# Rotating domain motion in cfx post

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 August 30, 2007, 01:25 Rotating domain motion in cfx post #1 pankaj Guest   Posts: n/a I have done a steady state solution for a rotating centrifugal impeller with good converged results. Now I wants to set a transient run for the same impeller. Total time is 20 sec with timesteps of 0.1 sec and initial time is 0 sec. So if i wana to see impeller rotating in cfx-post how should i set the problem? I will go for a transient rotor stator interface in place of frozen rotor. with 20 vanes in impeller and 10 vanes in diffuser how should i set the pitch angle?and for vaneless statinary inlet transient rotor stator interface what will be that pitch angle? whether automatic pitch angle will do? Along with this is there any extra requirement? Also how should i view animation for a rotating impeller in Post? waiting for some help. Thanks and Regards, Pankaj.

 August 31, 2007, 07:08 Re: Rotating domain motion in cfx post #2 Pankaj Guest   Posts: n/a Is there anybody who have done this type of problem?

 September 3, 2007, 21:12 Re: Rotating domain motion in cfx post #3 Kirby Guest   Posts: n/a If you want to see the impeller rotating in Post, you should set a transient model with sliding mesh.

 September 3, 2007, 21:59 Re: Rotating domain motion in cfx post #4 fadly Guest   Posts: n/a i also interested in this problem..and i wanna see the rotating fan in tunnel in my case.So, how can I do the sliding mesh..is it like a moving mesh??

 September 4, 2007, 20:48 Re: Rotating domain motion in cfx post #5 Kirby Guest   Posts: n/a Yes, it's the moving mesh method. In the modeling of the rotating fan, you may use MRF method or Moving mesh method. But the MRF method can only calculate the fluid at a fixed fan's location. If you want to see fluid movement with different location of fans, you should use the moving mesh method. And this method you should cost more time than MRF method.

 September 5, 2007, 12:27 Re: Rotating domain motion in cfx post #6 CycLone Guest   Posts: n/a Hi Kirby, This is true of FLUENT, but not CFX. With CFX you don't need to solve a moving mesh case. You can (and should) still set this up with a rotating frame of reference, but set the domain interface type to Transient Rotor Stator. CFX will solve the rotating part in a rotating frame of reference, but a "virtual" rotation will be added to the interface to clock it's position accordingly. The same setup can be used with this simple change. -CycLone

 September 5, 2007, 14:28 Re: Rotating domain motion in cfx post #7 CycLone Guest   Posts: n/a ...Oh yeah, and CFX-Post will automatically rotate the domain (unless you turn this feature off in the options panel) in the viewer for post-processing purposes.

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