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

Neumann pressure boundary condition

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 9, 2006, 14:05
Default Neumann pressure boundary condition
  #1
ricklee
Guest
 
Posts: n/a
Dear all:

I have some problem in boundary condition.

The Neumann BC for pressure is

partial P / partial n = 0;

In BC, if the flow direction is X-axis, I set

P(x,0)=P(x,1); Am I right?
  Reply With Quote

Old   May 9, 2006, 14:30
Default Re: Neumann pressure boundary condition
  #2
ganesh
Guest
 
Posts: n/a
Dear Ricklee,

If you are having flow in x-direction in a 2D domain, then for the inlet/outlet (say) which are aligned along y-axis, the normal is in x. Thus , dp/dn reduces to dp/dx and hnce po=p1 as you have got. Excuse fot the total derivative symbols. The BC is primarily a simple extrapolation BC when applied to the outlet to first order accuracy. May be more information about the problem you are solving and the specific trouble you are facing could make things clearer.

Hope this helps

Regards,

Ganesh

  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
Doubt in Inlet Pressure Boundary Condition Sumitha FLUENT 3 October 20, 2008 03:19
Question about pressure inlet boundary condition. Alina FLUENT 1 November 30, 2007 08:39
pressure boundary condition in fractional step Jean-Fran├žois Corbett Main CFD Forum 3 January 10, 2006 09:49
Pressure Boundary Condition chiseung FLUENT 1 June 19, 2001 21:05
Pressure boundary condition C-H Kuo Main CFD Forum 9 August 28, 1998 12:07


All times are GMT -4. The time now is 13:43.