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-   -   Rotating geometries; approaches in CFD (http://www.cfd-online.com/Forums/main/12395-rotating-geometries-approaches-cfd.html)

 chuck October 12, 2006 08:58

Rotating geometries; approaches in CFD

Hello,

as far as I'm concerned rotating geometries are a very difficult problem in CFD because of the high mesh deformation. But what are the most common methods when we have rotating geometries such as impellers and so on?

Have a nice day!

Chuck

 sam October 12, 2006 10:03

Re: Rotating geometries; approaches in CFD

these are MRF and mixing plane

 chuck October 12, 2006 10:08

Re: Rotating geometries; approaches in CFD

Thanks sam. No I have sth. I can search for!

 chuck October 12, 2006 10:33

Re: Rotating geometries; approaches in CFD

typo: I wanted to write "Now I have sth. I can search for!"

 sam October 12, 2006 11:10

Re: Rotating geometries; approaches in CFD

ok :) search more for mixing plane and its development and let me know wat u understood then we can discuss a bit more

 chuck October 12, 2006 12:48

Re: Rotating geometries; approaches in CFD

Do you know any book or paper on this issue? It is very hard to find information on "mixing plane" or MRF via google. I can only find documents where there is said that a certain method was used, but without explanation.

 Ben October 12, 2006 13:04

Re: Rotating geometries; approaches in CFD

try rotating reference frame or similar but MRF is not the best approach to rotating geometries, its fairly good for easy quick results but is not as accurate as proper moving mesh. A better approach is to use either a sliding moving mesh or a deforming mesh where the connectivity at the rotating interface. This way the cells are re-defined as the mesh slides.

 Ben October 12, 2006 13:05

Re: Rotating geometries; approaches in CFD

 boling2002 October 12, 2006 15:58

Re: Rotating geometries; approaches in CFD

Besides the sliding mesh, one thing you can try is overset(chimera) grid.

 chuck October 13, 2006 09:24

Re: Rotating geometries; approaches in CFD

Hello, is mixing plane the same as sliding mesh?

 sam October 13, 2006 11:40

Re: Rotating geometries; approaches in CFD

no.

 dingxi October 14, 2006 09:51

Re: Rotating geometries; approaches in CFD

They are totally different, I think

 dingxi October 14, 2006 09:54

Re: Rotating geometries; approaches in CFD

For simulation of turbomachinery flow field with a stator and rotor, is there any chance to use sliding mesh or overset grid if the steady flow governing equations are to be solved?

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