CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Periodic boundary condition

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   May 1, 2003, 04:02
Default Periodic boundary condition
  #1
Arif
Guest
 
Posts: n/a
I am simulating a flow problem using periodic boundary condition. Two end of a circular tube consider as translational periodic boundary. According to the fluent documentation, we can specify mass flow rate or pressure gradient for periodic boundary condition. In my case I specified mass flow rate. Now I want to calculate pressure loss to compare with standard friction factor correlation. In the article 8.3.2 of user's guide showed that

Local pressure gradient =gradient of periodic component of pressure + gradient of linearly-varying component of pressure

We can get gradient of a linearly-varying component from periodic condition panel. How can we find the gradient of periodic component of pressure? Any help in this regards is greatly appreciated.

Arif
  Reply With Quote

Old   December 22, 2013, 00:14
Smile Hi Arif
  #2
New Member
 
ASHRAF ALFANDI
Join Date: Oct 2012
Posts: 17
Rep Power: 4
ashraf88 is on a distinguished road
In this case, the "linearly-varying component = beta" is the actual pressure drop across the your domain in which FLUENT calculates the beta that corresponds to the input mass flow rate. Once the calculation is done, go back to the periodic B.C panel and check "beta" and thats you dp.

good luck.....
ashraf88 is offline   Reply With Quote

Old   January 17, 2014, 07:48
Default
  #3
Member
 
Join Date: Dec 2013
Posts: 53
Rep Power: 3
myaccount is on a distinguished road
Hi everyone!!!

I am trying to simulate a 1d heat transfer in a medium confined between two large walls (top and bottom wall). I created a 2d rectangle in icem cfd. For top and bottom lines I have given the boundary conditions as walls. But I am not clear what boundary condition I should use for left and right lines which are not supposed to be present. (I created them only for meshing)..

do I have to use periodic condition?

Pls reply.
myaccount is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
mixed inflow/outflow downstream boundary condition question peob OpenFOAM Running, Solving & CFD 2 August 14, 2014 09:07
periodic boundary condition (translational) fluent 6.3 haihek FLUENT 3 January 22, 2014 05:10
periodic boundary condition in LES martor FLUENT 2 April 10, 2012 19:17
External Radiation Boundary Condition for Grid Interface CFD XUE FLUENT 0 July 9, 2010 02:53
translational periodic boundary condition Rola Afify FLUENT 2 September 12, 2006 08:39


All times are GMT -4. The time now is 07:27.