CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   OpenFOAM (http://www.cfd-online.com/Forums/openfoam/)
-   -   snappyHexMesh (http://www.cfd-online.com/Forums/openfoam/68970-snappyhexmesh.html)

tachyon_me October 7, 2009 14:01

snappyHexMesh
 
I'm running snappyHexMesh for a complex model which takes really long iterating back and forth for meeting all the mesh quality criteria.

meshQualityControls
{
maxNonOrtho 75;
maxBoundarySkewness 30;
maxInternalSkewness 4;
maxConcave 85;
minFlatness 0.5;
minVol 1e-13;
minArea -1;
minTwist 0.05;
minDeterminant 0.001;
minFaceWeight 0.025;
minVolRatio 0.01;
minTriangleTwist 0.05;
nSmoothScale 4;
errorReduction 0.75;


I would like to speed up the meshing process. Please let me know your opinion if anything can be done to speed up meshing.

another things I would like to do the volume mesh fixing. Once I get the final mesh checkMesh utility pop up some bad cells >200 , Is there any way I can delete the bad cells before I run the solver or create the patch.

checkMesh utility i guess outputs the faces as warped etc ... I know i can bring out the cell attached with those faces with
faceToCell any / ....

Once I have all those bad cell in a set file How to operate them on the final mesh written 3/
Cell c0 delete .....

Finally My goal is to get the mesh without any of those bad cells.

Highly appreciate any help ...

santos October 7, 2009 18:49

You could speed up your meshing process by running sHM in parallel (I normally run it on 4 CPUs).

Regards,
Jose Santos

tachyon_me October 7, 2009 19:54

Thanks ! I have been running parallel...

I see some kind of cell count boosts compared to other meshing tools ... I'm not 100% sure but I guess for similar kind of surface meshing and extrusion layer set up.... snappyHexMesh generates huge number of cells ....

Do u have any idea if I can fix the mesh after taking out the cells which normally pop up in checkMesh utility...

santos October 8, 2009 10:10

I am sorry but I dont have any experience on how to do that. Maybe you could increase your mesh quality parameters in snappyHexMeshDict so you dont end up with those bad cells.

Regards,
Jose Santos


All times are GMT -4. The time now is 12:20.