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

Re: Rotating geometries; approaches in CFD
 

these are MRF and mixing plane

Re: Rotating geometries; approaches in CFD
 

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

Re: Rotating geometries; approaches in CFD
 

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

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

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.

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.

Re: Rotating geometries; approaches in CFD
 

http://www.cd-adapco.com/press_room/...cs/23/mrf.html try that.....

Re: Rotating geometries; approaches in CFD
 

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

Re: Rotating geometries; approaches in CFD
 

Hello, is mixing plane the same as sliding mesh?

Re: Rotating geometries; approaches in CFD
 

no.

Re: Rotating geometries; approaches in CFD
 

They are totally different, I think

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?