dynamic meshing with load balancing for hexahedral meshes in 3D and 2D
Library is based on:
Rettenmaier, Daniel, et al. "Load balanced 2D and 3D adaptive mesh refinement in OpenFOAM." SoftwareX 10 (2019): 100317.
link: https://www.sciencedirect.com/science/article/pii/S2352711018301699
port to the OpenFOAM+ version v1812 and v2006,v2012
refinement selection algoritm is based on foam extended 4.1
install OpenFOAM v1812
compile the library
./Allwmake
in case of v2006, v2012:
git checkout v2012
./Allwmake
Requires OpenFOAM v1812 or v2006,v2012:
https://www.openfoam.com/download/release-history.php
git clone https://github.com/HenningScheufler/multiDimAMR
cd multiDimAMR
./Allwmake
add following lines to the contolDict:
libs
(
"libdynamicLoadBalanceFvMesh.so"
);
or depending on the openfoam version
libs
(
dynamicLoadBalanceFvMesh
);
cat decomposeParDict
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: v1812 |
| \\ / A nd | Web: http://www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object decomposeParDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
numberOfSubdomains 4;
method scotch;
constraints
{
refinementHistoryMultiDim
{
//- Decompose cells such that all cell originating from single cell
// end up on same processor
type refinementHistoryMultiDim;
}
}
cat balanceParDict:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: v1812 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object balanceParDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
numberOfSubdomains 4;
method ptscotch; //clsutered //scotch
constraints
{
refinementHistoryMultiDim
{
//- Decompose cells such that all cell originating from single cell
// end up on same processor
type refinementHistoryMultiDim;
}
}
// ************************************************************************* //
the cells to refine are specified in the adaptCriteria dictionary
adaptCriteria
{
type fieldBounds; // options fieldBounds geometric
fieldName alpha.water;
lowerBound 0.001;
upperBound 0.999;
nLayer 2; // extends refinement zone by two layers
maxCellLevel 2; // default value very high number limits the maxium refinement level
minCellLevel 0; // default value 0 specify minimum refinement level
negate false; // default false // negates the selection
}
the composedAdaptCriteria enables us to combine the simple functions above by logial operator:
adaptCriteria
{
type composedAdaptCriteria;
operation or; // and or xor
criteria
(
interface // refine to the maxRefinement
{
type fieldBounds;
fieldName alpha.water;
lowerBound 0.01;
upperBound 0.99;
nLayer 2;
}
fluid // refLvl 2 in fluid
{
type fieldBounds;
fieldName alpha.water;
lowerBound 0.01;
upperBound 2;
maxCellLevel 2;
}
);
}
This way we can specify a higher refinement level at the interface than in the fluid or in combination with the geometric refinement option chose only to refine in a given region. Note that the composedAdaptCriteria can also consists of multiple composedAdaptCriteria
-
boundary condition that use function e.g. uniformFixedValue crash if the table function is used see issue #2
Solution: the issue can be resolved by switching to v2012
-
the load balancing crashes if a domain with no cells is created
Solution: use more cells or try a different method in balanceParDict kahip seems to work better than ptscotch I
This project is licensed under the GPL v3 License - see the LICENSE.md file for details
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