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ElectronDragPower.cpp
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Thu, Jul 3, 19:41

ElectronDragPower.cpp
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#include "ElectronDragPower.h"
#include "Material.h"
#include "ATC_Error.h"
#include <iostream>
#include <vector>
using ATC_Utility::command_line;
using ATC_Utility::str2dbl;
using std::map;
using std::string;
using std::fstream;
using std::vector;
namespace ATC {
ElectronDragPowerLinear::ElectronDragPowerLinear(fstream &fileId,
map<string,double> & parameters,
Material * material)
: ElectronDragPower(),
electronDragInvTau_(0),
material_(material)
{
if (!fileId.is_open()) throw ATC_Error("cannot open material file");
vector<string> line;
while(fileId.good()) {
command_line(fileId, line);
if (line.size() == 0) continue;
if (line[0] == "end") break;
double value = str2dbl(line[1]);
if (line[0] == "inv_momentum_relaxation_time") {
electronDragInvTau_ = value;
parameters["inv_momentum_relaxation_time"] = electronDragInvTau_;
}
else {
throw ATC_Error( "unrecognized material function "+line[0]);
}
}
}
bool ElectronDragPowerLinear::electron_drag_power(const FIELD_MATS &fields,
const GRAD_FIELD_MATS &gradFields,
DENS_MAT & flux)
{
FIELD_MATS::const_iterator evField = fields.find(ELECTRON_VELOCITY);
const DENS_MAT & v = evField->second;
// -1/tau (m_e * n * v)
electron_drag_velocity_coefficient(fields,dragCoefWorkspace_);
for (int i = 0; i < v.nRows(); i++) {
double velocityMagnitude = 0.;
for (int j = 0; j < v.nCols(); j++)
velocityMagnitude -= v(i,j)*v(i,j);
flux(i,0) += velocityMagnitude*dragCoefWorkspace_(i,0); // adds flux to phonon temperature
}
return true;
}
void ElectronDragPowerLinear::electron_drag_velocity_coefficient(const FIELD_MATS &fields,
DENS_MAT & dragCoef)
{
FIELD_MATS::const_iterator enField = fields.find(ELECTRON_DENSITY);
const DENS_MAT & n = enField->second;
//n.print("DENS");
// -1/tau (m_e * n)
material_->inv_effective_mass(fields,invEffMassWorkspace_);
//invEffMassWorkspace_.print("INV MASS");
dragCoef = n;
dragCoef /= invEffMassWorkspace_;
dragCoef *= -electronDragInvTau_;
//dragCoef.print("DRAG COEF");
}
}

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