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