Rotating cylinders

rathish · June 2, 2010, 06:37

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, 09:34

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, 07:07

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, 20:04

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, 07:01

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, 07:02

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, 07:31

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, 05:44

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, 18:22

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

June 2, 2010, 06:37	Rotating cylinders	#1
rathish New Member RATHISH Join Date: Feb 2010 Posts: 13 Rep Power: 16	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...

June 17, 2010, 07:01	Rotating body	#5
rathish New Member RATHISH Join Date: Feb 2010 Posts: 13 Rep Power: 16	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.....

June 17, 2010, 07:02	Rotating body	#6
rathish New Member RATHISH Join Date: Feb 2010 Posts: 13 Rep Power: 16	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.....

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June 2, 2010, 09:34		#2
Susan YU New Member Join Date: Mar 2009 Posts: 7 Rep Power: 17	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?

June 9, 2010, 07:07		#3
rathish New Member RATHISH Join Date: Feb 2010 Posts: 13 Rep Power: 16	Thanks susan.... But it works only for bigger gap..while for smaller gaps, the solution doesnt converges.....pls somebody helps.......

June 9, 2010, 20:04		#4
Susan YU New Member Join Date: Mar 2009 Posts: 7 Rep Power: 17	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

June 20, 2010, 07:31		#7
jack1980 Senior Member Jouke de Baar Join Date: Oct 2009 Posts: 127 Rep Power: 17	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

June 22, 2010, 05:44	2d	#8
rathish New Member RATHISH Join Date: Feb 2010 Posts: 13 Rep Power: 16	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?

June 22, 2010, 18:22		#9
jack1980 Senior Member Jouke de Baar Join Date: Oct 2009 Posts: 127 Rep Power: 17	Yeah this should work. As long as you set the proper center of rotation for both cylinders seperately.