CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

inlet and outlet BCs for airfoil simulation

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 9, 2013, 06:09
Default inlet and outlet BCs for airfoil simulation
  #1
New Member
 
LI Bo
Join Date: Apr 2013
Posts: 13
Rep Power: 12
michel1988 is on a distinguished road
Hello,
I want to do a simulation of airfoil. At inlet, the velocity is fixed and there is no restriction on the pressure (which means the pressure is calculated). At outlet, the pressure is fixed and there is no restriction on the velocity. In OpenFOAM, we must define boundry conditions for each physical quantity at each boundry. My question is : what boundry conditions should be given to pressure at inlet and to velocity at outlet? It is the first time for me to do such a simulation and I am also not familiar with BCs in OpenFOAM. Thanks for your help!
michel1988 is offline   Reply With Quote

Old   July 9, 2013, 08:35
Default
  #2
Member
 
Join Date: Sep 2012
Posts: 60
Rep Power: 13
achyutan is on a distinguished road
Hi,

'zeroGradient' b.c is best suited,among the compiled library of openfoam, for ur case. it takes value of next interior cell (which is calculated based on ur system of eqns).

if you are not satisfied with that, you can create your own new b.c and compile it and link its executable from controlDict.

achyutan
achyutan is offline   Reply With Quote

Old   July 9, 2013, 12:12
Default
  #3
Senior Member
 
Artur's Avatar
 
Artur
Join Date: May 2013
Location: Southampton, UK
Posts: 372
Rep Power: 19
Artur will become famous soon enough
I tend to use zeroGradient as well, sometimes I go for inletOutlet or outletInlet. For the pressure you may also consider fixedValue uniform 0 at the outlet if your domain is long enough.
Artur is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
outlet profiles of LES simulation as transient inlet b.c. for LES of a bend pipe Henny FLUENT 0 March 28, 2013 05:02
define BCs at inlet and outlet for natural ventilation simulation jjz2013 Main CFD Forum 0 January 29, 2013 16:50
p & U outlet bcs for realistic wind inlet profile stevek OpenFOAM 4 July 19, 2010 03:29
VOF Outlet boundary condition in cfd - ace JM Main CFD Forum 0 December 15, 2006 09:07
what the result is negatif pressure at inlet chong chee nan FLUENT 0 December 29, 2001 06:13


All times are GMT -4. The time now is 02:41.