[snappyHexMesh] Bad layer formation

r.cabral · April 10, 2023, 11:30

Does anyone know what is the likely reason that is causing those wrong layers in my mesh?

layers.jpg
bFuga.jpg

AtoHM · April 11, 2023, 03:58

Hello Rafael,

What you see in picture one appears to be a graphical issue of the crincle option in Paraview. The second image shows collapsing layers around an edge, which is a common problem in layer generation with snappyHexMesh. There are several forum posts here about such problems and there is not a singular answer that will help you right away. Best would be to use the search tool and cross reading some threads.
Here are a few things that help me from time to time: use relative instead of absolute layer thickness definition, increase addLayersControls>featureAngle or try the DisplacementMotionSolver mesh shrinker: https://www.openfoam.com/documentati...ntmotionsolver
This is only available in the ESI version of OpenFOAM and, as shown, not a definitive solution to the problem.
These are some glues, I hope it helps!

Good luck.

April 10, 2023, 11:30	Bad layer formation	#1
r.cabral New Member Rafael Join Date: Nov 2022 Posts: 2 Rep Power: 0	Does anyone know what is the likely reason that is causing those wrong layers in my mesh? layers.jpg bFuga.jpg

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April 11, 2023, 03:58		#2
AtoHM Senior Member M Join Date: Dec 2017 Posts: 649 Rep Power: 12	Hello Rafael, What you see in picture one appears to be a graphical issue of the crincle option in Paraview. The second image shows collapsing layers around an edge, which is a common problem in layer generation with snappyHexMesh. There are several forum posts here about such problems and there is not a singular answer that will help you right away. Best would be to use the search tool and cross reading some threads. Here are a few things that help me from time to time: use relative instead of absolute layer thickness definition, increase addLayersControls>featureAngle or try the DisplacementMotionSolver mesh shrinker: https://www.openfoam.com/documentati...ntmotionsolver This is only available in the ESI version of OpenFOAM and, as shown, not a definitive solution to the problem. These are some glues, I hope it helps! Good luck.