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