Translational+rotational periodic flow

Shamoon Jamshed · June 1, 2017, 22:04

Hello CFD experts,

I want to model a flow with periodic boundaries. The flow is rotational as well as translational periodic in nature. (Please see attached figure). Therefore I have modelled a 3d helical periodic segment. In Fluent, under Periodic conditions, I gave MFR and Bulk temperature as 298.15. While the outer wall heat flux is 298.15 K. The contours formed for temperature are pretty strange. Since the geometry contains helical shape,the translation distance in the figure is upto 1 pitch length (12.7 mm), which is for helix angle 60 degree. Please help me, why the temperature is not resolving right? Will, the boundary conditions "velocity inlet" and "pressure outlet" (instead of translational periodic) help?

Shamoon Jamshed · June 5, 2017, 09:18

Hello friends,
Please help me out in this problem, I would be grateful to you!

Shamoon Jamshed · June 14, 2017, 20:15

Dear Friends,

Any idea on how to fix this problem?

Shamoon Jamshed · June 18, 2017, 11:58

Dear CFD fellows,

Please help me in this problem, I would be thankful to you, I am also attaching an image showing the above problem

lihongyang0 · June 21, 2017, 23:01

I want to check your case file. You could send me the files. lihongyang0@126.com But I am not sure I could solve your problem.

lihongyang0 · June 24, 2017, 10:24

I have recieved your case. You mean the temperature is low at the rotational periodic face?

Shamoon Jamshed · June 24, 2017, 11:09

NO, I mean when you run the simulations, after convergence, the results of temperature are like the one mentioned in figure which should not be the case, since we are applying flux at top, the temperature field must be uniform at a given cross section.

June 1, 2017, 22:04	Translational+rotational periodic flow	#1
Shamoon Jamshed Senior Member Shamoon Jamshed Join Date: Apr 2009 Location: Karachi Posts: 381 Rep Power: 18	Hello CFD experts, I want to model a flow with periodic boundaries. The flow is rotational as well as translational periodic in nature. (Please see attached figure). Therefore I have modelled a 3d helical periodic segment. In Fluent, under Periodic conditions, I gave MFR and Bulk temperature as 298.15. While the outer wall heat flux is 298.15 K. The contours formed for temperature are pretty strange. Since the geometry contains helical shape,the translation distance in the figure is upto 1 pitch length (12.7 mm), which is for helix angle 60 degree. Please help me, why the temperature is not resolving right? Will, the boundary conditions "velocity inlet" and "pressure outlet" (instead of translational periodic) help? Last edited by Shamoon Jamshed; June 21, 2017 at 19:46.

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June 5, 2017, 09:18		#2
Shamoon Jamshed Senior Member Shamoon Jamshed Join Date: Apr 2009 Location: Karachi Posts: 381 Rep Power: 18	Hello friends, Please help me out in this problem, I would be grateful to you!

June 14, 2017, 20:15		#3
Shamoon Jamshed Senior Member Shamoon Jamshed Join Date: Apr 2009 Location: Karachi Posts: 381 Rep Power: 18	Dear Friends, Any idea on how to fix this problem?

June 21, 2017, 23:01		#5
lihongyang0 New Member 李弘扬 Join Date: Jan 2012 Posts: 12 Rep Power: 14	I want to check your case file. You could send me the files. lihongyang0@126.com But I am not sure I could solve your problem.

June 24, 2017, 10:24		#6
lihongyang0 New Member 李弘扬 Join Date: Jan 2012 Posts: 12 Rep Power: 14	I have recieved your case. You mean the temperature is low at the rotational periodic face?

June 24, 2017, 11:09		#7
Shamoon Jamshed Senior Member Shamoon Jamshed Join Date: Apr 2009 Location: Karachi Posts: 381 Rep Power: 18	NO, I mean when you run the simulations, after convergence, the results of temperature are like the one mentioned in figure which should not be the case, since we are applying flux at top, the temperature field must be uniform at a given cross section.