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#include "PlasmaInjector.H"
#include <sstream>
#include <WarpXConst.H>
#include <AMReX.H>
using namespace amrex;
namespace {
void StringParseAbortMessage(const std::string& var,
const std::string& name) {
std::stringstream stringstream;
std::string string;
stringstream << var << " string '" << name << "' not recognized.";
string = stringstream.str();
amrex::Abort(string.c_str());
}
Real parseChargeName(const std::string& name) {
if (name == "q_e") {
return PhysConst::q_e;
} else {
StringParseAbortMessage("Charge", name);
return 0.0;
}
}
Real parseChargeString(const std::string& name) {
if(name.substr(0, 1) == "-")
return -1.0 * parseChargeName(name.substr(1, name.size() - 1));
return parseChargeName(name);
}
Real parseMassString(const std::string& name) {
if (name == "m_e") {
return PhysConst::m_e;
} else if (name == "m_p"){
return PhysConst::m_p;
} else {
StringParseAbortMessage("Mass", name);
return 0.0;
}
}
}
ConstantDensityProfile::ConstantDensityProfile(Real density)
: _density(density)
{}
Real ConstantDensityProfile::getDensity(Real x, Real y, Real z) const
{
return _density;
}
CustomDensityProfile::CustomDensityProfile(const std::string& species_name)
{
ParmParse pp(species_name);
pp.getarr("custom_profile_params", params);
}
ConstantMomentumDistribution::ConstantMomentumDistribution(Real ux,
Real uy,
Real uz)
: _ux(ux), _uy(uy), _uz(uz)
{}
void ConstantMomentumDistribution::getMomentum(vec3& u) {
u[0] = _ux;
u[1] = _uy;
u[2] = _uz;
}
GaussianRandomMomentumDistribution::GaussianRandomMomentumDistribution(Real ux_m,
Real uy_m,
Real uz_m,
Real u_th)
: _ux_m(ux_m), _uy_m(uy_m), _uz_m(uz_m), _u_th(u_th),
momentum_distribution(0.0, u_th)
{
}
void GaussianRandomMomentumDistribution::getMomentum(vec3& u) {
Real ux_th = momentum_distribution(generator);
Real uy_th = momentum_distribution(generator);
Real uz_th = momentum_distribution(generator);
u[0] = _ux_m + ux_th;
u[1] = _uy_m + uy_th;
u[2] = _uz_m + uz_th;
}
PlasmaInjector::PlasmaInjector(int ispecies, const std::string& name)
: species_id(ispecies), species_name(name)
{
ParmParse pp(species_name);
// parse charge and mass
std::string charge_s;
pp.get("charge", charge_s);
std::transform(charge_s.begin(),
charge_s.end(),
charge_s.begin(),
::tolower);
charge = parseChargeString(charge_s);
std::string mass_s;
pp.get("mass", mass_s);
std::transform(mass_s.begin(),
mass_s.end(),
mass_s.begin(),
::tolower);
mass = parseMassString(mass_s);
// parse plasma boundaries
xmin = std::numeric_limits<amrex::Real>::lowest();
ymin = std::numeric_limits<amrex::Real>::lowest();
zmin = std::numeric_limits<amrex::Real>::lowest();
xmax = std::numeric_limits<amrex::Real>::max();
ymax = std::numeric_limits<amrex::Real>::max();
zmax = std::numeric_limits<amrex::Real>::max();
pp.query("xmin", xmin);
pp.query("ymin", ymin);
pp.query("zmin", zmin);
pp.query("xmax", xmax);
pp.query("ymax", ymax);
pp.query("zmax", zmax);
// get injection style
pp.get("injection_style", injection_style);
std::transform(injection_style.begin(),
injection_style.end(),
injection_style.begin(),
::tolower);
if (injection_style == "python") {
return;
}
else if (not (injection_style == "nrandomnormal" or
injection_style == "nrandomuniformpercell" or
injection_style == "ndiagpercell")) {
StringParseAbortMessage("Injection style", injection_style);
}
// parse density information
std::string rho_prof_s;
pp.get("profile", rho_prof_s);
std::transform(rho_prof_s.begin(),
rho_prof_s.end(),
rho_prof_s.begin(),
::tolower);
if (rho_prof_s == "constant") {
Real density;
pp.get("density", density);
rho_prof.reset(new ConstantDensityProfile(density));
} else if (rho_prof_s == "custom") {
rho_prof.reset(new CustomDensityProfile(species_name));
} else {
StringParseAbortMessage("Density profile type", rho_prof_s);
}
pp.get("num_particles_per_cell", num_particles_per_cell);
// parse momentum information
std::string mom_dist_s;
pp.get("momentum_distribution_type", mom_dist_s);
std::transform(mom_dist_s.begin(),
mom_dist_s.end(),
mom_dist_s.begin(),
::tolower);
if (mom_dist_s == "constant") {
Real ux = 0.;
Real uy = 0.;
Real uz = 0.;
pp.query("ux", ux);
pp.query("uy", uy);
pp.query("uz", uz);
mom_dist.reset(new ConstantMomentumDistribution(ux, uy, uz));
} else if (mom_dist_s == "gaussian") {
Real ux_m = 0.;
Real uy_m = 0.;
Real uz_m = 0.;
Real u_th = 0.;
pp.query("ux_m", ux_m);
pp.query("uy_m", uy_m);
pp.query("uz_m", uz_m);
pp.query("u_th", u_th);
mom_dist.reset(new GaussianRandomMomentumDistribution(ux_m, uy_m, uz_m, u_th));
} else {
StringParseAbortMessage("Momentum distribution type", mom_dist_s);
}
}
void PlasmaInjector::getMomentum(vec3& u) {
mom_dist->getMomentum(u);
u[0] *= PhysConst::c;
u[1] *= PhysConst::c;
u[2] *= PhysConst::c;
}
bool PlasmaInjector::insideBounds(Real x, Real y, Real z) {
if (x >= xmax || x < xmin ||
y >= ymax || y < ymin ||
z >= zmax || z < zmin ) return false;
return true;
}
Real PlasmaInjector::getDensity(Real x, Real y, Real z) {
return rho_prof->getDensity(x, y, z);
}
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