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

Negative pressure

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 23, 2007, 01:35
Default Negative pressure
  #1
mahut
Guest
 
Posts: n/a
This might seem silly to some guys. I am doing a fuel cell project. I have two flow channels. The problem I am facing is that I get negative absolute pressures on one of the flows(I do see velocities on both the sides). I don't know what the problem is. Please give me an idea as to what I am doing wrong.
  Reply With Quote

Old   September 27, 2007, 05:00
Default Re: Negative pressure
  #2
carno
Guest
 
Posts: n/a
Check the physics of the model. Check if there is any phase change. If you do not model this you may get the negative pressure. e.g. cavitation in case of liquid fluids. If the fluid is gaseous, switch on compressibility.

Secondly wait to get the full convergence. It may vanish after some time.

Hope this helps
  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
Pressure BC for combustion chamber Giuki FLUENT 1 July 19, 2011 11:35
seeking for help about a room with negative pressure mengyue1 FLUENT 0 November 26, 2009 07:40
High pressure in rhopSonicFoam results in negative pressure shangzung OpenFOAM 0 November 5, 2009 04:24
negative pressure in cfx flar.t CFX 1 December 19, 2006 00:20
negative pressure mAx FLUENT 0 January 25, 2006 15:31


All times are GMT -4. The time now is 02:09.