SIMPInterpolation.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2020-2023 PCOpt/NTUA
    Copyright (C) 2020-2023 FOSS GP
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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.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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    You should have received a copy of the GNU General Public License
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Class
    Foam::SIMPInterpolation
 
Description
    Computes the Brickmann penalization function for topology optimisation,
    using the SIMP approach proposed by Bendsøe
 
    Reference:
    \verbatim
        Bendsøe, M. P. (1989)
        Optimal shape design as a material distribution problem.
        Structural optimization, 1(4), 193–202.
        https://doi.org/10.1007/BF01650949
    \endverbatim
 
InterpolationFiles
    SIMPInterpolation.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef SIMPInterpolation_H
#define SIMPInterpolation_H
 
#include "topOInterpolationFunction.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                      Class SIMPInterpolation Declaration
\*---------------------------------------------------------------------------*/
 
class SIMPInterpolation
:
    public topOInterpolationFunction
{
    // Private Data
 
        //- Steepness parameter
        //  High b values lead to more steep interpolations - higher contrasts.
        //  May vary in time
        autoPtr<Function1<scalar>> b_;
 
private:
 
    // Private Member Functions
 
        //- No copy construct
        SIMPInterpolation(const SIMPInterpolation&);
 
        //- No copy assignment
        void operator=(const SIMPInterpolation&);
 
 
public:
 
    //- Runtime type information
    TypeName("SIMP");
 
 
    // Constructors
 
        //- Construct from components
        SIMPInterpolation
        (
            const fvMesh& mesh,
            const dictionary& dict
        );
 
 
    //- Destructor
    virtual ~SIMPInterpolation() = 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
 
// ************************************************************************* //