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

How to mention neuman boundary condition for velocity at the outlet or inlet??

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 1, 2009, 14:30
Default How to mention neuman boundary condition for velocity at the outlet or inlet??
  #1
New Member
 
souviktor
Join Date: Mar 2009
Posts: 11
Rep Power: 17
Souviktor is on a distinguished road
Hi all


I am modeling 2d axi-symmetric laminar pipe flow with ferrohydrodymaic source terms.

Now,the problem is very simple.I want to specify du/dx=0 at the boundaries(inlet ,outlet where ever I want,if its a part of extremely long piping network the flow can be fully developed at both ends.) instead of specifying u=1 m/s ,0.2 mm/sec 3 m/sec.... blah,blah etc.

I know there are define_profile macros which can set velocity profile(nothings but sets the value of velocity at the boundary for non uniform radial variation)

But how can I set the velocity gradient =0 at the boundary(i.e the cell_face at the extreme ends)????

Any help is greatly appreciated.
Souviktor is offline   Reply With Quote

Reply

Tags
boundary condition, fully developed., gradient, neuman, udf

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
Inlet boundary condition jkwan FLUENT 1 August 5, 2008 22:22
outlet to inlet boundary condition assighna CFX 1 May 11, 2007 00:36
Pressure Inlet Boundary Condition Trinity_psu FLUENT 0 June 1, 2005 15:15
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 16:55
inlet and outlet boundary condition of pump Thammasak CFX 0 February 9, 2004 14:02


All times are GMT -4. The time now is 09:05.