invBP.H

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License
    This file is part of OpenFOAM.

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Class
    Foam::invBP

Description
    Computes the Brickmann penalization function for topology optimisation,
    based in the inverse of the function proposed by Borrvall and Petersson.

    Reference:
    \verbatim
        Borrvall, T., &  Petersson, J. (2002).
        TopO optimization of fluids in Stokes flow.
        International Journal for Numerical Methods in Fluids, 41(1), 77-107.
        https://doi.org/10.1002/fld.426
    \endverbatim

SourceFiles
    invBP.C

\*---------------------------------------------------------------------------*/

#ifndef invBP_H
#define invBP_H

#include "topOInterpolationFunction.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

/*---------------------------------------------------------------------------*\
                Class invBP Declaration
\*---------------------------------------------------------------------------*/

class invBP
:
    public topOInterpolationFunction
{

private:

    // Private Data

        //- Steepness parameter
        //  High b values lead to more steep interpolations - higher contrasts.
        //  May vary in time
        autoPtr<Function1<scalar>> b_;


    // Private Member Functions

        //- No copy construct
        invBP(const invBP&);

        //- No copy assignment
        void operator=(const invBP&);


public:

    //- Runtime type information
    TypeName("invBP");


    // Constructors

        //- Construct from components
        invBP
        (
            const fvMesh& mesh,
            const dictionary& dict
        );


    //- Destructor
    virtual ~invBP() = default;


    // Member Functions

        //- Interpolate argument and write to result
        virtual void interpolate
        (
            const scalarField& arg,
            scalarField& res
        ) const;

        //- Return of function with respect to the argument field
        virtual tmp<scalarField> derivative(const scalarField& arg) const;
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //