Navier.h

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#ifndef Navier_included
#define Navier_included
 
#include <Cond_lim_base.h>
 
/*! @brief Navier Velocity boundary condition of type "Navier":
 *
 *       - normal component of velocity is zero
 *       - tangential component of velocity is free
 *       - imposed stress
 *     Examples: Symetrie (zero stress), Paroi_frottante (non-zero stress)
 *
 * @sa Cond_lim_base
 */
class Navier: public Cond_lim_base
{
  Declare_base(Navier);
public:
  int compatible_avec_eqn(const Equation_base&) const override { return 1; }
 
  virtual double coefficient_frottement(int ) const { return 0.; }
  virtual double coefficient_frottement(int , int ) const { return 0.; }
  virtual double coefficient_frottement_grad(int ) const { return 0.; } // Change the coefficient when calculation of gradient : nu = nullptr
  virtual double coefficient_frottement_grad(int , int ) const { return 0.; }
};
 
#endif