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[ICEM] ICEM wind tunnel sign panel mesh

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Old   June 21, 2018, 10:11
Default ICEM wind tunnel sign panel mesh
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Hello,

I am trying to simulate a sign panel in a wind tunnel to find ways to reduce the wind load on the panel. My geometry includes a sign panel with holes in it. My problem is when I am in ICEM and I mesh, It meshes the entire signs and tries to eliminate the holes. My process is as follows:

1 - In auto-CAD I create the model with the enclosure and then subtract the sign panel from the enclosure so it is one model.

2 - I import into ICEM as a faceted STL > repair geometry > proceed to name the surfaces (inlet, outlet, walls, sign panel etc.)

3. - Generate body two point centroid (air click on sign and inlet) (sign click on two corners of the sign)

4 - When I go to mesh, it is a tetra mesh and everything looks good aside from the sign panel being completley meshed and not meshing around the holes.

I have tried the ANSYS workbench through design modeler and the meshing within workbench but it does not yield accurate results.

How can I mesh the sign to where it meshes around the holes in the sign. Or if there is a better way to mesh the entire system anything works as this is my first time using ICEM. I attached screen shots of what I have been getting

Thank you.
Attached Images
File Type: jpg Screenshot (1).jpg (76.0 KB, 23 views)
File Type: jpg Screenshot (2).jpg (195.0 KB, 18 views)

Last edited by tigerdroppings; June 21, 2018 at 17:53.
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Old   June 22, 2018, 03:49
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Isn't that because the mesh size at the hole is greater than the hole diameter? So how do you expect the hole curvature to be captured? Use a smaller mesh sizing locally at the sign holes (e.g. a local edge sizing).
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Old   June 29, 2018, 15:57
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Under what tab would this be under in ICEM. Thank you for your help this meshing is giving me alot of trouble.
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Old   June 30, 2018, 04:15
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You can use the Mesh / Global Mesh Size / Curvature Based Refinement or you can assign a local mesh sizing using Mesh / Curve Mesh Setup. It is useful to put such features into a Part and give it a useful name.
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Old   July 23, 2018, 13:23
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Quote:
Originally Posted by siw View Post
You can use the Mesh / Global Mesh Size / Curvature Based Refinement or you can assign a local mesh sizing using Mesh / Curve Mesh Setup. It is useful to put such features into a Part and give it a useful name.
Thanks for your help I was able to get it to work. Is there an easy way to a grid independence study for the mesh?
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Old   July 30, 2018, 13:28
Default grid independence
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Assuming that you have a coarse mesh,


Change the global scale factor from 1 to .5 and so on, leave everything else the same
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