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

Negative Total Pressure in cavitatingFoam RAS/Throttle Case in OF 1.6

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 30, 2010, 15:59
Default Negative Total Pressure in cavitatingFoam RAS/Throttle Case in OF 1.6
  #1
New Member
 
Michael Ahlmann
Join Date: Feb 2010
Posts: 27
Rep Power: 7
danishdude is on a distinguished road
I'm working on modelling cavitating flow in a series of control valves, and my plan was to use cavitatingFoam to do so. However, when running the "Throttle" tutorial case in the "RAS" subfolder, I noticed that the total pressures (calculated using ptot utility) go negative which seems unphysical. I know that in some other CFD solvers there is a reference pressure somewhere, does OpenFOAM use anything similar? If not, can somebody explain why the negative pressure shows up?
danishdude is offline   Reply With Quote

Old   September 6, 2010, 05:36
Default same problem...
  #2
New Member
 
Join Date: Sep 2010
Posts: 1
Rep Power: 0
nico9238 is on a distinguished road
I need to simulate the cavitation in an injector. To get more familiar with the code dedicated to the cavitation in openFoam, I try to run the throttle tutorials case.
I also got some negative value for the pressure. Moreover I can observe some backflow from the outlet and a kind of pressure wave... I donīt know how to solve the problem. If you have any idea, would be great!
thx
nico9238 is offline   Reply With Quote

Reply

Tags
cavitatingfoam, multiphase, negative pressure, negative total pressure

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
negative static pressure Selo melo FLUENT 5 December 18, 2006 10:30
negative pressure mAx FLUENT 0 January 25, 2006 15:31
Total pressure to static pressure ratio roadracer CD-adapco 1 April 17, 2003 05:31
total pressure change in a pipe flow Im FLUENT 4 February 6, 2002 20:09
Hydrostatic pressure in 2-phase flow modeling (long) DS & HB Main CFD Forum 0 January 8, 2000 16:00


All times are GMT -4. The time now is 21:26.