f97f6326f0
When snappyHexMesh is run in parallel it re-balances the mesh during refinement
and layer addition by redistribution which requires a decomposition method
that operates in parallel, e.g. hierachical or ptscotch. decomposePar uses a
decomposition method which operates in serial e.g. hierachical but NOT
ptscotch. In order to run decomposePar followed by snappyHexMesh in parallel it
has been necessary to change the method specified in decomposeParDict but now
this is avoided by separately specifying the decomposition and distribution
methods, e.g. in the incompressible/simpleFoam/motorBike case:
numberOfSubdomains 6;
decomposer hierarchical;
distributor ptscotch;
hierarchicalCoeffs
{
n (3 2 1);
order xyz;
}
The distributor entry is also used for run-time mesh redistribution, e.g. in the
multiphase/interFoam/RAS/floatingObject case re-distribution for load-balancing
is enabled in constant/dynamicMeshDict:
distributor
{
type distributor;
libs ("libfvMeshDistributors.so");
redistributionInterval 10;
}
which uses the distributor specified in system/decomposeParDict:
distributor hierarchical;
This rationalisation provides the structure for development of mesh
redistribution and load-balancing.
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration | Website: https://openfoam.org
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\\ / A nd | Copyright (C) 2011-2021 OpenFOAM Foundation
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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
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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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\*---------------------------------------------------------------------------*/
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#include "domainDecomposition.H"
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#include "decompositionMethod.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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void Foam::domainDecomposition::distributeCells()
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{
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Info<< "\nCalculating distribution of cells" << endl;
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cpuTime decompositionTime;
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const dictionary decomposeParDict
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(
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decompositionMethod::decomposeParDict(time())
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);
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scalarField cellWeights;
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if (decomposeParDict.found("weightField"))
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{
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const word weightName = decomposeParDict.lookup("weightField");
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volScalarField weights
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(
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IOobject
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(
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weightName,
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time().timeName(),
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*this,
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IOobject::MUST_READ,
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IOobject::NO_WRITE
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),
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*this
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);
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cellWeights = weights.primitiveField();
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}
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cellToProc_ =
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decompositionMethod::NewDecomposer(decomposeParDict)
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->decompose(*this, cellWeights);
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Info<< "\nFinished decomposition in "
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<< decompositionTime.elapsedCpuTime()
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<< " s" << endl;
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}
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// ************************************************************************* //
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