198 lines
5 KiB
C++
198 lines
5 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | foam-extend: Open Source CFD
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\\ / O peration | Version: 4.0
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\\ / A nd | Web: http://www.foam-extend.org
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\\/ M anipulation | For copyright notice see file Copyright
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-------------------------------------------------------------------------------
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License
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This file is part of foam-extend.
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foam-extend 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 the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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foam-extend is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License 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 foam-extend. If not, see <http://www.gnu.org/licenses/>.
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Application
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PODecomposition
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Author
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Hrvoje Jasak, Wikki Ltd. All rights reserved.
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Description
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Calculates proper orthogonal decomposition of a given field set
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\*---------------------------------------------------------------------------*/
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#include "fvCFD.H"
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#include "PODOrthoNormalBases.H"
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#include "VectorSpace.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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// Get times list
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instantList Times = runTime.times();
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const label startTime = 1;
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const label endTime = Times.size();
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const label nSnapshots = Times.size() - 1;
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Info << "Number of snapshots: " << nSnapshots << endl;
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// Create a list of snapshots
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PtrList<volVectorField> fields(nSnapshots);
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runTime.setTime(Times[startTime], startTime);
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# include "createMesh.H"
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IOdictionary PODsolverDict
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(
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IOobject
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(
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"PODsolverDict",
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runTime.system(),
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mesh,
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IOobject::MUST_READ,
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IOobject::NO_WRITE
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)
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);
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scalar accuracy =
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readScalar
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(
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PODsolverDict.subDict("scalarTransportCoeffs").lookup("accuracy")
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);
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Info << "Seeking accuracy: " << accuracy << endl;
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word fieldName
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(
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PODsolverDict.subDict("scalarTransportCoeffs").lookup("velocity")
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);
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label snapI = 0;
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labelList timeIndices(nSnapshots);
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for (label i = startTime; i < endTime; i++)
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{
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runTime.setTime(Times[i], i);
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Info<< "Time = " << runTime.timeName() << endl;
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mesh.readUpdate();
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Info<< " Reading " << fieldName << endl;
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fields.set
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(
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snapI,
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new volVectorField
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(
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IOobject
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(
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fieldName,
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runTime.timeName(),
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mesh,
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IOobject::MUST_READ
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),
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mesh
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)
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);
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// Rename the field
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fields[snapI].rename(fieldName + name(i));
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timeIndices[snapI] = i;
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snapI++;
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Info<< endl;
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}
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timeIndices.setSize(snapI);
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vectorPODOrthoNormalBase eb(fields, accuracy);
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const RectangularMatrix<vector>& coeffs = eb.interpolationCoeffs();
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// Check all snapshots
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forAll (fields, fieldI)
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{
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runTime.setTime(Times[timeIndices[fieldI]], timeIndices[fieldI]);
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volVectorField reconstruct
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(
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IOobject
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(
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fieldName + "PODreconstruct",
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runTime.timeName(),
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mesh,
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IOobject::NO_READ
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),
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mesh,
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dimensionedVector
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(
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"zero",
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fields[fieldI].dimensions(),
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vector::zero
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)
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);
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for (label baseI = 0; baseI < eb.baseSize(); baseI++)
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{
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reconstruct +=
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cmptMultiply
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(
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eb.orthoField(baseI),
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coeffs[fieldI][baseI]
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);
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}
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scalar sumFieldError =
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sumMag
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(
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reconstruct.internalField()
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- fields[fieldI].internalField()
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);
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scalar measure = sumMag(fields[fieldI].internalField()) + SMALL;
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Info<< "Field error: absolute = " << sumFieldError << " relative = "
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<< sumFieldError/measure << " measure = " << measure
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<< endl;
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reconstruct.write();
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}
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// Write out all fields
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runTime.setTime(Times[startTime], startTime);
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Info<< "Writing POD base for Time = " << runTime.timeName() << endl;
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for (label i = 0; i < eb.baseSize(); i++)
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{
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eb.orthoField(i).write();
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}
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Info << endl;
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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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