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/* Copyright 2019-2020 Yinjian Zhao
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#include "FieldEnergy.H"
#include "WarpX.H"
#include "WarpXConst.H"
#include "AMReX_REAL.H"
#include "AMReX_ParticleReduce.H"
#include <iostream>
#include <cmath>
using namespace amrex;
// constructor
FieldEnergy::FieldEnergy (std::string rd_name)
: ReducedDiags{rd_name}
{
// RZ coordinate is not working
#if (defined WARPX_DIM_RZ)
AMREX_ALWAYS_ASSERT_WITH_MESSAGE(false,
"FieldEnergy reduced diagnostics does not work for RZ coordinate.");
#endif
// get WarpX class object
auto & warpx = WarpX::GetInstance();
// read number of levels
int nLevel = 0;
ParmParse pp("amr");
pp.query("max_level", nLevel);
nLevel += 1;
// resize data array
m_data.resize(3*nLevel,0.0);
if (ParallelDescriptor::IOProcessor())
{
if ( m_IsNotRestart )
{
// open file
std::ofstream ofs;
ofs.open(m_path + m_rd_name + "." + m_extension,
std::ofstream::out | std::ofstream::app);
// write header row
ofs << "#";
ofs << "[1]step";
ofs << m_sep;
ofs << "[2]time(s)";
for (int lev = 0; lev < nLevel; ++lev)
{
ofs << m_sep;
ofs << "[" + std::to_string(3+3*lev) + "]";
ofs << "total(J)lev"+std::to_string(lev);
ofs << m_sep;
ofs << "[" + std::to_string(4+3*lev) + "]";
ofs << "E(J)lev"+std::to_string(lev);
ofs << m_sep;
ofs << "[" + std::to_string(5+3*lev) + "]";
ofs << "B(J)lev"+std::to_string(lev);
}
ofs << std::endl;
// close file
ofs.close();
}
}
}
// end constructor
// function that computes field energy
void FieldEnergy::ComputeDiags (int step)
{
// Judge if the diags should be done
if ( (step+1) % m_freq != 0 ) { return; }
// get WarpX class object
auto & warpx = WarpX::GetInstance();
// get number of level
auto nLevel = warpx.finestLevel() + 1;
// loop over refinement levels
for (int lev = 0; lev < nLevel; ++lev)
{
// get MultiFab data at lev
const MultiFab & Ex = warpx.getEfield(lev,0);
const MultiFab & Ey = warpx.getEfield(lev,1);
const MultiFab & Ez = warpx.getEfield(lev,2);
const MultiFab & Bx = warpx.getBfield(lev,0);
const MultiFab & By = warpx.getBfield(lev,1);
const MultiFab & Bz = warpx.getBfield(lev,2);
// get cell size
Geometry const & geom = warpx.Geom(lev);
auto domain_box = geom.Domain();
#if (AMREX_SPACEDIM == 2)
auto dV = geom.CellSize(0) * geom.CellSize(1);
#elif (AMREX_SPACEDIM == 3)
auto dV = geom.CellSize(0) * geom.CellSize(1) * geom.CellSize(2);
#endif
// compute E squared
Real tmpx = Ex.norm2(0,geom.periodicity());
Real tmpy = Ey.norm2(0,geom.periodicity());
Real tmpz = Ez.norm2(0,geom.periodicity());
Real Es = tmpx*tmpx + tmpy*tmpy + tmpz*tmpz;
// compute B squared
tmpx = Bx.norm2(0,geom.periodicity());
tmpy = By.norm2(0,geom.periodicity());
tmpz = Bz.norm2(0,geom.periodicity());
Real Bs = tmpx*tmpx + tmpy*tmpy + tmpz*tmpz;
// save data
m_data[lev*3+1] = 0.5 * Es * PhysConst::ep0 * dV;
m_data[lev*3+2] = 0.5 * Bs / PhysConst::mu0 * dV;
m_data[lev*3+0] = m_data[lev*3+1] + m_data[lev*3+2];
}
// end loop over refinement levels
/* m_data now contains up-to-date values for:
* [total field energy at level 0,
* electric field energy at level 0,
* magnetic field energy at level 0,
* total field energy at level 1,
* electric field energy at level 1,
* magnetic field energy at level 1,
* ......] */
}
// end void FieldEnergy::ComputeDiags
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