "_mean_x(kg*m/s)";
ofs << m_sep;
ofs << "[" << c++ << "]";
ofs << species_names[i] + "_mean_y(kg*m/s)";
ofs << m_sep;
ofs << "[" << c++ << "]";
ofs << species_names[i] + "_mean_z(kg*m/s)";
}
ofs << std::endl;
ofs.close();
}
}
}
void ParticleMomentum::ComputeDiags (int step)
{
// Check if the diags should be done
if (m_intervals.contains(step+1) == false)
{
return;
}
// Get MultiParticleContainer class object
const auto & mypc = WarpX::GetInstance().GetPartContainer();
// Get number of species
const int nSpecies = mypc.nSpecies();
// Some useful offsets to fill m_data below
int offset_total_species, offset_mean_species, offset_mean_all;
amrex::Real Wtot = 0.0_rt;
// Loop over species
for (int i_s = 0; i_s < nSpecies; ++i_s)
{
// Get WarpXParticleContainer class object
const auto & myspc = mypc.GetParticleContainer(i_s);
// Get mass
// (photons must be treated as a special case: they have zero mass,
// but ux, uy, uz are calculated assuming a mass equal to the electron mass)
const amrex::Real m = (myspc.AmIA<PhysicalSpecies::photon>()) ? PhysConst::m_e : myspc.getMass();
using PType = typename WarpXParticleContainer::SuperParticleType;
// Use amrex::ParticleReduce to compute the sum of the momenta and weights of all particles
// held by the current MPI rank for this species (loop over all boxes held by this MPI rank):
// the result r is the tuple (Px, Py, Pz, Ws)
amrex::ReduceOps<ReduceOpSum, ReduceOpSum, ReduceOpSum, ReduceOpSum> reduce_ops;
auto r = amrex::ParticleReduce<amrex::ReduceData<Real, Real, Real, Real>>(
myspc,
[=] AMREX_GPU_DEVICE(const PType& p) noexcept -> amrex::GpuTuple<Real, Real, Real, Real>
{
const amrex::Real w = p.rdata(PIdx::w);
const amrex::Real ux = p.rdata(PIdx::ux);
const amrex::Real uy = p.rdata(PIdx::uy);
const amrex::Real uz = p.rdata(PIdx::uz);
return {w*m*ux, w*m*uy, w*m*uz, w};
},
reduce_ops);
amrex::Real Px = amrex::get<0>(r);
amrex::Real Py = amrex::get<1>(r);
amrex::Real Pz = amrex::get<2>(r);
amrex::Real Ws = amrex::get<3>(r);
// Reduced sum over MPI ranks
ParallelDescriptor::ReduceRealSum(Px, ParallelDescriptor::IOProcessorNumber());
ParallelDescriptor::ReduceRealSum(Py, ParallelDescriptor::IOProcessorNumber());
ParallelDescriptor::ReduceRealSum(Pz, ParallelDescriptor::IOProcessorNumber());
ParallelDescriptor::ReduceRealSum(Ws, ParallelDescriptor::IOProcessorNumber());
// Accumulate sum of weights over all species (must come after MPI reduction of Ws)
Wtot += Ws;
// Save results for this species i_s into m_data
// Offset:
// 3 values of total momentum for all species +
// 3 values of total momentum for each species
offset_total_species = 3 + i_s*3;
m_data[offset_total_species+0] = Px;
m_data[offset_total_species+1] = Py;
m_data[offset_total_species+2] = Pz;
// Offset:
// 3 values of total momentum for all species +
// 3 values of total momentum for each species +
// 3 values of mean momentum for all species +
// 3 values of mean momentum for each species
offset_mean_species = 3 + nSpecies*3 + 3 + i_s*3;
if (Ws > std::numeric_limits<Real>::min())
{
m_data[offset_mean_species+0] = Px / Ws;
m_data[offset_mean_species+1] = Py / Ws;
m_data[offset_mean_species+2] = Pz / Ws;
}
else
{
m_data[offset_mean_species+0] = 0.0_rt;
m_data[offset_mean_species+1] = 0.0_rt;
m_data[offset_mean_species+2] = 0.0_rt;
}
}
// Total momentum
m_data[0] = 0.0_rt;
m_data[1] = 0.0_rt;
m_data[2] = 0.0_rt;
// Loop over species
for (int i_s = 0; i_s < nSpecies; ++i_s)
{
// Offset:
// 3 values of total momentum for all species +
// 3 values of total momentum for each species
offset_total_species = 3 + i_s*3;
m_data[0] += m_data[offset_total_species+0];
m_data[1] += m_data[offset_total_species+1];
m_data[2] += m_data[offset_total_species+2];
}
// Total mean momentum. Offset:
// 3 values of total momentum for all species +
// 3 values of total momentum for each species
offset_mean_all = 3 + nSpecies*3;
if (Wtot > std::numeric_limits<Real>::min())
{
m_data[offset_mean_all+0] = m_data[0] / Wtot;
m_data[offset_mean_all+1] = m_data[1] / Wtot;
m_data[offset_mean_all+2] = m_data[2] / Wtot;
}
else
{
m_data[offset_mean_all+0] = 0.0_rt;
m_data[offset_mean_all+1] = 0.0_rt;
m_data[offset_mean_all+2] = 0.0_rt;
}
// m_data contains up-to-date values for:
// [total momentum along x (all species)
// total momentum along y (all species)
// total momentum along z (all species)
// total momentum along x (species 1)
// total momentum along y (species 1)
// total momentum along z (species 1)
// ...
// total momentum along x (species n)
// total momentum along y (species n)
// total momentum along z (species n)
// mean momentum along x (all species)
// mean momentum along y (all species)
// mean momentum along z (all species)
// mean momentum along x (species 1)
// mean momentum along y (species 1)
// mean momentum along z (species 1)
// ...
// mean momentum along x (species n)
// mean momentum along y (species n)
// mean momentum along z (species n)]
}
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