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/* Copyright 2019-2021 Luca Fedeli, Yinjian Zhao
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#include "ParticleEnergy.H"
#include "Diagnostics/ReducedDiags/ReducedDiags.H"
#include "Particles/Algorithms/KineticEnergy.H"
#include "Particles/MultiParticleContainer.H"
#include "Particles/SpeciesPhysicalProperties.H"
#include "Particles/WarpXParticleContainer.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 <cmath>
#include <fstream>
#include <limits>
#include <map>
#include <vector>
using namespace amrex;
// constructor
ParticleEnergy::ParticleEnergy (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 (int)
const auto nSpecies = mypc.nSpecies();
// resize data array
m_data.resize(2*nSpecies+2, 0.0_rt);
// get species names (std::vector<std::string>)
const auto 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};
// write header row
int c = 0;
ofs << "#";
ofs << "[" << c++ << "]step()";
ofs << m_sep;
ofs << "[" << c++ << "]time(s)";
ofs << m_sep;
ofs << "[" << c++ << "]total(J)";
for (int i = 0; i < nSpecies; ++i)
{
ofs << m_sep;
ofs << "[" << c++ << "]" << species_names[i] + "(J)";
}
ofs << m_sep;
ofs << "[" << c++ << "]total_mean(J)";
for (int i = 0; i < nSpecies; ++i)
{
ofs << m_sep;
ofs << "[" << c++ << "]" << species_names[i] + "_mean(J)";
}
ofs << std::endl;
// close file
ofs.close();
}
}
}
void ParticleEnergy::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 (used only for particles other than photons, see below)
amrex::Real m = myspc.getMass();
using PType = typename WarpXParticleContainer::SuperParticleType;
amrex::Real Etot = 0.0_rt;
amrex::Real Ws = 0.0_rt;
// Use amrex::ParticleReduce to compute the sum of energies 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 (Etot, Ws)
amrex::ReduceOps<ReduceOpSum, ReduceOpSum> reduce_ops;
if(myspc.AmIA<PhysicalSpecies::photon>())
{
auto r = amrex::ParticleReduce<amrex::ReduceData<Real, Real>>(
myspc,
[=] AMREX_GPU_DEVICE(const PType& p) noexcept -> amrex::GpuTuple<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*Algorithms::KineticEnergyPhotons(ux,uy,uz),w};
},
reduce_ops);
Etot = amrex::get<0>(r);
Ws = amrex::get<1>(r);
}
else // particle other than photons
{
auto r = amrex::ParticleReduce<amrex::ReduceData<Real, Real>>(
myspc,
[=] AMREX_GPU_DEVICE(const PType& p) noexcept -> amrex::GpuTuple<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*Algorithms::KineticEnergy(ux,uy,uz,m), w};
},
reduce_ops);
Etot = amrex::get<0>(r);
Ws = amrex::get<1>(r);
}
// Reduced sum over MPI ranks
ParallelDescriptor::ReduceRealSum(Etot, 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:
// 1 value of total energy for all species +
// 1 value of total energy for each species
offset_total_species = 1 + i_s;
m_data[offset_total_species] = Etot;
// Offset:
// 1 value of total energy for all species +
// 1 value of total energy for each species +
// 1 value of mean energy for all species +
// 1 value of mean energy for each species
offset_mean_species = 1 + nSpecies + 1 + i_s;
if (Ws > std::numeric_limits<Real>::min())
{
m_data[offset_mean_species] = Etot / Ws;
}
else
{
m_data[offset_mean_species] = 0.0_rt;
}
}
// Total energy
m_data[0] = 0.0_rt;
// Loop over species
for (int i_s = 0; i_s < nSpecies; ++i_s)
{
// Offset:
// 1 value of total energy for all species +
// 1 value of total energy for each species
offset_total_species = 1 + i_s;
m_data[0] += m_data[offset_total_species];
}
// Total mean energy. Offset:
// 1 value of total energy for all species +
// 1 value of total energy for each species
offset_mean_all = 1 + nSpecies;
if (Wtot > std::numeric_limits<Real>::min())
{
m_data[offset_mean_all] = m_data[0] / Wtot;
}
else
{
m_data[offset_mean_all] = 0.0_rt;
}
// m_data now contains up-to-date values for:
// [total energy (all species)
// total energy (species 1)
// ...
// total energy (species n)
// mean energy (all species)
// mean energy (species 1)
// ...
// mean energy (species n)]
}
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