.. _program_listing_file_SPlisHSPlasH_Viscosity_Viscosity_Takahashi2015.h:

Program Listing for File Viscosity_Takahashi2015.h
==================================================

|exhale_lsh| :ref:`Return to documentation for file <file_SPlisHSPlasH_Viscosity_Viscosity_Takahashi2015.h>` (``SPlisHSPlasH/Viscosity/Viscosity_Takahashi2015.h``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #ifndef __Viscosity_Takahashi2015_h__
   #define __Viscosity_Takahashi2015_h__
   
   #include "SPlisHSPlasH/Common.h"
   #include "SPlisHSPlasH/FluidModel.h"
   #include "SPlisHSPlasH/NonPressureForceBase.h"
   #include "SPlisHSPlasH/Utilities/MatrixFreeSolver.h"
   
   
   namespace SPH
   {
       class Viscosity_Takahashi2015 : public NonPressureForceBase
       {
       protected: 
           std::vector<Vector3r> m_accel;
           std::vector<Matrix3r> m_viscousStress;
           typedef Eigen::ConjugateGradient<MatrixReplacement, Eigen::Lower | Eigen::Upper, Eigen::IdentityPreconditioner> Solver;
           Solver m_solver;
           Real m_viscosity;
           unsigned int m_iterations;
           unsigned int m_maxIter;
           Real m_maxError;
   
           virtual void initParameters();
           static void computeViscosityAcceleration(Viscosity_Takahashi2015 *visco, const Real* v);
   
       public:
           static std::string METHOD_NAME;
           static int VISCOSITY_COEFFICIENT;
           static int ITERATIONS;
           static int MAX_ITERATIONS;
           static int MAX_ERROR;
   
           Viscosity_Takahashi2015(FluidModel *model);
           virtual ~Viscosity_Takahashi2015(void);
   
           static NonPressureForceBase* creator(FluidModel* model) { return new Viscosity_Takahashi2015(model); }
           virtual std::string getMethodName() { return METHOD_NAME; }
   
           virtual void step();
           virtual void reset();
   
           virtual void performNeighborhoodSearchSort();
   
           static void matrixVecProd(const Real* vec, Real *result, void *userData);
           FORCE_INLINE static void diagonalMatrixElement(const unsigned int row, Real &result, void *userData);
   
           FORCE_INLINE const Matrix3r& getViscousStress(const unsigned int i) const
           {
               return m_viscousStress[i];
           }
   
           FORCE_INLINE Matrix3r& getViscousStress(const unsigned int i)
           {
               return m_viscousStress[i];
           }
   
           FORCE_INLINE void setViscousStress(const unsigned int i, const Matrix3r &val)
           {
               m_viscousStress[i] = val;
           }
   
           FORCE_INLINE const Vector3r& getAccel(const unsigned int i) const
           {
               return m_accel[i];
           }
   
           FORCE_INLINE Vector3r& getAccel(const unsigned int i)
           {
               return m_accel[i];
           }
   
           FORCE_INLINE void setAccel(const unsigned int i, const Vector3r &val)
           {
               m_accel[i] = val;
           }
       };
   }
   
   #endif