[lolagony]

Im investigating a T-Junction. Trying to resolve the boundary layer i get weird behaviour of the layers around the edges. Does anyone have a suggestion which parameters of the snappyHexMeshDict i should play with? Or does anyone see another way of meshing opensourcewise (mesh needs to be compatible with OpenFOAM)?



/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 11
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
format ascii;
class dictionary;
object snappyHexMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

// Which of the steps to run
castellatedMesh true;
snap true;
addLayers true;

// Geometry. Definition of all surfaces. All surfaces are of class
// searchableSurface.
geometry
{
miniChannelWand.stl
{
type triSurfaceMesh;
name miniChannelWand;
}

miniChannelUnten.stl
{
type triSurfaceMesh;
name miniChannelUnten;
}

manifoldLinks.stl
{
type triSurfaceMesh;
name manifoldLinks;
}

manifoldRechts.stl
{
type triSurfaceMesh;
name manifoldRechts;
}

manifoldLinksWand.stl
{
type triSurfaceMesh;
name manifoldLinksWand;
}

manifoldRechtsWand.stl
{
type triSurfaceMesh;
name manifoldRechtsWand;
}
}

// Settings for the castellatedMesh generation.
castellatedMeshControls
{
maxLocalCells 100000000;
maxGlobalCells 200000000;
minRefinementCells 10;
maxLoadUnbalance 0.10;
nCellsBetweenLevels 10;

features
(
{
file "miniChannelWand.eMesh";
level 0;
}
{
file "miniChannelUnten.eMesh";
level 0;
}
{
file "manifoldLinks.eMesh";
level 0;
}
{
file "manifoldRechts.eMesh";
level 0;
}
{
file "manifoldLinksWand.eMesh";
level 0;
}
{
file "manifoldRechtsWand.eMesh";
level 0;
}
);

refinementSurfaces
{
miniChannelWand
{
level (2 2);
}

miniChannelUnten
{
level (0 0);
}

manifoldLinks
{
level (0 0);
}

manifoldRechts
{
level (0 0);
}
manifoldLinksWand
{
level (2 2);
}
manifoldRechtsWand
{
level (2 2);
}
}

resolveFeatureAngle 30;
planarAngle 30;

refinementRegions
{
}

locationInMesh (0.25 0 0);
allowFreeStandingZoneFaces true;
extendedRefinementSpan true;
}

snapControls
{
nSmoothPatch 3;
tolerance 2.0;
nSolveIter 30;
nRelaxIter 5;
nFeatureSnapIter 10;
implicitFeatureSnap false;
explicitFeatureSnap true;
multiRegionFeatureSnap false;
}

addLayersControls
{
relativeSizes false;
expansionRatio 1.2;
firstLayerThickness 0.000005;
//thickness 0.0005;
minThickness 0.000001;

layers
{
miniChannelWand
{
nSurfaceLayers 20;
}
manifoldLinksWand
{
nSurfaceLayers 20;
}
manifoldRechtsWand
{
nSurfaceLayers 20;
}
}

nGrow 0;
featureAngle 130;
maxFaceThicknessRatio 0.5;
nSmoothSurfaceNormals 1;
nSmoothThickness 10;
minMedialAxisAngle 90;
maxThicknessToMedialRatio 0.3;
nSmoothNormals 3;
slipFeatureAngle 30;
nRelaxIter 5;
nBufferCellsNoExtrude 0;
nLayerIter 50;
nRelaxedIter 20;
}

meshQualityControls
{
#include "meshQualityDict"

relaxed
{
maxNonOrtho 75;
}
}

mergeTolerance 1e-6;