GCMMA.H

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License
    This file is part of OpenFOAM.
 
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    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::GCMMA
 
Description
    Class implementing a workaround for using the Globally converging wrapper
    of the MMA update method. Implemented as a lineSearch, even though the
    search direction changes within each inner iteration of GCMMA, due the
    existing framework for re-solving the primal equations and checking the
    convergence of a merit function.
 
    Reference:
    \verbatim
        Svanberg, K. (2002)
        A class of globally convergent optimization methods based on
        conservative convex separable approximations.
        SIAM Journal of Optimization, 12), 555-573.
        https://doi.org/10.1137/S1052623499362822
    \endverbatim
 
SourceFiles
    GCMMA.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef GCMMA_H
#define GCMMA_H
 
#include "lineSearch.H"
#include "MMA.H"
#include "OFstream.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                            Class GCMMA Declaration
\*---------------------------------------------------------------------------*/
 
class GCMMA
:
    public lineSearch
{
protected:
 
    // Protected data
 
        //- Cast of the update method to MMA
        MMA& mma_;
 
        //- File with rho values in each inner loop
        OFstream GCMMAFile_;
 
        //- File with CPU cost in each inner loop
        OFstream costFile_;
 
        //- Total cost, measured in Equivalent Flow Solutions, up to this cycle
        label cost_;
 
        //- Write the header of the output files
        bool writeHeader_;
 
 
    // Protected Member Functions
 
        //- Write rho and objective/constraint values & approx to files
        void writeToFiles(bool isConverged);
 
 
private:
 
    // Private Member Functions
 
        //- No copy construct
        GCMMA(const GCMMA&) = delete;
 
        //- No copy assignment
        void operator=(const GCMMA&) = delete;
 
 
public:
 
    //- Runtime type information
    TypeName("GCMMA");
 
 
    // Constructors
 
        //- Construct from components
        GCMMA
        (
            const dictionary& dict,
            const Time& time,
            updateMethod& UpdatheMethod
        );
 
 
    // Destructor
    virtual ~GCMMA() = default;
 
 
    // Member Functions
 
       //- Check whether linear search has converged
       virtual bool converged();
 
       //- Actually computes a new direction entirely,
       //- targeting the satisfaction of the GCMMA condition
       virtual void updateStep();
 
       //- Replace the correction with the one computed in updateStep
       virtual void updateCorrection(scalarField& correction);
 
       // Member operators
 
           //- Increment iteration number and store merit value corresponding to
           //- the previous optimisation cycle
           //virtual GCMMA& operator++();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //