# Rotating geometries; approaches in CFD

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 October 12, 2006, 08:58 Rotating geometries; approaches in CFD #1 chuck Guest   Posts: n/a 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

 October 12, 2006, 10:03 Re: Rotating geometries; approaches in CFD #2 sam Guest   Posts: n/a these are MRF and mixing plane

 October 12, 2006, 10:08 Re: Rotating geometries; approaches in CFD #3 chuck Guest   Posts: n/a Thanks sam. No I have sth. I can search for!

 October 12, 2006, 10:33 Re: Rotating geometries; approaches in CFD #4 chuck Guest   Posts: n/a typo: I wanted to write "Now I have sth. I can search for!"

 October 12, 2006, 11:10 Re: Rotating geometries; approaches in CFD #5 sam Guest   Posts: n/a ok search more for mixing plane and its development and let me know wat u understood then we can discuss a bit more

 October 12, 2006, 12:48 Re: Rotating geometries; approaches in CFD #6 chuck Guest   Posts: n/a 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.

 October 12, 2006, 13:04 Re: Rotating geometries; approaches in CFD #7 Ben Guest   Posts: n/a 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.

 October 12, 2006, 13:05 Re: Rotating geometries; approaches in CFD #8 Ben Guest   Posts: n/a

 October 12, 2006, 15:58 Re: Rotating geometries; approaches in CFD #9 boling2002 Guest   Posts: n/a Besides the sliding mesh, one thing you can try is overset(chimera) grid.

 October 13, 2006, 09:24 Re: Rotating geometries; approaches in CFD #10 chuck Guest   Posts: n/a Hello, is mixing plane the same as sliding mesh?

 October 13, 2006, 11:40 Re: Rotating geometries; approaches in CFD #11 sam Guest   Posts: n/a no.

 October 14, 2006, 09:51 Re: Rotating geometries; approaches in CFD #12 dingxi Guest   Posts: n/a They are totally different, I think

 October 14, 2006, 09:54 Re: Rotating geometries; approaches in CFD #13 dingxi Guest   Posts: n/a 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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