topODesignVariables.H

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Class
    Foam::topODesignVariables
 
Description
    Design variables for porosity-based topology optimisation (topO) problems
 
    Reference:
    \verbatim
        The main idea behind porosity-based topO can be found in
 
            Papoutsis-Kiachagias, E. M., & Giannakoglou, K. C. (2014).
            Continuous Adjoint Methods for Turbulent Flows, Applied to Shape
            and Topology Optimization: Industrial Applications.
            Archives of Computational Methods in Engineering, 23(2), 255-299.
            http://doi.org/10.1007/s11831-014-9141-9
 
        with regularisation and projection approaches following
 
            Lazarov, B. S., & Sigmund O. (2010).
            Filters in topology optimization based on Helmholtz-type
            differential equations.
            International Journal for Numerical Methods in Engineering,
            86(6), 765-781.
            https://doi.org/10.1002/nme.3072
    \endverbatim
 
SourceFiles
    topODesignVariables.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef topODesignVariables_H
#define topODesignVariables_H
 
#include "designVariables.H"
#include "topOVariablesBase.H"
#include "fieldRegularisation.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                     Class topODesignVariables Declaration
\*---------------------------------------------------------------------------*/
 
class topODesignVariables
:
    public topOVariablesBase,
    public designVariables
{
protected:
 
    // Protected data
 
        //- A subfield of the design variables corresponding to the porosity
        //- field.
        //  Usually the same as *this
        SubField<scalar> alpha_;
 
        //- Mechanism to regularise the field of design variables
        fieldRegularisation regularisation_;
 
        //- Write all fields related to imposition of the Brinkman
        //- penalisation (i.e. design variables, regularised design variables
        //- and the indicator field)
        bool writeAllFields_;
 
        //- Add the fvOptions necessary for topO automatically
        //  WIP
        bool addFvOptions_;
 
 
    // Protected Member Functions
 
        //- Update the design variables given their correction
        virtual void updateField
        (
            const scalarField& correction,
            const label fluidID = 0
        );
 
        //- Apply fixed values in certain zones
        void applyFixedValues();
 
        //- Set active design variables
        virtual void setActiveDesignVariables
        (
            const label fluidID = 0,
            const bool activeIO = false
        );
 
        //- Read field with (path of) the design variables and store input
        //- in the design variables list with optional offset
        void readField
        (
            const word& name,
            const label fluidID = 0,
            const bool setIOValues = false
        );
 
        //- Part of the constructor initialisation
        virtual void initialize();
 
 
private:
 
    // Private Member Functions
 
        //- Disallow default bitwise copy construct
        topODesignVariables(const topODesignVariables&) = delete;
 
        //- Disallow default bitwise assignment
        void operator=(const topODesignVariables&) = delete;
 
 
public:
 
    //- Runtime type information
    TypeName("topO");
 
    // Constructors
 
        //- Construct from dictionary
        topODesignVariables
        (
            fvMesh& mesh,
            const dictionary& dict
        );
 
        //- Construct from dictionary and size
        topODesignVariables
        (
            fvMesh& mesh,
            const dictionary& dict,
            const label size
        );
 
 
    // Selectors
 
        //- Construct and return the selected design variables
        static autoPtr<topODesignVariables> New
        (
            fvMesh& mesh,
            const dictionary& dict
        );
 
 
    //- Destructor
    virtual ~topODesignVariables() = default;
 
 
    // Member Functions
 
        //- Get the indicator field
        virtual const volScalarField& beta() const;
 
        //- Return interpolant.
        //  Defaults to beta in mono-fluid topO optimization
        virtual const scalarField& interpolationField
        (
            const word& interpolationFieldName = "beta"
        ) const;
 
        //- Interpolate between the given field and solid values
        virtual void interpolate
        (
            volScalarField& field,
            const topOInterpolationFunction& interpolationFunc,
            const FieldField<Field, scalar>& fluidValues,
            const scalarField& solidValues,
            const label fieldi,
            const word& interpolationFieldName = "beta"
        ) const;
 
        //- Post-processing sensitivities due to interpolations based on
        //- the indicator fields
        virtual void interpolationSensitivities
        (
            scalarField& sens,
            const topOInterpolationFunction& interpolationFunc,
            const FieldField<Field, scalar>& fluidValues,
            const scalarField& solidValues,
            const label fieldi,
            const word& designVariablesName,
            const word& interpolationFieldName = "beta"
        ) const;
 
        //- Nullify given field in the solid domain
        virtual void nullifyInSolid
        (
            scalarField& field,
            const topOInterpolationFunction& interpolationFunc
        ) const;
 
        //- Nullify given field in the solid domain
        virtual void nullifyInSolidSensitivities
        (
            scalarField& sens,
            const topOInterpolationFunction& interpolationFunc,
            const word& designVariablesName
        ) const;
 
        //- Return the Brinkman penalisation term
        virtual tmp<scalarField> penalty
        (
            const word& interpolationFieldName,
            const topOInterpolationFunction& interpolationFunc
        ) const;
 
        //- Return the penalty term derivative
        virtual tmp<scalarField> penaltySensitivities
        (
            const word& interpolationFieldName,
            const topOInterpolationFunction& interpolationFunc
        ) const;
 
        //- Update design variables based on a given correction
        virtual void update(scalarField& correction);
 
        //- Compute eta if not set in the first step
        virtual scalar computeEta(scalarField& correction);
 
        //- Whether to use global sum when computing matrix-vector products
        //- in update methods
        virtual bool globalSum() const;
 
        //- Assemble sensitivity derivatives, by combining the part related
        //- to the primal and adjoint solution with the part related to the
        //- design variables.
        //  Takes into consideration the adjoint to the regularisation process
        //  and the derivative of the interpolationFunc
        virtual tmp<scalarField> assembleSensitivities
        (
            adjointSensitivity& sens
        );
 
        //- Set initial values of the design variables
        //  For design variables sets that need to be initialised after the
        //  construction of the primal fields.
        virtual void setInitialValues();
 
        //- Automatically add fvOptions depending on the design variables
        //- to the primal and adjoint solvers
        //  WIP
        virtual void addFvOptions
        (
            const PtrList<primalSolver>& primalSolver,
            const PtrList<adjointSolverManager>& adjointSolverManagers
        );
 
        //- Get access to the regularisation object
        inline fieldRegularisation& getRegularisation()
        {
            return regularisation_;
        }
 
        //- Write porosity field to file
        virtual void writeDesignVars();
 
        //- The writeData function required by the regIOobject write operation
        virtual bool writeData(Ostream&) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //