335 lines
9.1 KiB
C++
335 lines
9.1 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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Description
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Class describes a multiple body contact problem. Each individual contact
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is described by a contactPatchPair. contactProblem handles
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multiple contact updates and sets the boundary conditions on the
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displacement field.
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\*---------------------------------------------------------------------------*/
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#include "contactProblem.H"
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#include "fvMesh.H"
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#include "FieldFields.H"
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#include "directionMixedFvPatchFields.H"
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#include "surfaceFields.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
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defineTypeNameAndDebug(contactProblem, 0);
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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// Read constructor given IOobject
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contactProblem::contactProblem
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(
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volVectorField& U,
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const volTensorField& gradU
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)
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:
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IOdictionary
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(
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IOobject
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(
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"contactProperties",
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U.time().constant(),
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U.db(),
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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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contactPatchPairList(),
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U_(U),
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gradU_(gradU),
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urfValue_(readScalar(lookup("urfValue"))),
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urfTraction_(readScalar(lookup("urfTraction"))),
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urfFraction_(readScalar(lookup("urfFraction")))
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{
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// Read contactPatchPairList
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Istream& is = lookup("contacts");
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PtrList<entry> contactEntries(is);
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contactPatchPairList& contacts = *this;
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contacts.setSize(contactEntries.size());
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forAll(contacts, contactI)
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{
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contacts.set
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(
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contactI,
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new contactPatchPair
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(
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contactEntries[contactI].keyword(),
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*this,
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contactEntries[contactI].dict()
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)
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);
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}
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}
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// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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void contactProblem::correct()
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{
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contactPatchPairList& contacts = *this;
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// Create fields for accumulation
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volVectorField::GeometricBoundaryField& Upatches = U().boundaryField();
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FieldField<Field, vector> curTraction(Upatches.size());
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FieldField<Field, vector> newTraction(Upatches.size());
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FieldField<Field, vector> refValue(Upatches.size());
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FieldField<Field, scalar> valueFraction(Upatches.size());
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forAll (Upatches, patchI)
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{
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curTraction.set
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(
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patchI,
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new vectorField(Upatches[patchI].size(), vector::zero)
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);
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newTraction.set
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(
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patchI,
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new vectorField(Upatches[patchI].size(), vector::zero)
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);
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refValue.set
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(
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patchI,
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new vectorField(Upatches[patchI].size(), vector::zero)
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);
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valueFraction.set
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(
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patchI,
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new scalarField(Upatches[patchI].size(), 0)
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);
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}
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// Collect patches involved in contact
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boolList contactPatches(Upatches.size(), false);
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forAll (contacts, contactI)
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{
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contactPatches[contacts[contactI].masterPatch().index()] = true;
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contactPatches[contacts[contactI].slavePatch().index()] = true;
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}
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// Calculate the traction for all involved patches
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// Collect fields
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const volTensorField::GeometricBoundaryField& gradUpatches =
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gradU().boundaryField();
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const surfaceVectorField::GeometricBoundaryField& Apatches =
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mesh().Sf().boundaryField();
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const surfaceScalarField::GeometricBoundaryField& magApatches =
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mesh().magSf().boundaryField();
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// Lookup mu and lambda form object registry
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const volScalarField& mu =
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mesh().objectRegistry::lookupObject<volScalarField>("mu");
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const volScalarField::GeometricBoundaryField& muPatches =
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mu.boundaryField();
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const volScalarField& lambda =
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mesh().objectRegistry::lookupObject<volScalarField>("lambda");
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const volScalarField::GeometricBoundaryField& lambdaPatches =
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lambda.boundaryField();
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forAll (Upatches, patchI)
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{
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if (contactPatches[patchI])
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{
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vectorField nPatch = Apatches[patchI]/magApatches[patchI];
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curTraction[patchI] =
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nPatch &
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(
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muPatches[patchI]*
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(
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gradUpatches[patchI]
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+ gradUpatches[patchI].T()
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)
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+ I*(lambdaPatches[patchI]*tr(gradUpatches[patchI]))
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);
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}
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}
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// Accumulate contact data and active patches
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forAll (contacts, contactI)
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{
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contacts[contactI].correct
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(
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curTraction,
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newTraction,
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refValue,
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valueFraction
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);
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}
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// Enforce accumulated contact onto the patches
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forAll (Upatches, patchI)
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{
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if (contactPatches[patchI])
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{
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// Cast the patch into direction mixed type
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directionMixedFvPatchVectorField& curUPatch =
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refCast<directionMixedFvPatchVectorField>(Upatches[patchI]);
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// Set the values using under-relaxation
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curUPatch.refValue() =
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(1.0 - urfValue_)*curUPatch.refValue()
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+ urfValue_*refValue[patchI];
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// Calculate the gradient from under-relaxad accumulated traction
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vectorField nPatch = Apatches[patchI]/magApatches[patchI];
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curUPatch.refGrad() =
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(
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(1.0 - urfTraction_)*curTraction[patchI]
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+ urfTraction_*newTraction[patchI]
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- (nPatch &
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(
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muPatches[patchI]*gradUpatches[patchI].T()
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- (
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muPatches[patchI]
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+ lambdaPatches[patchI]
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)*gradUpatches[patchI]
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)
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)
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- nPatch*
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(
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lambdaPatches[patchI]*tr(gradUpatches[patchI])
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)
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)/(2.0*muPatches[patchI] + lambdaPatches[patchI]);
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// Set the value fractions
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curUPatch.valueFraction() =
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(1.0 - urfFraction_)*curUPatch.valueFraction()
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+ I*urfFraction_*valueFraction[patchI];
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}
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}
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}
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tmp<volScalarField> contactProblem::contactArea() const
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{
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tmp<volScalarField> tca
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(
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new volScalarField
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(
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IOobject
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(
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"contactArea",
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U().time().timeName(),
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U().db(),
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IOobject::NO_READ,
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IOobject::AUTO_WRITE
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),
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mesh(),
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dimensionedScalar(0)
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)
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);
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volScalarField& ca = tca();
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// Set contact area boundary
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const contactPatchPairList& contacts = *this;
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forAll (contacts, contactI)
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{
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// Get master contact
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ca.boundaryField()[contacts[contactI].masterPatch().index()] +=
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contacts[contactI].masterTouchFraction();
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// Get slave contact
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ca.boundaryField()[contacts[contactI].slavePatch().index()] +=
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contacts[contactI].slaveTouchFraction();
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}
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return tca;
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}
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// Return a list of contactPatchPair names
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wordList contactProblem::names() const
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{
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const contactPatchPairList& contacts = *this;
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wordList t(contacts.size());
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forAll (contacts, contactI)
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{
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t[contactI] = contacts[contactI].name();
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}
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return t;
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}
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bool contactProblem::read()
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{
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if (regIOobject::read())
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{
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urfValue_ = readScalar(lookup("urfValue"));
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urfTraction_ = readScalar(lookup("urfTraction"));
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urfFraction_ = readScalar(lookup("urfFraction"));
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// Decided not to re-read contactPatchPairList. HJ, 10/Jul/2004
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return true;
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}
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else
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{
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return false;
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}
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}
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// * * * * * * * * * * * * * * * IOstream Operators * * * * * * * * * * * * //
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace Foam
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// ************************************************************************* //
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