# How to set rotating wall as boundary condition

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 May 25, 2009, 05:22 How to set rotating wall as boundary condition #1 New Member   Babu Join Date: May 2009 Posts: 5 Rep Power: 17 Hi, I am quite new in CFD simulation. I am doing a simulation something like that, there is a rectangular surface. In the surface there is a restriction like a orifice plate(actually another rectangular plate) in the middle position attached to the upper edge. The upper wall is statinary and the lower wall is rotating.the lower wall is actually a shaft. How should I define this roatation as a boundary condition in the lower wall which is rotating. Its a 2d problem. I have defined the problem as a axisymmetric model

 May 25, 2009, 06:31 #2 New Member   tjut-wx Join Date: May 2009 Posts: 14 Rep Power: 17 In my opinion, you can try to use the MRF method,in the fluent help,youcan find the example refered to the MRF! Good luck!

May 25, 2009, 10:51
#3
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Babu
Join Date: May 2009
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Quote:
 Originally Posted by jeniuswx In my opinion, you can try to use the MRF method,in the fluent help,youcan find the example refered to the MRF! Good luck!
I have checked the example. But for my case it is only one reference rotating frame problem. I have also checked the single reference frame example.Could you tell me is it ok if i do like this " I take the rotaing edge(the line as it is 2d) as a wall and define it as a rotational wall and give the value of shaft rotation to that wall. Because there is a option in fluent to do the wall as a rotating wall. But in the example they have given the rotation speed to the fluid zone. Should I give rotation to the fluid zone or only in the inner edge?

 May 25, 2009, 21:01 #4 New Member   tjut-wx Join Date: May 2009 Posts: 14 Rep Power: 17 you should define a fluid zone which contains the edge you said,and then define this zone as a ratation field!

May 26, 2009, 03:45
#5
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Babu
Join Date: May 2009
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Quote:
 Originally Posted by jeniuswx you should define a fluid zone which contains the edge you said,and then define this zone as a ratation field!
Should I make different zone for the near rotaing wall section or should I take all the fluid as rotating?

 May 29, 2009, 05:08 #6 New Member   Anupam Jain Join Date: May 2009 Posts: 5 Rep Power: 17 Consider entire fluid zone as rotating.

 August 3, 2011, 12:02 #7 New Member   soroush.armd@yahoo.com Join Date: Jul 2011 Posts: 5 Rep Power: 14 hi I want to model a liquid film on a rotating disk,I use axisymmetric swirl,is it correct? I heard something about moving refrence frame!does it work for my modeling? tnx!

December 14, 2013, 04:48
#8
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subhas hunasikatti
Join Date: Sep 2013
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Quote:
 Originally Posted by babu I have checked the example. But for my case it is only one reference rotating frame problem. I have also checked the single reference frame example.Could you tell me is it ok if i do like this " I take the rotaing edge(the line as it is 2d) as a wall and define it as a rotational wall and give the value of shaft rotation to that wall. Because there is a option in fluent to do the wall as a rotating wall. But in the example they have given the rotation speed to the fluid zone. Should I give rotation to the fluid zone or only in the inner edge?

Hi friend i am ding cpu cooling system problem, in this i have to given the SNPS FAN rpm , please tell me how can i give the fan rpm in fluent....

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subhas