209 lines
6.3 KiB
C
209 lines
6.3 KiB
C
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/*---------------------------------------------------------------------------*\
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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 | Copyright (C) 2004-2007 Hrvoje Jasak
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\\/ M anipulation |
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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 the
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Free Software Foundation; either version 2 of the License, or (at your
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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, write to the Free Software Foundation,
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Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Application
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elasticPlasticNonLinTLSolidFoam
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Description
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Finite volume structural solver employing an incremental strain total
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Lagrangian approach, with Mises plasticity.
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Valid for finite strains, finite displacements and finite rotations.
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Author
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Philip Cardiff UCD
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\*---------------------------------------------------------------------------*/
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#include "fvCFD.H"
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#include "constitutiveModel.H"
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#include "solidContactFvPatchVectorField.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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# include "createFields.H"
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# include "createHistory.H"
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# include "readDivDSigmaExpMethod.H"
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# include "readDivDSigmaNonLinExpMethod.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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Info<< "\nStarting time loop\n" << endl;
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while(runTime.loop())
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{
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Info<< "Time: " << runTime.timeName() << nl << endl;
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# include "readStressedFoamControls.H"
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int iCorr = 0;
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scalar initialResidual = 0;
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lduMatrix::solverPerformance solverPerf;
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scalar relativeResidual = GREAT;
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lduMatrix::debug=0;
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do
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{
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DU.storePrevIter();
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# include "calculateDivDSigmaExp.H"
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# include "calculateDivDSigmaNonLinExp.H"
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// incremental form
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// linear momentum conservation
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// ensuring conservation of total momentum
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fvVectorMatrix DUEqn
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(
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fvm::d2dt2(rho, DU)
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==
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fvm::laplacian(2*muf + lambdaf, DU, "laplacian(DDU,DU)")
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+ divDSigmaExp
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+ divDSigmaNonLinExp
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//- fvc::div(2*mu*DEpsilonP, "div(sigma)")
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- fvc::div(2*muf*( mesh.Sf() & fvc::interpolate(DEpsilonP)) )
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);
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// if(thirdOrderCorrection)
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// {
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// # include "calculateThirdOrderDissipativeTerm.H"
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// DUEqn -= divThirdOrderTerm;
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// }
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if(largeStrainOverRelax)
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{
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// the terms (gradDU & gradU.T()) and (gradU & gradDU.T())
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// are linearly dependent of DU and represent initial displacement effect
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// which can cause convergence difficulties when treated explicitly
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// so we implicitly over-relax with gradU & gradDU here
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// which tends to help convergence
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// this should improve convergence when gradU is large
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// but maybe not execution time
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DUEqn -=
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fvm::laplacian((2*mu + lambda)*gradU, DU, "laplacian(DDU,DU)")
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- fvc::div( (2*mu + lambda)*(gradU&gradDU), "div(sigma)");
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//- fvc::div(mesh.magSf()*( (muf+lambdaf) * (n & fvc::interpolate( gradU & gradDU) ) ) );
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}
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if(nonLinearSemiImplicit)
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{
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// experimental
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// we can treat the nonlinear term (gradDU & gradDU.T()) in a
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// semi-implicit over-relaxed manner
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// this should improve convergence when gradDU is large
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// but maybe not execution time
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DUEqn -=
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fvm::laplacian((2*mu + lambda)*gradDU, DU, "laplacian(DDU,DU)")
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- fvc::div( (2*mu + lambda)*(gradDU&gradDU), "div(sigma)");
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// try use old gradDU as an OK guess, as gradDU will oscillate
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// and might make the convergence worse
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// DUEqn -=
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// fvm::laplacian((2*mu + lambda)*gradDU.oldTime(), DU, "laplacian(DDU,DU)")
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// - fvc::div( (2*mu + lambda)*(gradDU.oldTime()&gradDU), "div(sigma)");
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}
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solverPerf = DUEqn.solve();
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if(iCorr == 0)
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{
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initialResidual = solverPerf.initialResidual();
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}
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if(aitkenRelax)
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{
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# include "aitkenRelaxation.H"
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}
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else
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{
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DU.relax();
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}
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gradDU = fvc::grad(DU);
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// correct plasticty term
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rheology.correct();
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# include "calculateDEpsilonDSigma.H"
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# include "calculateRelativeResidual.H"
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if(iCorr % infoFrequency == 0)
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{
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Info << "\tTime " << runTime.value()
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<< ", Corrector " << iCorr
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<< ", Solving for " << DU.name()
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<< " using " << solverPerf.solverName()
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<< ", res = " << solverPerf.initialResidual()
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<< ", rel res = " << relativeResidual;
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if(aitkenRelax) Info << ", aitken = " << aitkenTheta;
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Info << ", iters = " << solverPerf.nIterations() << endl;
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}
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}
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while
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(
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iCorr++ == 0
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(//solverPerf.initialResidual() > convergenceTolerance
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relativeResidual > convergenceTolerance
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&&
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iCorr < nCorr)
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);
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Info << nl << "Time " << runTime.value() << ", Solving for " << DU.name()
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<< ", Initial residual = " << initialResidual
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<< ", Final residual = " << solverPerf.initialResidual()
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<< ", Relative residual = " << relativeResidual
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<< ", No outer iterations " << iCorr
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<< nl << "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
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<< " ClockTime = " << runTime.elapsedClockTime() << " s"
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<< endl;
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// update total quantities
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U += DU;
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gradU += gradDU;
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epsilon += DEpsilon;
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epsilonP += rheology.DEpsilonP();
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sigma += DSigma;
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rheology.updateYieldStress();
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rho = rho/det(I+gradU);
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# include "writeFields.H"
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# include "writeHistory.H"
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Info<< "ExecutionTime = "
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<< runTime.elapsedCpuTime()
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<< " s\n\n" << endl;
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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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