221 lines
6.9 KiB
C
221 lines
6.9 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 | Copyright held by original author
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Description
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Calculates the total forces on a patch:
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total force vector
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total normal force
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total force in each direction (x, y and z)
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Author
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philip.cardiff@ucd.ie
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\*---------------------------------------------------------------------------*/
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#include "fvCFD.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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int main(int argc, char *argv[])
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{
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argList::validArgs.append("patch name");
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argList::validOptions.insert("noMeshUpdate", "");
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argList::validOptions.insert("nonLinear", "");
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# include "addTimeOptions.H"
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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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// set startTime and endTime depending on -time and -latestTime options
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# include "checkTimeOptions.H"
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runTime.setTime(Times[startTime], startTime);
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# include "createMesh.H"
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bool noMeshUpdate = args.optionFound("noMeshUpdate");
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bool nonLinear = args.optionFound("nonLinear");
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word patchName(args.additionalArgs()[0]);
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label patchID = mesh.boundaryMesh().findPatchID(patchName);
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if(patchID == -1)
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{
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FatalError << "Cannot find patch " << patchName
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<< exit(FatalError);
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}
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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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if(!noMeshUpdate)
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{
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mesh.readUpdate();
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}
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IOobject sigmaheader
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(
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"sigma",
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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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// Check sigma exists
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if (sigmaheader.headerOk())
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{
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Info<< "\tReading sigma" << endl;
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volSymmTensorField sigma(sigmaheader, mesh);
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Info << nl;
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// gradU needed for nonLinear
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volTensorField* gradUPtr = NULL;
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volSymmTensorField* sigmaCauchyPtr = NULL;
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if(nonLinear)
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{
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gradUPtr = new volTensorField
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(
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IOobject
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(
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"grad(U)",
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runTime.timeName(),
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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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mesh
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);
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sigmaCauchyPtr = new volSymmTensorField
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(
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IOobject
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(
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"sigmaCauchy",
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runTime.timeName(),
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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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mesh
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);
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}
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//vector netForce = vector::zero;
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//vector netForceCauchy = vector::zero;
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//scalar maxPatchForce = 0.0;
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//forAll(mesh.boundary(), patchID)
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{
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vectorField n = mesh.boundary()[patchID].nf();
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const vectorField& Sf = mesh.boundary()[patchID].Sf();
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const symmTensorField& sigmaPatch = sigma.boundaryField()[patchID];
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vectorField totalForce(sigmaPatch.size(), vector::zero);
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scalar totalNormalForce = 0.0;
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vector totalShearForce = vector::zero;
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vectorField totalForceCauchy(sigmaPatch.size(), vector::zero);
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scalar totalNormalForceCauchy = 0.0;
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vector totalShearForceCauchy = vector::zero;
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if(nonLinear)
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{
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// Note: only for TL models, not correct for UL models yet - todo
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// We use two separate methods to calculate the force
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// for the nonlinear models
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// both methods should be equivalent
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// they are both used just to check everything is as it should be
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// Force == currentAreas & sigmaCauchy == referenceArea & sigma2PK & deformationGradient
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// deformation gradient
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tensorField F = I + gradUPtr->boundaryField()[patchID];
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const scalarField J = det(F);
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const tensorField Finv = hinv(F);
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// current deformed patch area vectors are given by Nanson's formula
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const vectorField deformedSf = J * Finv & Sf;
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const vectorField deformedN = deformedSf/mag(deformedSf);
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const symmTensorField& sigmaCauchyPatch = sigmaCauchyPtr->boundaryField()[patchID];
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// reference areas and 2nd Piola-Kirchhoff stress
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totalForce = Sf & (sigmaPatch & F);
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totalNormalForce = sum(deformedN & (totalForce));
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totalShearForce = sum((I -sqr(deformedN)) & (totalForce));
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// deformed normals and Cauchy stress
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totalForceCauchy = deformedSf & (sigmaCauchyPatch);
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totalNormalForceCauchy = sum(deformedN & (totalForceCauchy));
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totalShearForceCauchy = sum((I -sqr(deformedN)) & (totalForceCauchy));
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//netForceCauchy += sum(totalForceCauchy);
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}
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else
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{
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// small strain
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totalForce = Sf & sigmaPatch;
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totalNormalForce = sum(n & (totalForce));
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totalShearForce = sum((I -sqr(n)) & (totalForce));
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}
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//netForce += sum(totalForce);
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// scalar totalNormalForce = sum(n & (totalForce));
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// vector totalShearForce = sum((I -sqr(n)) & (totalForce));
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//maxPatchForce = max(maxPatchForce, mag(sum(totalForce)));
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Info << "Patch: " << mesh.boundary()[patchID].name() << nl
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<< "\tTotal Force:\t\t" << sum(totalForce) << " N\n"
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<< "\tTotal Normal Force:\t" << totalNormalForce << " N\n"
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<< "\tTotal Shear Force:\t" << totalShearForce << " N\n";
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if(nonLinear)
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{
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Info << "\tForces calculated with Cauchy stress\n"
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<< "\tTotal Force:\t\t" << sum(totalForceCauchy) << " N\n"
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<< "\tTotal Normal Force:\t" << totalNormalForceCauchy << " N\n"
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<< "\tTotal Shear Force:\t" << totalShearForceCauchy << " N\n";
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}
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Info << endl;
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}
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// scalar percentNetForce = 100.0*mag(netForce)/maxPatchForce;
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// scalar percentNetForceCauchy = 100.0*mag(netForceCauchy)/maxPatchForce;
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// Info << nl << "Net force on model is " << netForce << " N\twhich is "
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// << percentNetForce << "% of maximum patch force";
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// if(nonLinear)
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// Info << nl << "Net force (Cauchy method) on model is " << netForceCauchy << " N\twhich is "
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// << percentNetForceCauchy << "% of maximum patch force";
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Info << endl;
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}
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}
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Info << nl << "End" << endl;
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return 0;
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}
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// ************************************************************************* //
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