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vmlxb6 August 30, 2012 10:31

structural + fluid meshing
Hello everyone,

I am trying to mesh the region of an exhaust manifold for structural as well as fluid simulation. Now I have been told that everything in the IGES model needs to be meshed. The problem is that the model consists of fluid region + the structural region with bolts and washers and spacers.
I have always used ICEM for CFD and never for structural purpose. I am not sure how I should go about doing this. Are there any tutorials available for meshing multiple components together.
I would have managed if it was just the structure or just the fluid region but now its the fluid as well as the structure with bolt and washers.

Any kind of advice would be appreciated. Thank you very much.



BrolY August 31, 2012 11:15

Hexa or Tetra ?

You can use multiple Bodies for tetra mesh.
you can use multiple parts (such as solid, fluid, etc ..) for the blocking method and put the blocks inside the parts you want.

vmlxb6 September 4, 2012 16:05

I would like to use tetra because of the complexity of the geometry. Are there any tutorials available that show how to go about doing this ?

Also when I import the geometry in ICEM in the IGES format, the imported geometry shows all the surfaces as one entity. Is there a way to segregate them automatically ? I mean when I import my geom, I would like it as separate bodies (washer, bolt...etc) rather than just one combined single surface entity.
Thank you very much.

stuart23 September 4, 2012 20:17

I dont think IGES files can have different "parts". STEP files can however. You could export the CAD as two seperate files and import one after the other, just make sure you click "Merge" geometry rather than "Replace" when you import the second geometry.

If you have multiple bodies, make sure you insert a material point into each body. That way ICEM will know that you want two seperate volume meshes.


diamondx September 5, 2012 09:08

IGES files can have differents parts. i can confirm that. just tried yesterday...

diamondx September 5, 2012 09:12

i became familiar with Ansys design modeler recently and i can assure that it is a great tool to repair geometry. Just like ICEM, it just has a user friendly gui . If you import your IGES in designmoder. all the part will be apart, you can then use a boolean operation to unite them, or use a "body operation" to delete one of them. try it it's very simple.
You also have traning material for Ansys designmoder it's really worth it to do them...

stuart23 September 5, 2012 10:27


IGES files can have differents parts. i can confirm that. just tried yesterday...
Sorry vmlxb6, diamondx, I stand corrected

Far September 5, 2012 10:54

you both are correct. IGES can have different parts but under same name. So you need to assign them names in ICEM (right click on parts )

vmlxb6 September 5, 2012 16:45

Thank you everyone for your reply. I realize that I would have to create multiple parts by selecting the individual surfaces. I was hoping that if by some means I could just import it as different part it would make my life easier.
so once I mesh all the different parts individually do I have to make contact surfaces for structural analysis ???

If there is any tutorial available that would be really nice. Thank you all for your input.

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