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[snappyHexMesh] snappyHexMesh problem

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Old   April 22, 2014, 21:16
Default snappyHexMesh problem
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Sergey
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Hello!

Can any one tell me what does this message mean:

Code:
--> FOAM FATAL ERROR: 
cell 15802 of level 0 does not seem to have 8 points of equal or lower level
cellPoints:5(17411 17412 17432 17433 17640)
pointLevels:5{0}


From function hexRef8::setRefinement(const labelList&, polyTopoChange&)
in file polyTopoChange/polyTopoChange/hexRef8.C at line 3770.
I how do I fix this problem?

Thank you!
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Old   April 23, 2014, 20:42
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Eric Bretscher
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It is a mesh topology error. I would suggest looking at the mesh refinement settings used or at the way the base mesh is first obtained. Surface-based refinement in particular is prone to introducing step changes in refinement levels close to the surface that can sometimes lead to further problems. Exceeding 2:1 refinement ratios is also asking for trouble and often leads to such errors with SHM.

SHM runs with the least issues when there is a nice consistent uniform body of hexahedral cells all around the surface(s). Look into distance-based refinement before snapping, trying to further refine hexes around features is not always such a good idea, etc.

It is usually not too hard to get good snapping around geometry with the latest version (OF2.3.0), the same can't be said about growing consistent layers from the surface in the next step unfortunately!!!

Last edited by seaspray; April 23, 2014 at 20:44. Reason: More precise
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