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CFX Import from ANSA - Isolated Volumes

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Old   May 20, 2016, 16:17
Default CFX Import from ANSA - Isolated Volumes
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Hi everybody,

I would like to run an external aerodynamics simulation on a Formula Student car and rather then using the conventional Ansys mesher (which from my point of view is just terrible) I decided to generate the volume mesh in ANSA and import it afterwards to CFX.

I created a tet-mesh with prism layers to resolve the boundary layer and exported it as a cfx5 file.
After successful import of the mesh however, a boundary in the 2D regions shows up that represents the transition from the Tet-mesh to the prism layers. Obviously, if I leave this surface in the default region, I end up with isolated volumes (see attached screenshot). I have already tried assigning the same PID in Ansa to the entire volume mesh, without any success.

Does anybody have an idea how to bypass or solve that problem?
I'd greatly appreciate any advice!
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File Type: png Isolated Volumes.PNG (41.6 KB, 13 views)
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Old   May 21, 2016, 06:14
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Glenn Horrocks
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It appears your mesh has one volume which is entirely tets (right to the wall) and another volume which is the prism layer. These volumes overlap. This is not an acceptable CFX mesh, you are going to have to go back to your mesher and regenerate it such that it is one contiguous mesh. While ANSYS mesher is not my favourite mesher either, it does not give you unusable meshes like that
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Old   May 24, 2016, 10:05
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Quote:
Originally Posted by ghorrocks View Post
It appears your mesh has one volume which is entirely tets (right to the wall) and another volume which is the prism layer. These volumes overlap. This is not an acceptable CFX mesh, you are going to have to go back to your mesher and regenerate it such that it is one contiguous mesh. While ANSYS mesher is not my favourite mesher either, it does not give you unusable meshes like that
Of course, quite obvious actually!
Thanks for the quick reply and help
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Old   June 1, 2016, 12:47
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Vangelis Skaperdas
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Just a quick comment
The problem occurred due to the fact that you used
Volumes>Define>AutoDetect without having the topcap of the layers
visible (possibly the visibility flag of FE-mod mesh was off)
so ANSA detected a volume right down to the base surface mesh
of the layers)

Whenever you use Detect volume ensure all is visible.

hope this helps
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