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Old   April 24, 2008, 16:53
Default ICEM CFD - Multiple domains
  #1
Laurenjiongo
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HI

I would like to simulate the flow around a wind turbine blade. For this purpose, my computational domain consist of two domains (rotating and stationary) which will be connected through interfaces.

I have used ICEM CFD O-blocks to mesh the rotating zone (located inside the stationary). But I don't know how to proceed with the stationary.

As associations are made between blocks edges/faces and curves/surfaces, should I use same surfaces as interfaces for the two domains or use different surfaces for each zone?

I have tried this without success : blocking associations==>face to surface ===> shared wall

Please I need your help.

Thanks for your suggestions.

P.s : Sorry for my english.
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Old   April 28, 2008, 08:14
Default Re: ICEM CFD - Multiple domains - HEELLLLLLLLLLPPP
  #2
Laurenjiongo
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HELLLLLLLLLLLLLLLLLPPPPPPPPPPPPPPPPPPP!!!!!!!!!!!! !!!!!!

Maybe I'm not explaining my problem as it is? Well I do it once again.

I have two fluid zone to mesh. One is the stationary zone and the second rotating. In my geometry, they share the same cure, but each zone has his own surfaces.

At this point I'm confused:

1. should I mesh them part (I mean zone)by part so I will use two mesh file in the CFX-pre?

2.It is possible to mesh them together (in order to have surfaces meshes at the interfaces similar as possible)using blocks ?

Pleeeeeeeaaaaaaase a desparate guy need your help. Thanks.

Ps. Sorry for my english.

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Old   April 28, 2008, 11:21
Default Re: ICEM CFD - Multiple domains - HEELLLLLLLLLLPPP
  #3
Andrew
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When creating blocking in ICEM you can assign different blocks to different families. These families will show up as separate 3D regions when imported into CFX Pre.

If you convert your hex mesh to an "unstruct" mesh, ICEM has a tool (Edit Mesh -> Repair Mesh -> Flood Fill/Make consistent -> Make Volume Mesh Consistent With Surface Mesh) to conform the 2 mesh regions. You just select the shared surfaces and ICEM will do whatever it can to fit them together. I've never tried it on 2 hex regions before. It may create degenerate cells between the 2 volumes. Once it's done you can delete the shells from the interface surface and you will have a conformal mesh.
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Old   April 28, 2008, 12:00
Default Re: ICEM CFD - Multiple domains - HEELLLLLLLLLLPPP
  #4
Laurenjiongo
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Dear ANDREW,

Thanks a lot for your answer.

By "assigning differents blocks to differents families" I understand that after splitting blocks I can add them to different parts and turn them on/off whenever and wherever it's needed. It's right? I will try to do it.

Have a nice day.

Ps. Sorry for my english.

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Old   May 6, 2008, 06:42
Default Re: ICEM CFD - Multiple domains - HEELLLLLLLLLLPPP
  #5
Laurenjiongo
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THANKS VERY MUCH ANDREW;

I've finally got it. I used for each domain an assembly in which I put both the geometry (surfaces,curves and points) and the blocking materials. Flood fill/make consistent didn't worked perfectly but as only the curves were shared, I had just to mesh one domain with the other turned off.

The mesh isn't perfectly conformal but it's not matter, I'll use the GGI grid connectivity.

One more time,thanks a lot. You save my day (I mean my months of urge suffering).

Ps. "Sorry for my english".
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