two_fluid_navier_stokes_alpha_method.h

Go to the documentation of this file.

//    |  /           |
//    ' /   __| _` | __|  _ \   __|
//    . \  |   (   | |   (   |\__ `
//   _|\_\_|  \__,_|\__|\___/ ____/
//                   Multi-Physics
//
//  License:         BSD License
//                   Kratos default license: kratos/license.txt
//
//  Main author:     Uxue Chasco
//
//
 
#if !defined(KRATOS_TWO_FLUID_NAVIER_STOKES_ALPHA_METHOD)
#define  KRATOS_TWO_FLUID_NAVIER_STOKES_ALPHA_METHOD
 
// System includes
 
// Project includes
#include "includes/define.h"
#include "includes/element.h"
#include "includes/variables.h"
#include "includes/serializer.h"
#include "includes/cfd_variables.h"
#include "custom_elements/two_fluid_navier_stokes.h"
#include "custom_utilities/fluid_element_utilities.h"
#include "utilities/geometry_utilities.h"
#include "modified_shape_functions/tetrahedra_3d_4_modified_shape_functions.h"
#include "modified_shape_functions/triangle_2d_3_modified_shape_functions.h"
 
namespace Kratos
{
 
/*The "TwoFluidNavierStokesAlphaMethod" element is an element based on the Variational Multiscale Stabilization technique (VMS)
* which is designed for the solution of a two fluids (air and a non-air one) problems.
*
* A distinctive feature of the element is the use of 4 LOCAL enrichment functions, which allows to model
* a discontinuity in both the pressure field and in its gradient.
* The enrichment functions are obtained by duplicating all of the degrees of freedom of the element.
* Since the enrichment is performed elementwise, a purely local static condensation step is performed,
* meaning that no extra degrees of freedom are added..
*
* Since a jump in the pressure can be considered, the element shall be able to habdle moderate changes of the viscosity
* between the two fluids to be considered*/
 
 
 
 
 
 
template< class TElementData >
class TwoFluidNavierStokesAlphaMethod : public TwoFluidNavierStokes<TElementData>
{
public:
 
    KRATOS_CLASS_INTRUSIVE_POINTER_DEFINITION(TwoFluidNavierStokesAlphaMethod);
 
 
    using BaseType = TwoFluidNavierStokes<TElementData>;
 
    typedef Node NodeType;
    typedef Geometry<NodeType> GeometryType;
    typedef Geometry<NodeType>::PointsArrayType NodesArrayType;
    typedef Vector VectorType;
    typedef Matrix MatrixType;
    typedef std::size_t IndexType;
    typedef std::size_t SizeType;
    typedef std::vector<std::size_t> EquationIdVectorType;
    typedef std::vector< Dof<double>::Pointer > DofsVectorType;
    typedef PointerVectorSet<Dof<double>, IndexedObject> DofsArrayType;
    typedef typename TwoFluidNavierStokes<TElementData>::ShapeFunctionsType ShapeFunctionsType;
    typedef typename TwoFluidNavierStokes<TElementData>::ShapeFunctionDerivativesType ShapeFunctionDerivativesType;
    typedef typename TwoFluidNavierStokes<TElementData>::ShapeFunctionDerivativesArrayType ShapeFunctionDerivativesArrayType;
    constexpr static unsigned int Dim = TwoFluidNavierStokes<TElementData>::Dim;
    constexpr static unsigned int NumNodes = TwoFluidNavierStokes<TElementData>::NumNodes;
    constexpr static unsigned int BlockSize = TwoFluidNavierStokes<TElementData>::BlockSize;
    constexpr static unsigned int LocalSize = TwoFluidNavierStokes<TElementData>::LocalSize;
    constexpr static unsigned int StrainSize = (Dim - 1) * 3;
 
 
 
    TwoFluidNavierStokesAlphaMethod(IndexType NewId = 0);
 
 
    TwoFluidNavierStokesAlphaMethod(IndexType NewId, const NodesArrayType& ThisNodes);
 
 
    TwoFluidNavierStokesAlphaMethod(IndexType NewId, GeometryType::Pointer pGeometry);
 
 
    TwoFluidNavierStokesAlphaMethod(IndexType NewId, GeometryType::Pointer pGeometry, Properties::Pointer pProperties);
 
    virtual ~TwoFluidNavierStokesAlphaMethod();
 
 
 
 
    Element::Pointer Create(IndexType NewId,
        NodesArrayType const& ThisNodes,
        Properties::Pointer pProperties) const override;
 
 
    Element::Pointer Create(IndexType NewId,
        GeometryType::Pointer pGeom,
        Properties::Pointer pProperties) const override;
 
    void CalculateOnIntegrationPoints(
        const Variable<double> &rVariable,
        std::vector<double> &rOutput,
        const ProcessInfo &rCurrentProcessInfo) override;
        
    void Calculate(
        const Variable<double> &rVariable,
        double &rOutput,
        const ProcessInfo &rCurrentProcessInfo) override;
 
 
 
 
 
 
protected:
 
 
 
 
    void PressureGradientStabilization(
        const TElementData &rData,
        const Vector &rInterfaceWeights,
        const Matrix &rEnrInterfaceShapeFunctionPos,
        const Matrix &rEnrInterfaceShapeFunctionNeg,
        const GeometryType::ShapeFunctionsGradientsType &rInterfaceShapeDerivatives,
        MatrixType &rKeeTot,
        VectorType &rRHSeeTot) override;
 
    void ComputeGaussPointLHSContribution(
        TElementData& rData,
        MatrixType& rLHS) override;
 
    void ComputeGaussPointRHSContribution(
        TElementData& rData,
        VectorType& rRHS) override;
 
    void ComputeGaussPointEnrichmentContributions(
        TElementData& rData,
        MatrixType& rV,
        MatrixType& rH,
        MatrixType& rKee,
        VectorType& rRHS_ee) override;
 
    void CalculateStrainRate(TElementData& rData) const override;
 
    double CalculateArtificialDynamicViscositySpecialization(TElementData &rData) const;
 
 
 
 
 
 
 
    friend class Serializer;
 
    void save(Serializer& rSerializer) const override;
 
    void load(Serializer& rSerializer) override;
 
private:
 
 
 
 
    TwoFluidNavierStokesAlphaMethod& operator=(TwoFluidNavierStokesAlphaMethod const& rOther);
 
    TwoFluidNavierStokesAlphaMethod(TwoFluidNavierStokesAlphaMethod const& rOther);
 
 
}; // Class TwoFluidNavierStokesAlphaMethod
 
 
template< class TElementData >
inline std::istream& operator >> (std::istream& rIStream,
    TwoFluidNavierStokesAlphaMethod<TElementData>& rThis)
{
    return rIStream;
}
 
template< class TElementData >
inline std::ostream& operator <<(std::ostream& rOStream,
    const TwoFluidNavierStokesAlphaMethod<TElementData>& rThis)
{
    rThis.PrintInfo(rOStream);
    rOStream << std::endl;
    rThis.PrintData(rOStream);
 
    return rOStream;
}
 
} // namespace Kratos.
 
#endif // KRATOS_TWO_FLUID_NAVIER_STOKES_ALPHA_METHOD