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[ICEM] Mesh body inside body

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Old   October 9, 2013, 06:41
Default Mesh body inside body
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Francisco
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Hi everybody,

I'm trying to mesh the following domain, see picture. It has one big volume called Fluid, then a prismatic volume called Shield inside it, and finally a body inside Shield called Body. All three are specified as bodies/mat point.

I need a tetrahedral mesh in Fluid and Shield, with Body as the empty space. When I generate the mesh selecting all geometry in the compute volume mesh panel just Fluid is meshed. I save this mesh and try just selecting Shield but it meshes Fluid again and again.
I've also tried to delete the Fluid part but it takes the whole volume as Shield, as it is included in it.

I'm thinking in deleting all Fluid curves and surfaces and mesh just the Shield part, and later on add the previous Fluid mesh and merge them with a conformal interface.

Is there a way to mesh the Shield volume without having to remove all the Fluid part elements?
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Old   October 9, 2013, 09:55
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Javi
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Hi Francisco,

I had to do something similar with my wind turbine project. My advice is that you donīt create the bodies before you try to do the mesh. I mean, when you try to mesh, for example, the "big volume called Fluid" choose in "compute volume mesh" the option "only visible" and try to see only the surfaces that creating this volume. Then compute the mesh. ICEM CFD will name it this part as Created_Material_33 for example (then you can change it). You can do this with all volumes you want.

Report if itīs works!
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Old   October 9, 2013, 12:53
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Hi FJSJ,

I tried what you say, there wasn't the option "only visible" in volume mesh but I could choose part by part. No material was created. Were you working with patch conforming shell mesh? Cause I'm working with non-conformal.

What I have done is the following:

I've generated one volume mesh for FLUID body and save the .uns file.
I've done the same for the SHIELD body and saved it too.
Then I've imported one into another and selected the merge option.
Finally, I've gone to Edit Mesh, Merge nodes, Merged volume meshes and selected the interface.
I've computed and then the interface is conformal.

I've followed the steps from the "Hybrid Tube" case in the Icem 11 Tutorial guide.
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Old   October 9, 2013, 13:31
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Hi Francisco,

yes you īre right. I did exactly the same approach as in tutorial "Hybrid Tube".

So.. have you solved your question, right?

But... I think if you try "merge mesh", ICEM CFD try to create transitional elements between the meshes, I mean, pyramidis... for that reason you say that the interface is conformal. But... donīt you want it conformal?
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Old   October 10, 2013, 04:38
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Quote:
Originally Posted by FJSJ View Post
So.. have you solved your question, right?
Yes, I solved it.

Quote:
But... I think if you try "merge mesh", ICEM CFD try to create transitional elements between the meshes, I mean, pyramidis... for that reason you say that the interface is conformal. But... donīt you want it conformal?
There is no transition generated, as far as I can see it just moves nodes on the surface to make them match, that is, to make the surface conformal.

And yes, that's what I wanted. The only thing is I wanted to know how to do it with a single mesh compute but this approach is rather simple too.
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