[snappyHexMesh] Bad layer formation

r.cabral · April 10, 2023, 12:30

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, 04:58

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, 12:30	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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Boundary Layer Mesh must cover the whole thickness of BL	sasanghomi	CFX	2	June 11, 2019 22:16
[snappyHexMesh] Bad meshing result on corrugated metal sheet	UebertreibeR	OpenFOAM Meshing & Mesh Conversion	1	August 19, 2016 05:55
[snappyHexMesh] Boundary layer in a pipe	Clementhuon	OpenFOAM Meshing & Mesh Conversion	6	March 12, 2012 13:41
[snappyHexMesh] Boundary layer generation problems	ivan_cozza	OpenFOAM Meshing & Mesh Conversion	0	October 6, 2010 14:47
Problems of Duns Codes!	Martin J	Main CFD Forum	8	August 15, 2003 00:19

April 11, 2023, 04:58		#2
AtoHM Senior Member M Join Date: Dec 2017 Posts: 699 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.