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ExtrinsicModelTwoTemperature.cpp
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Fri, Nov 8, 04:01

ExtrinsicModelTwoTemperature.cpp
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// ATC_Transfer Headers
#include "ExtrinsicModelTwoTemperature.h"
#include "ATC_Error.h"
#include "FieldEulerIntegrator.h"
#include "ATC_Transfer.h"
#include "LammpsInterface.h"
#include "PrescribedDataManager.h"
#include "PhysicsModelTwoTemperature.h"
#include "ImplicitSolveOperator.h"
namespace ATC {
//--------------------------------------------------------
//--------------------------------------------------------
// Class ExtrinsicModelTwoTemperature
//--------------------------------------------------------
//--------------------------------------------------------
//--------------------------------------------------------
// Constructor
//--------------------------------------------------------
ExtrinsicModelTwoTemperature::ExtrinsicModelTwoTemperature
(ExtrinsicModelManager * modelManager,
ExtrinsicModelType modelType,
string matFileName) :
ExtrinsicModel(modelManager,modelType,matFileName),
nsubcycle_(1),
electronTimeIntegration_(TimeIntegrator::IMPLICIT),
temperatureIntegrator_(NULL),
exchangeFlag_(true),
baseSize_(0)
{
physicsModel_ = new PhysicsModelTwoTemperature(matFileName,
modelManager->get_atc_transfer());
// set up correct masks for coupling
rhsMaskIntrinsic_.reset(NUM_FIELDS,NUM_FLUX);
rhsMaskIntrinsic_ = false;
rhsMaskIntrinsic_(TEMPERATURE,SOURCE) = true;
atc_->fieldMask_(TEMPERATURE,EXTRINSIC_SOURCE) = true;
}
//--------------------------------------------------------
// Destructor
//--------------------------------------------------------
ExtrinsicModelTwoTemperature::~ExtrinsicModelTwoTemperature()
{
}
//--------------------------------------------------------
// modify
//--------------------------------------------------------
bool ExtrinsicModelTwoTemperature::modify(int narg, char **arg)
{
bool match = false;
int argIndx = 0;
// energy exchange switch
/*! \page man_extrinsic_exchange fix_modify AtC extrinsic exchange
\section syntax
fix_modify AtC extrinsic exchange <on|off>
\section examples
<TT> fix_modify AtC extrinsic exchange on </TT> \n
\section description
Switches energy exchange between the MD system and electron system on and off
\section restrictions
Only valid for use with two_temperature type of AtC fix.
\section related
see \ref man_fix_atc
\section default
on
*/
if (strcmp(arg[argIndx],"exchange")==0) {
argIndx++;
if (strcmp(arg[argIndx],"off")==0) {
exchangeFlag_ = false;
rhsMaskIntrinsic_(TEMPERATURE,SOURCE) = false;
atc_->fieldMask_(ELECTRON_TEMPERATURE,SOURCE) = false;
atc_->fieldMask_(TEMPERATURE,EXTRINSIC_SOURCE) = false;
}
else {
exchangeFlag_ = true;
rhsMaskIntrinsic_(TEMPERATURE,SOURCE) = true;
atc_->fieldMask_(ELECTRON_TEMPERATURE,SOURCE) = true;
atc_->fieldMask_(TEMPERATURE,EXTRINSIC_SOURCE) = true;
}
match = true;
} // end "exchange"
// electron integration type
/*! \page man_electron_integration fix_modify AtC extrinsic electron_integration
\section syntax
fix_modify AtC extrinsic electron_integration <integration_type> <num_subcyle_steps(optional)> \n
- integration_type (string) = explicit | implicit | steady \n
- num_subcycle_steps (int), optional = number of subcycle steps for the electron time integration
\section examples
<TT> fix_modify AtC extrinsic electron_integration implicit </TT> \n
<TT> fix_modify AtC extrinsic electron_integration explicit 100 </TT> \n
\section description
Switches between integration scheme for the electron temperature. The number of subcyling steps used to integrate the electron temperature 1 LAMMPS timestep can be manually adjusted to capture fast electron dynamics.
\section restrictions
For use only with two_temperature type of AtC fix ( see \ref man_fix_atc ) \n
\section default
implicit\n
subcycle_steps = 1
*/
else if (strcmp(arg[argIndx],"electron_integration")==0) {
argIndx++;
nsubcycle_ = 1;
if (strcmp(arg[argIndx],"explicit")==0) {
electronTimeIntegration_ = TimeIntegrator::EXPLICIT;
match = true;
}
else if (strcmp(arg[argIndx],"implicit")==0) {
electronTimeIntegration_ = TimeIntegrator::IMPLICIT;
match = true;
}
else if (strcmp(arg[argIndx],"steady")==0) {
electronTimeIntegration_ = TimeIntegrator::STEADY;
match = true;
}
if (narg > ++argIndx) nsubcycle_ = atoi(arg[argIndx]);
} // end "electron_integration"
if (!match) {
match = ExtrinsicModel::modify(narg, arg);
}
return match;
}
//--------------------------------------------------------
// initialize
//--------------------------------------------------------
void ExtrinsicModelTwoTemperature::initialize()
{
int nNodes = atc_->get_fe_engine()->get_nNodes();
rhs_[TEMPERATURE].reset(nNodes,1);
rhs_[ELECTRON_TEMPERATURE].reset(nNodes,1);
// set up electron temperature integrator
Array2D <bool> rhsMask(NUM_FIELDS,NUM_FLUX);
rhsMask = false;
for (int i = 0; i < NUM_FLUX; i++) {
rhsMask(ELECTRON_TEMPERATURE,i) = atc_->fieldMask_(ELECTRON_TEMPERATURE,i);
}
if (temperatureIntegrator_) delete temperatureIntegrator_;
if (electronTimeIntegration_ == TimeIntegrator::STEADY) {
throw ATC_Error(0,"not implemented");
}
else if (electronTimeIntegration_ == TimeIntegrator::IMPLICIT) {
double alpha = 1; // backwards Euler
temperatureIntegrator_ = new FieldImplicitEulerIntegrator(
ELECTRON_TEMPERATURE, physicsModel_, atc_->get_fe_engine(), atc_,
rhsMask, alpha);
}
else {
temperatureIntegrator_ = new FieldExplicitEulerIntegrator(
ELECTRON_TEMPERATURE, physicsModel_, atc_->get_fe_engine(), atc_,
rhsMask);
}
// set up mass matrix
Array<FieldName> massMask(1);
massMask = ELECTRON_TEMPERATURE;
(atc_->feEngine_)->compute_lumped_mass_matrix(massMask,atc_->fields_,physicsModel_,atc_->elementToMaterialMap_,atc_->massMats_);
atc_->massMatInv_[ELECTRON_TEMPERATURE] = inv(atc_->massMats_[ELECTRON_TEMPERATURE]);
}
//--------------------------------------------------------
// pre initial integration
//--------------------------------------------------------
void ExtrinsicModelTwoTemperature::pre_init_integrate()
{
double dt = atc_->lammpsInterface_->dt();
double time = atc_->simTime_;
// integrate fast electron variable/s
// note: atc calls set_sources in pre_final_integrate
atc_->set_fixed_nodes();
double idt = dt/nsubcycle_;
for (int i = 0; i < nsubcycle_ ; ++i) {
temperatureIntegrator_->update(idt,time,atc_->fields_,rhs_);
}
}
//--------------------------------------------------------
// set coupling source terms
//--------------------------------------------------------
void ExtrinsicModelTwoTemperature::set_sources(FIELDS & fields, FIELDS & sources)
{
// compute source term with appropriate masking and physics model
atc_->evaluate_rhs_integral(rhsMaskIntrinsic_, fields,
sources,
atc_->FULL_DOMAIN, physicsModel_);
}
//--------------------------------------------------------
// output
//--------------------------------------------------------
void ExtrinsicModelTwoTemperature::output(double dt, OUTPUT_LIST & outputData)
{
// nodal data
outputData["dot_electron_temperature"]
= & rhs_[ELECTRON_TEMPERATURE];
// global data
if (atc_->lammpsInterface_->comm_rank() == 0) {
double T_mean = atc_->fields_[ELECTRON_TEMPERATURE].col_sum(0)/atc_->nNodes_;
atc_->feEngine_->add_global("electron_temperature_mean", T_mean);
double T_stddev = atc_->fields_[ELECTRON_TEMPERATURE].col_stdev(0);
atc_->feEngine_->add_global("electron_temperature_std_dev", T_stddev);
}
}
//--------------------------------------------------------
// size_vector
//--------------------------------------------------------
int ExtrinsicModelTwoTemperature::size_vector(int intrinsicSize)
{
baseSize_ = intrinsicSize;
return 2;
}
//--------------------------------------------------------
// compute_vector
//--------------------------------------------------------
bool ExtrinsicModelTwoTemperature::compute_vector(int n, double & value)
{
// output[1] = total electron energy
// output[2] = average electron temperature
if (n == baseSize_) {
Array<FieldName> mask(1);
FIELDS energy;
mask(0) = ELECTRON_TEMPERATURE;
(atc_->feEngine_)->compute_energy(mask,
atc_->fields_,
physicsModel_,
atc_->elementToMaterialMap_,
energy);
// convert to lammps energy units
double mvv2e = (atc_->lammpsInterface_)->mvv2e();
double electronEnergy = mvv2e * energy[ELECTRON_TEMPERATURE].col_sum();
value = electronEnergy;
return true;
}
else if (n == baseSize_+1) {
double electronTemperature = (atc_->fields_[ELECTRON_TEMPERATURE]).col_sum()/(atc_->nNodes_);
value = electronTemperature;
return true;
}
return false;
}
};

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