forked from lijiext/lammps
53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
#ifndef WEAK_EQUATION_MASS_DIFFUSION_H
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#define WEAK_EQUATION_MASS_DIFFUSION_H
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#include <set>
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#include <string>
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#include "WeakEquation.h"
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namespace ATC{
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/**
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* @class WeakEquationMassDiffusion
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* @brief Mass diffusion
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* c rho,t = div rho -->
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* int M c rho,t = int B rho
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*/
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class WeakEquationMassDiffusion : public WeakEquation {
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public:
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// constructor
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WeakEquationMassDiffusion();
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// destructor
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virtual ~WeakEquationMassDiffusion();
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/** density that used to form the mass matrix */
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virtual bool has_M_integrand(void) const {return true;}
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virtual void M_integrand(const FIELD_MATS &fields,
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const Material * material,
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DENS_MAT &density ) const ;
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/** flux that is integrated with B = Grad N as its weight */
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virtual bool has_B_integrand(void) const {return true;}
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virtual void B_integrand(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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/** necessary interfaces */
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virtual std::set<std::string> needs_material_functions(void) const
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{
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std::string list[1] = {"mass_density"};
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std::set<std::string> needs(list,list+1);
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return needs;
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}
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};
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};
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#endif
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