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The adjoint library is enhanced with new functionality enabling automated shape optimisation loops. A parameterisation scheme based on volumetric B-Splines is introduced, the control points of which act as the design variables in the optimisation loop [1, 2]. The control points of the volumetric B-Splines boxes can be defined in either Cartesian or cylindrical coordinates. The entire loop (solution of the flow and adjoint equations, computation of sensitivity derivatives, update of the design variables and mesh) is run within adjointOptimisationFoam. A number of methods to update the design variables are implemented, including popular Quasi-Newton methods like BFGS and methods capable of handling constraints like loop using the SQP or constraint projection. The software was developed by PCOpt/NTUA and FOSS GP, with contributions from Dr. Evangelos Papoutsis-Kiachagias, Konstantinos Gkaragounis, Professor Kyriakos Giannakoglou, Andy Heather [1] E.M. Papoutsis-Kiachagias, N. Magoulas, J. Mueller, C. Othmer, K.C. Giannakoglou: 'Noise Reduction in Car Aerodynamics using a Surrogate Objective Function and the Continuous Adjoint Method with Wall Functions', Computers & Fluids, 122:223-232, 2015 [2] E. M. Papoutsis-Kiachagias, V. G. Asouti, K. C. Giannakoglou, K. Gkagkas, S. Shimokawa, E. Itakura: ‘Multi-point aerodynamic shape optimization of cars based on continuous adjoint’, Structural and Multidisciplinary Optimization, 59(2):675–694, 2019
111 lines
3.6 KiB
C
111 lines
3.6 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | www.openfoam.com
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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Copyright (C) 2007-2019 PCOpt/NTUA
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Copyright (C) 2013-2019 FOSS GP
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Copyright (C) 2019 OpenCFD Ltd.
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Application
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writeActiveDesignVariables
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Description
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Writes the active design variables based on the selected parameterisation
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scheme, as read from the meshMovement part of optimisationDict.
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Keeps a back-up of the original optimisationDict in
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system/optimisationDict.org, as comments in the dict will be lost.
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\*---------------------------------------------------------------------------*/
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#include "fvCFD.H"
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#include "optMeshMovement.H"
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#include "updateMethod.H"
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#include "OFstream.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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int main(int argc, char *argv[])
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{
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#include "setRootCase.H"
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#include "createTime.H"
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#include "createMesh.H"
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IOdictionary optDict
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(
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IOobject
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(
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"optimisationDict",
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mesh.time().caseSystem(),
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mesh,
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IOobject::MUST_READ_IF_MODIFIED,
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IOobject::NO_WRITE
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)
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);
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// Back-up old optimisationDict, to maintain potential comments in it
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if (Pstream::master())
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{
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cp(optDict.objectPath(), optDict.objectPath() + ".org");
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}
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// Construct mesh movement object and grab active design variables
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// Will exit with error if not implemented for this type
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const dictionary& movementDict =
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optDict.subDict("optimisation").subDict("meshMovement");
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// Empty patch list will do
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labelList patchIDs(0);
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autoPtr<optMeshMovement> movementPtr
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(optMeshMovement::New(mesh, movementDict, patchIDs));
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const labelList activeDesignVariables =
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movementPtr().getActiveDesignVariables();
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// Construct update method to grab the type
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dictionary& updateMethodDict =
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optDict.subDict("optimisation").subDict("updateMethod");
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autoPtr<updateMethod> updMethod(updateMethod::New(mesh, updateMethodDict));
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// Add to appropriate dictionary (creates it if it does not exist)
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dictionary& coeffsDict = updateMethodDict.subDictOrAdd(updMethod().type());
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coeffsDict.add<labelList>
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(
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"activeDesignVariables",
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activeDesignVariables,
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true
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);
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// Write modified dictionary
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optDict.regIOobject::writeObject
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(
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IOstream::ASCII,
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IOstream::currentVersion,
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IOstream::UNCOMPRESSED,
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true
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);
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Info<< "End\n" << endl;
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return 0;
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}
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// ************************************************************************* //
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