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/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | www.openfoam.com
\\/ M anipulation |
-------------------------------------------------------------------------------
Copyright (C) 2007-2019 PCOpt/NTUA
Copyright (C) 2013-2019 FOSS GP
Copyright (C) 2019 OpenCFD Ltd.
-------------------------------------------------------------------------------
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
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
Class
Foam::DBFGS
Description
The quasi-Newton BFGS formula with the dampening proposed by Powell
SourceFiles
DBFGS.C
\*---------------------------------------------------------------------------*/
#ifndef DBFGS_H
#define DBFGS_H
#include "updateMethod.H"
#include "scalarMatrices.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
/*---------------------------------------------------------------------------*\
Class DBFGS Declaration
\*---------------------------------------------------------------------------*/
class DBFGS
:
public updateMethod
{
protected:
// Protected data
//- Step for the Newton method
scalar etaHessian_;
//- Number of first steepest descent steps
label nSteepestDescent_;
//- Map to active design variables
labelList activeDesignVars_;
//- Scale the initial unitary Hessian approximation
bool scaleFirstHessian_;
//- Curvature threshold
scalar curvatureThreshold_;
//- The Hessian. Should have the size of the active design variables
SquareMatrix<scalar> Hessian_;
//- The previous Hessian
SquareMatrix<scalar> HessianOld_;
//- The previous derivatives
scalarField derivativesOld_;
//- The previous correction
scalarField correctionOld_;
//- Optimisation cycle counter
label counter_;
//- Threshold for damping
scalar gamma_;
// Protected Member Functions
//- Allocate matrices in the first optimisation cycle
void allocateMatrices();
//- Update approximation of the inverse Hessian
void updateHessian();
//- Update design variables
void update();
//- Read old info from dict
void readFromDict();
private:
// Private Member Functions
DBFGS(const DBFGS&) = delete;
//- No copy assignment
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void operator=(const DBFGS&) = delete;
public:
//- Runtime type information
TypeName("DBFGS");
// Constructors
//- Construct from components
DBFGS(const fvMesh& mesh, const dictionary& dict);
//- Destructor
virtual ~DBFGS() = default;
// Member Functions
//- Compute design variables correction
void computeCorrection();
//- Update old correction. Useful for quasi-Newton methods coupled with
//- line search
virtual void updateOldCorrection(const scalarField& oldCorrection);
//- Write old info to dict
virtual void write();
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //