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WeakEquationMomentum.h
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Fri, Nov 1, 19:08

WeakEquationMomentum.h
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#ifndef WEAK_EQUATION_MOMENTUM_H
#define WEAK_EQUATION_MOMENTUM_H
#include <set>
#include <string>
#include "WeakEquation.h"
namespace ATC{
class Material;
/**
* @class WeakEquationMomentum
* @brief Momentum
* rho v,t = div P -->
* int M rho v,t = int B P
*/
class WeakEquationMomentum : public WeakEquation {
public:
// constructor
WeakEquationMomentum();
// destructor
virtual ~WeakEquationMomentum();
/** integrand that used to form the energy */
virtual bool has_E_integrand(void) const {return true;}
virtual void E_integrand(const FIELD_MATS &fields,
const GRAD_FIELD_MATS &grad_fields,
const Material * material,
DENS_MAT &energy ) const;
/** 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 N as its weight */
virtual bool has_N_integrand(void) const {return true;}
virtual bool N_integrand(const FIELD_MATS &fields,
const GRAD_FIELD_MATS &grad_fields,
const Material * material,
DENS_MAT &flux) 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[4] = {"mass_density","stress","elastic_energy","body_force"};
std::set<std::string> needs(list,list+4);
return needs;
}
};
/**
* @class WeakEquationMomentumElectrostatic
* @brief Momentum with electrostatic forces
* rho v,t = div P + b -->
* int M rho v,t = int B P + N b
*/
class WeakEquationMomentumElectrostatic : public WeakEquationMomentum {
public:
// constructor
WeakEquationMomentumElectrostatic();
// destructor
virtual ~WeakEquationMomentumElectrostatic(){};
/** 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
{ WeakEquationMomentum::M_integrand(fields, material, density ); }
/** 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
{ WeakEquationMomentum::B_integrand(fields, grad_fields, material, flux); }
/** flux that is integrated with N as its weight */
virtual bool has_N_integrand(void) const {return true;}
virtual bool N_integrand(const FIELD_MATS &fields,
const GRAD_FIELD_MATS &grad_fields,
const Material * material,
DENS_MAT &flux) const ;
/** necessary interfaces */
virtual std::set<std::string> needs_material_functions(void) const
{
std::set<std::string> needs
= WeakEquationMomentum::needs_material_functions();
needs.insert("electric_field");
return needs;
}
protected:
/** conversion factor charge * electric field --> force */
double qE2f_;
mutable DENS_MAT_VEC _E_;
};
class WeakEquationMomentumDiffusion : public WeakEquation {
public:
// constructor
WeakEquationMomentumDiffusion();
// destructor
virtual ~WeakEquationMomentumDiffusion();
/** integrand that used to form the energy */
virtual bool has_E_integrand(void) const {return false;}
/** 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 N as its weight */
virtual bool has_N_integrand(void) const {return true;}
virtual bool N_integrand(const FIELD_MATS &fields,
const GRAD_FIELD_MATS &grad_fields,
const Material * material,
DENS_MAT &flux) 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 ;
/** linear RHS stiffness matrix */
virtual bool has_BB_tangent_coefficients(void) const {return true;}
virtual void BB_tangent_coefficients(const FieldName field,
const FIELD_MATS &fields,
const Material * material,
DENS_MAT &coefs) const;
/** necessary interfaces */
virtual std::set<std::string> needs_material_functions(void) const
{
std::string list[4] = {"mass_density","viscous_stress","body_force"};
std::set<std::string> needs(list,list+3);
return needs;
}
};
} // NAMESPACE
#endif

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