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-   -   How to set rotating wall as boundary condition (http://www.cfd-online.com/Forums/fluent/64800-how-set-rotating-wall-boundary-condition.html)

babu May 25, 2009 05:22

How to set rotating wall as boundary condition
 
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

jeniuswx May 25, 2009 06:31

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!

babu May 25, 2009 10:51

Quote:

Originally Posted by jeniuswx (Post 217081)
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?

jeniuswx May 25, 2009 21:01

you should define a fluid zone which contains the edge you said,and then define this zone as a ratation field!

babu May 26, 2009 03:45

Quote:

Originally Posted by jeniuswx (Post 217143)
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?

anupamjain76 May 29, 2009 05:08

Consider entire fluid zone as rotating.

soroush August 3, 2011 12:02

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!

subhas.hunasikatti@gmail. December 14, 2013 05:48

Quote:

Originally Posted by babu (Post 217109)
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....

thank you
with regards
subhas


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