invBP.H

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