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[ANSYS Meshing] Inflation layers getting "squeezed"

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Old   August 24, 2024, 07:53
Default Inflation layers getting "squeezed"
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Isaac
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Hello. I am doing a 3D mesh of an airfoil with a vortex generator to simulate in Fluent (M<0.3, so assuming incompressible).

The mesh is a very thin slice of the aerofoil cross section (25mm accross) with one vortex generator.

No matter what I do, I can not seem to keep the mesh from "squeezing" the inflation layers in the area around the vortex generator. I have tried modifying the selections for the different face sizings and for the inflation control to no avail. I get the stairstep mesh warning which may be related, but not sure what to do to fix it.

Screenshots of mesh and details pane are attached.
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File Type: png close up.png (23.1 KB, 19 views)
File Type: png Full domain.png (78.0 KB, 21 views)
File Type: png VG close up.png (68.7 KB, 16 views)
File Type: png mesh details.png (23.5 KB, 14 views)
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Old   August 27, 2024, 07:05
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Gert-Jan
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Is it really unwanted?
What you can try is to put the vortex generator in a separate volume. Then first mesh the outer volume and then this separate inner volume.
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Old   August 28, 2024, 03:02
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Could you provide any guidance on how to do this? I understand how to mesh two different volumes, but is it then a case of simply defining them both as fluid domains in Fluent when when I set up the case?

Last edited by Speedbird1; August 28, 2024 at 03:02. Reason: Grammar
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Old   August 28, 2024, 03:20
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When creating the geometry with 2 volumes, you need to make sure they share faces. In Spaceclaim, you can enforce this with the share-button in the Workbench-settings

If everything went okay, the workbench mesher will show you 1 surface between the volumes since it is shared. Don't name the surface. Just leave them there. or hide them if they are annoying. If you see two faces on the same location, the sharing went wrong. Then redo the geometry are share again.

Then first mesh the outer volume, then the inner volume.
In CFX you can simply import the mesh. CFX will ignore the shared faces.

Fluent I don't know. I try to avoid it as much as possible. But probably it will ignore the shared faces as well. Otherwise you have to defines interfaces.
___________

But what make you think, the meshing is wrong? Is it too fine for the turbulence model?
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Old   September 2, 2024, 03:25
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Quote:
Originally Posted by Gert-Jan View Post

But what make you think, the meshing is wrong? Is it too fine for the turbulence model?

I'm studying vortex generation in the boundary layer so I want a very fine mesh near the surface. I'm finding it very difficult to get y+ down to around 1 on the VG face and I think this may be the cuplrit.
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