CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLUENT (http://www.cfd-online.com/Forums/fluent/)
-   -   Rotating cylinders (http://www.cfd-online.com/Forums/fluent/76715-rotating-cylinders.html)

rathish June 2, 2010 05:37

Rotating cylinders
 
Could anybody tell me how a rotating cylinder can be modeled in fluent....I have tried moving mesh method and rotating reference method. But the rotating effect has not been seen so far. Some body Pls help me...

Susan YU June 2, 2010 08:34

Rotating reference frame will work, try again.

Have you define the correct rotating axis? have you define the rotating fluid? is there any reference can tell you it is rotate or not in your case?

rathish June 9, 2010 06:07

Thanks susan....
But it works only for bigger gap..while for smaller gaps, the solution doesnt converges.....pls somebody helps.......

Susan YU June 9, 2010 19:04

for the converge problem, try to start the rotating speed from a smaller one, say from one tenth of the real rotating speed, and then increase step by step, maybe it help

rathish June 17, 2010 06:01

Rotating body
 
Ok, thanks....
I need to check whether i have made any mistakes so far, in the case of rotating cylinder. So i want a gambit mesh file of any rotating body and its boundary conditions so as to run it in fluent and to compare the results....Anybody could please tell me where can i find the ".msh "file of any rotating body....Somebody please help me.....

rathish June 17, 2010 06:02

Rotating body
 
:)
Ok, thanks....
I need to check whether i have made any mistakes so far, in the case of rotating cylinder. So i want a gambit mesh file of any rotating body and its boundary conditions so as to run it in fluent and to compare the results....Anybody could please tell me where can i find the ".msh "file of any rotating body....Somebody please help me.....

jack1980 June 20, 2010 06:31

like the rotating sphere in another thread:

If it are simple smooth cylinders you might consider to have a stationary grid and put the rotation in the (moving wall) boundary condition. This could simplify your problem dramatically

rathish June 22, 2010 04:44

2d
 
Is it possible to give rotational velocity in fluent 2ddp?
My problem is a rotating cylinder....I have seen the boundary condition options ( stationary/ moving) in fluent 2ddp. But is it effective?

jack1980 June 22, 2010 17:22

Yeah this should work. As long as you set the proper center of rotation for both cylinders seperately.


All times are GMT -4. The time now is 23:20.