[snappyHexMesh] Over refined mesh

user007 · December 5, 2019, 14:40

I am having difficulty in optimizing the mesh as I would like. In particular, the mesh is too refined where there are two neighboring surfaces, even if they have the normal facing opposite.

Referring to the attached image, the surfaces C and D are refined because they are close to each other.

The same thing happens for surfaces A and B, because they are close to each other, even if there is no fluid volume between the surfaces, and the have opposite normals.

Is there a way to prevent refinement between surfaces A and B?

Thanks!

Bazinga · December 6, 2019, 02:34

Not quite sure how your problem arises. You can define the level of refinement on surfaces in regions, etc, by yourself in snappyHexMesh. I have not yet had issues with automatic refinement that I did not decide on myself. You migh want to consider uploading your snappyHexMeshDict.

user007 · December 7, 2019, 04:40

Quote:

Originally Posted by Bazinga

Not quite sure how your problem arises. You can define the level of refinement on surfaces in regions, etc, by yourself in snappyHexMesh. I have not yet had issues with automatic refinement that I did not decide on myself. You migh want to consider uploading your snappyHexMeshDict.

hi Bazinga, please find attached the snappyHexMeshDict

Bazinga · December 7, 2019, 10:05

Well you have a refinementBox and 4 regions of a motorbike that are refined. You might want to adjust the dict file according to your case. User guide helpd here.

December 5, 2019, 14:40	Over refined mesh	#1
user007 New Member Join Date: Nov 2019 Posts: 13 Rep Power: 6	I am having difficulty in optimizing the mesh as I would like. In particular, the mesh is too refined where there are two neighboring surfaces, even if they have the normal facing opposite. Referring to the attached image, the surfaces C and D are refined because they are close to each other. The same thing happens for surfaces A and B, because they are close to each other, even if there is no fluid volume between the surfaces, and the have opposite normals. Is there a way to prevent refinement between surfaces A and B? Thanks!

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December 6, 2019, 02:34		#2
Bazinga Senior Member Join Date: Jun 2012 Location: Germany, Bochum Posts: 230 Rep Power: 15	Not quite sure how your problem arises. You can define the level of refinement on surfaces in regions, etc, by yourself in snappyHexMesh. I have not yet had issues with automatic refinement that I did not decide on myself. You migh want to consider uploading your snappyHexMeshDict.

December 7, 2019, 10:05		#4
Bazinga Senior Member Join Date: Jun 2012 Location: Germany, Bochum Posts: 230 Rep Power: 15	Well you have a refinementBox and 4 regions of a motorbike that are refined. You might want to adjust the dict file according to your case. User guide helpd here.