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

PRefCell not constant

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 6, 2017, 12:42
Default PRefCell not constant
  #1
C-L
Member
 
Charlie Lloyd
Join Date: Feb 2016
Posts: 47
Rep Power: 3
C-L is on a distinguished road
Hi all,

I am simulating a fully developed channel flow using RANS and cyclic boundary conditions. In order to do so I need to specify a reference pressure at a certain location. I have chosen a cell on one of the wall boundaries to have a reference pressure of 0 BUT after checking the converged solution the pressure at this cell is 0.029. I assumed the reference cell would maintain the reference pressure throughout the whole simulation - is this not the case?

Thanks in advance.
C-L is offline   Reply With Quote

Old   June 11, 2017, 14:47
Default
  #2
Senior Member
 
khedar
Join Date: Oct 2016
Posts: 110
Rep Power: 3
khedar is on a distinguished road
Just wondering, is it okay to put reference cell on the wall? Since normally we apply zeroGradient condition on the wall.
khedar is offline   Reply With Quote

Old   June 11, 2017, 14:58
Default
  #3
C-L
Member
 
Charlie Lloyd
Join Date: Feb 2016
Posts: 47
Rep Power: 3
C-L is on a distinguished road
I assumed that it wouldn't matter but you might be right. However, I'm not sure where else to put the reference point in a periodic channel. I need to be able to calculate forces on the wall so wouldn't they be dependent on the pressure field? And wouldn't changing the reference point subsequently change the force calculations?

Thanks for the reply.
C-L 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
decomposePar problem: Cell 0contains face labels out of range vaina74 OpenFOAM Pre-Processing 30 August 23, 2017 13:25
fluid flow but temperature raises from nowhere? mxcfd STAR-CCM+ 5 September 16, 2014 05:46
How to install CGNS under windows xp? lzgwhy Main CFD Forum 1 January 11, 2011 19:44
CGNS lib and Fortran compiler manaliac Main CFD Forum 2 November 29, 2010 07:25
Really big problems when creating own materials da Jop FLUENT 0 June 28, 2007 11:15


All times are GMT -4. The time now is 16:23.