forked from lijiext/lammps
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
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#ifndef WEAK_EQUATION_DIFFUSION_H
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#define WEAK_EQUATION_DIFFUSION_H
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#include "WeakEquation.h"
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namespace ATC{
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/**
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* @class WeakEquationDiffusion
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* @brief species diffusion
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* c q,t = div q -->
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* int M c q,t = int B q
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*/
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class WeakEquationDiffusion : public WeakEquation {
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public:
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// constructor
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WeakEquationDiffusion();
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// destructor
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virtual ~WeakEquationDiffusion();
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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 false;} // note 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 set<string> needs_material_functions(void) const
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{
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set<string> needs;
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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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