Program Listing for File Viscosity_Takahashi2015.h

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#ifndef __Viscosity_Takahashi2015_h__
#define __Viscosity_Takahashi2015_h__

#include "SPlisHSPlasH/Common.h"
#include "SPlisHSPlasH/FluidModel.h"
#include "ViscosityBase.h"
#include "SPlisHSPlasH/Utilities/MatrixFreeSolver.h"


namespace SPH
{
    class Viscosity_Takahashi2015 : public ViscosityBase
    {
    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;
        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 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 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