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

convective boundary conditon

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 7, 2008, 04:09
Default convective boundary conditon
  #1
student
Guest
 
Posts: n/a
Sir, I am solving channel flow problem, At the exit I used fully developed boundary condtion du/dx=0.

I have seen one paper mentioned at the exit convective boundary condtion i.e du/dt+u(avg)*du/dx=0 please help me how to use this as boundary condtion. Thank you

  Reply With Quote

Old   November 7, 2008, 12:18
Default Re: convective boundary conditon
  #2
kondan
Guest
 
Posts: n/a
The second equation also implies the fully developed conditions at the exit (du/dt = 0 for steady flow, and second term du/dx = 0 as you have specified). So you are all set. No problem there.
  Reply With Quote

Old   November 10, 2008, 00:22
Default Re: convective boundary conditon
  #3
student
Guest
 
Posts: n/a
Thanks. Actually I am solving time dependent problem I understood. One more doubt in vortex shedding problem at the top wall u[i][j]=-u[i][j-1] and at the bottom wall u[i][j]=-u[i][j+1]. Could you please tell me how do we name this type of boundary conditions.
  Reply With Quote

Old   November 10, 2008, 13:46
Default Re: convective boundary conditon
  #4
kondan
Guest
 
Posts: n/a
I assume it has to deal with periodic boundary conditions.
  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
Wind turbine simulation Saturn CFX 45 February 8, 2016 05:42
Import problem ARC Open Source Meshers: Gmsh, Netgen, CGNS, ... 0 February 27, 2010 11:56
RPM in Wind Turbine Pankaj CFX 9 November 23, 2009 05:05
Boundary conditon about interior zhou FLUENT 0 September 19, 2003 18:00
Boundary conditions? Tom Main CFD Forum 0 November 5, 2002 02:54


All times are GMT -4. The time now is 09:55.