[blockMesh] How to make a cylinder mesh that the cells dense inside and sparse outside

Allen_Huang · April 11, 2024, 10:33

How to make a cylinder mesh that is Dense inside and sparse outside, I have try this video but there were some error when I used checkMesh. https://youtu.be/3v50ev75aDw?si=LvcrGvT77deIaMp1

AtoHM · April 12, 2024, 05:59

If I understand your target correctly, you cannot do that with blockMesh alone. It is very basic with snappyHexMesh, though. Just create a big blockMesh (cube) with the spacing you want to have "on the outside" and then you can use a searchableCylinder source in snappyHexMesh (defined in the geometry section of the snappyHexMeshDict) and add a volumetric refinement for that region inside the refinementRegions section of the snappyHexMeshDict. This is a very basic thing and should be easily found in tutorials online.

April 11, 2024, 10:33	How to make a cylinder mesh that the cells dense inside and sparse outside	#1
Allen_Huang New Member Huang, Ching-Chan Join Date: Jan 2023 Posts: 16 Rep Power: 3	How to make a cylinder mesh that is Dense inside and sparse outside, I have try this video but there were some error when I used checkMesh. https://youtu.be/3v50ev75aDw?si=LvcrGvT77deIaMp1

April 12, 2024, 05:59		#2
AtoHM Senior Member M Join Date: Dec 2017 Posts: 703 Rep Power: 13	If I understand your target correctly, you cannot do that with blockMesh alone. It is very basic with snappyHexMesh, though. Just create a big blockMesh (cube) with the spacing you want to have "on the outside" and then you can use a searchableCylinder source in snappyHexMesh (defined in the geometry section of the snappyHexMeshDict) and add a volumetric refinement for that region inside the refinementRegions section of the snappyHexMeshDict. This is a very basic thing and should be easily found in tutorials online.