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