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