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lammps/lib/atc/WeakEquationPoisson.cpp
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WeakEquationPoisson.cpp
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#include "WeakEquationPoisson.h"
#include "Material.h"
#include <iostream>
#include <fstream>
namespace ATC {
//==============================================================
// Class WeakEquationPoisson
//==============================================================
// R = B^T flux + N source = 0
// 0 = B^T perm B phi - N rho_+
//--------------------------------------------------------------
// Constructor
//--------------------------------------------------------------
WeakEquationPoisson::WeakEquationPoisson()
: WeakEquation(STATIC_PDE,ELECTRIC_POTENTIAL,1)
{}
//---------------------------------------------------------------------
void WeakEquationPoisson::B_integrand(
const FIELD_MATS &fields,
const GRAD_FIELD_MATS &grad_fields,
const Material * material,
DENS_MAT_VEC &flux) const
{
// flux = - perm D_x phi
material->electric_displacement(fields, grad_fields, flux);
flux[0] *= -1;
flux[1] *= -1;
flux[2] *= -1;
}
//---------------------------------------------------------------------
void WeakEquationPoisson::BB_tangent_coefficients(
const FieldName field,
const FIELD_MATS &fields,
const Material* material,
DENS_MAT &coefs) const
{
material->permittivity(fields,coefs); // convention evalues (B^T perm B) > 0
}
//---------------------------------------------------------------------
bool WeakEquationPoisson::N_integrand(
const FIELD_MATS &fields,
const GRAD_FIELD_MATS &grad_fields,
const Material * material,
DENS_MAT &flux) const
{
return material->electron_charge_density(fields,flux); // - N rho_+ = N n
}
//---------------------------------------------------------------------
void WeakEquationPoisson::NN_tangent_coefficients(
const FieldName field,
const FIELD_MATS &fields,
const Material* material,
DENS_MAT &coefs) const
{
material->D_electron_charge_density(ELECTRIC_POTENTIAL,fields,coefs);
}
//==============================================================
// Class WeakEquationPoissonConstantRHS
//==============================================================
//--------------------------------------------------------------
// Constructor
//--------------------------------------------------------------
WeakEquationPoissonConstantRHS::WeakEquationPoissonConstantRHS()
: WeakEquationPoisson()
{}
//---------------------------------------------------------------------
bool WeakEquationPoissonConstantRHS::N_integrand(
const FIELD_MATS &fields,
const GRAD_FIELD_MATS &grad_fields,
const Material * material,
DENS_MAT &flux) const
{
FIELD_MATS::const_iterator nIter = fields.find(ELECTRON_DENSITY);
if (nIter != fields.end()) {
const DENS_MAT & n = nIter->second;
flux = -1.0*n;
return true;
}
return false;
}
};
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