elasticityMotionSolver.H

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    Copyright (C) 2013-2019 FOSS GP
    Copyright (C) 2019 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
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Class
    Foam::elasticityMotionSolver
 
Description
    Mesh deformation based on the linear elasticity equations.
    The boundary displacement is set as a boundary condition
    on the pointMotionU field.
 
    Reference:
    \verbatim
        Dwight, R. P., (2009).
        Robust Mesh Deformation using the Linear Elasticity Equations.
        Computational Fluid Dynamics 2006, 401-406.
        Springer Berlin Heidelberg.
    \endverbatim
 
SourceFiles
    elasticityMotionSolver.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef elasticityMotionSolver_H
#define elasticityMotionSolver_H
 
#include "motionSolver.H"
#include "volFields.H"
#include "pointFields.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward class declarations
class motionInterpolation;
class mapPolyMesh;
 
/*---------------------------------------------------------------------------*\
                    Class elasticityMotionSolver Declaration
\*---------------------------------------------------------------------------*/
 
class elasticityMotionSolver
:
    public motionSolver
{
protected:
 
    // Protected data
 
        //- Since the mesh deformation is broken down to multiple steps,
        //- mesh points need to be moved here.
        //- Hence, the non-const mesh reference
        fvMesh& fvMesh_;
        pointVectorField pointMotionU_;
        volVectorField cellMotionU_;
 
        //- Interpolation used to transfer cell displacement to the points
        autoPtr<motionInterpolation> interpolationPtr_;
 
        //- Inverse cell volume diffusivity
        volScalarField E_;
 
        //- Exponent to stiffen highly morphed cells
        scalar exponent_;
 
        //- Intermediate steps to solve the PDEs
        label nSteps_;
 
        //- Number of laplacian iterations per solution step
        label nIters_;
 
        //- Residual threshold
        scalar tolerance_;
 
 
    // Protected Member Functions
 
        //- Set boundary conditions of cellMotionU based on pointMotionU.
        //  Avoiding the use of the cellMotionFvPatchField bc
        //  due to the use of the registry in order to grab pointMotionU, which
        //  may give problems if multiple objects of this class are constructed
        //  at the same time
        void setBoundaryConditions();
 
 
private:
 
    // Private Member Functions
 
        //- No copy construct
        elasticityMotionSolver(const elasticityMotionSolver&) = delete;
 
        //- No copy assignment
        void operator=(const elasticityMotionSolver&) = delete;
 
 
public:
 
    //- Runtime type information
    TypeName("elasticityMotionSolver");
 
 
    // Constructors
 
        //- Construct from mesh and dictionary
        elasticityMotionSolver
        (
            const polyMesh& mesh,
            const IOdictionary& dict
        );
 
 
    //- Destructor
    virtual ~elasticityMotionSolver() = default;
 
 
    // Member Functions
 
        //- Get const and non-const references to pointMotionU
        inline pointVectorField& pointMotionU();
        inline const pointVectorField& pointMotionU() const;
 
        //- Get const and non-const references to cellMotionU
        inline volVectorField& cellMotionU();
        inline const volVectorField& cellMotionU() const;
 
        //- Return point location. Mesh is actually moved in solve()
        virtual tmp<pointField> curPoints() const;
 
        //- Solve for motion.
        //  Does the actual mesh displacement here, since it is broken down
        //  into multiple steps
        virtual void solve();
 
        //- Update local data for geometry changes
        virtual void movePoints(const pointField&);
 
        //- Update the mesh corresponding to given map
        virtual void updateMesh(const mapPolyMesh&);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "elasticityMotionSolverI.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //