| tommynego95 |
November 8, 2021 08:49 |
non-orthogonality problem
Hello all,
In the current study i'm following i need to mesh a complex body.
I decided to use snappyHexMesh since it has a good mesh capability and meshes with hexaedral elements.
The sHM process end with no problems exept the fact that i get a lot of non-orthogonals elements on my mesh, about 5000.
I don't get what i' m doing wrong
Here is the blockMeshDict file for the background mesh:
Code:
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 9
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
convertToMeters 0.001;
//x [-250;100]
//y [0;170]
//z [0;11.273]
vertices
(
(-300 0 0)
(500 0 0)
(500 300 0)
(-300 300 0)
(-300 0 11)
(500 0 11)
(500 300 11)
(-300 300 11)
);
blocks
(
hex (0 1 2 3 4 5 6 7) (80 30 11) simpleGrading (1 1 1)
edges
();
boundary
(
inlet
{
type patch;
faces
(
(0 3 7 4)
);
}
outlet
{
type patch;
faces
(
(1 2 6 5)
(7 6 2 3)
);
}
front_back
{
type empty;
faces
(
(0 3 2 1)
(5 6 7 4)
);
}
symmetry
{
type symmetryPlane;
faces
(
(0 1 5 4)
);
}
);
// ************************************************************************* //
The surfaceFeaturesDict
Code:
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 9
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
format ascii;
class dictionary;
object surfaceFeaturesDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
wall
{
surfaces ("wall.stl");
includedAngle 90;
geometricTestOnly yes;
writeObj yes;
}
porous_domain
{
surfaces ("porous_domain.stl");
includedAngle 90;
geometricTestOnly yes;
writeObj yes;
}
// ************************************************************************* //
and the snappyHexMeshDict
Code:
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 9
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
format ascii;
class dictionary;
object snappyHexMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
castellatedMesh true;
snap true;
addLayers true;
geometry
{
wall
{
type closedTriSurfaceMesh;
file "wall.stl";
}
porous_domain
{
type closedTriSurfaceMesh;
file "porous_domain.stl";
}
refinementBox
{
type searchableBox;
min (-0.3 0 0);
max (0.25 0.2 0.011);
}
};
// Settings for the castellatedMesh generation.
castellatedMeshControls
{
// Refinement parameters
// ~~~~~~~~~~~~~~~~~~~~~
maxLocalCells 100000000;
maxGlobalCells 200000000;
minRefinementCells 10;
maxLoadUnbalance 0.10;
nCellsBetweenLevels 2;
// Explicit feature edge refinement
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
features
(
{
file "wall.eMesh";
levels ((2 3));
}
{
file "porous_domain.eMesh";
levels ((2 2));
}
);
// Surface based refinement
// ~~~~~~~~~~~~~~~~~~~~~~~~
refinementSurfaces
{
wall
{
level (0 0);
patchInfo
{
type wall;
}
}
porous_domain
{
level (2 2);
faceZone porous_domain;
cellZone porous_domain;
cellZoneInside inside;
boundary internal;
patchInfo
{
type patch;
}
}
}
resolveFeatureAngle 30;
// Region-wise refinement
// ~~~~~~~~~~~~~~~~~~~~~~
refinementRegions
{
refinementBox
{
mode inside;
level 1;
}
}
// Mesh selection
// ~~~~~~~~~~~~~~
locationInMesh (-0.25 0.001 0.005);
allowFreeStandingZoneFaces true;
}
// Settings for the snapping.
snapControls
{
nSmoothPatch 5;
tolerance 4.0;
nSolveIter 100;
nRelaxIter 5;
// Feature snapping
nFeatureSnapIter 30;
implicitFeatureSnap false;
explicitFeatureSnap true;
multiRegionFeatureSnap false;
}
// Settings for the layer addition.
addLayersControls
{
relativeSizes false;
layers
{
wall
{
nSurfaceLayers 5;
}
}
expansionRatio 1.2;
finalLayerThickness 0.2;
minThickness 0.1;
nGrow 0;
featureAngle 30;
slipFeatureAngle 30;
nRelaxIter 3;
nSmoothSurfaceNormals 1;
nSmoothNormals 3;
nSmoothThickness 10;
maxFaceThicknessRatio 0.5;
maxThicknessToMedialRatio 0.3;
minMedianAxisAngle 90;
nBufferCellsNoExtrude 0;
nLayerIter 50;
}
meshQualityControls
{
#include "meshQualityDict"
}
debug 1;
writeFlags
(
scalarLevels
layerSets
layerFields
);
mergeTolerance 1e-6;
// ************************************************************************* //
I also attach the .stl files so if anybody wants to help.
The .stl files are exported from a geometry i modeled in salome. |
