not capturing feature edges
2 Attachment(s)
Dear all,
I have recently started to get into SHM but am having problems with not being able to resolve component edges cleanly and not being able to snap to them. I am trying to mesh a fan and getting these problems on the trailing edge.
with surfaceFeatures i am capturing the edges by defining an angle. With paraview i checked if i got the edges of interest correctly (attached PNG, red lines are from the .obj, grey is the stl body). This does all seem correct.
in shmDict i use castellatedMeshControls / features to refine around those edges
Here's my surfaceFeaturesDict code
Code:
FoamFile
{
format ascii;
class dictionary;
object surfaceFeaturesDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
surfaces ("fan.stl");
includedAngle 130;
writeObj yes;
snappyHexMeshDict:
Code:
FoamFile
{
format ascii;
class dictionary;
object snappyHexMeshDict;
}
castellatedMesh true;
snap true;
addLayers false;
geometry
{
fan
{
type triSurfaceMesh;
file "fan.stl";
}
};
castellatedMeshControls
{
maxLocalCells 1000000;
maxGlobalCells 20000000;
minRefinementCells 0;
nCellsBetweenLevels 1;
features
(
{
file "fan.extendedFeatureEdgeMesh";
level 5;
}
);
refinementSurfaces
{
fan
{
// Surface-wise min and max refinement level
level (4 4);
}
}
resolveFeatureAngle 30;
locationInMesh (0.00 0.00 0.27); // Inside point
allowFreeStandingZoneFaces true;
}
snapControls
{
nSmoothPatch 3;
tolerance 1.0;
nSolveIter 300;
nRelaxIter 5;
nFeatureSnapIter 30;
implicitFeatureSnap false;
explicitFeatureSnap true;
multiRegionFeatureSnap false;
}
.
.
.
I tryed to get a better solution with different settings - played around with level of "fan.extendedFeatureEdgeMesh" from 5 to 10
- different refinement levels on surface
At first i thought it might be a problem with the very thin surface on the trailing edge, but i also get crinkles on the edges of the airfoil profile itself.
Do the more experienced users still have one or two tips that I could test? I would be very happy about any help.
Thanks. |
