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

Flow measurement around intake valve pressure condition problem

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 18, 2006, 08:41
Default hello i'm federico, and i'm ne
  #1
fedegavo
Guest
 
Posts: n/a
hello i'm federico, and i'm new here.
i'm simulating the flow around an intake valve of a four stroke engine, but i've some problems with the pressure; the whole cylinder is 400 mm long and the intake valve is 28 mm wide.
1) inlet condition: given velocity, zero grad p, outlet: given p, zero grad velocity; i made 0.1 s simulation but pressure waves are fluctuating a lot. shall i still make it run for 0.2-0.3 s?
2) inlet condition: given velocity, zero grad p, outlet: pressure transmissive with pinf 89000, value 95150 (ambient p), linf 1000, then 10000, then 100000; in both 3 cases i reached fast convergence, but the pressure went to 97000 kpa! shall i lower pinf to 65000 kpa or so on and change linf?
which of the 2 cases do you think suits better for my simulation
thanks
federico
  Reply With Quote

Old   January 20, 2006, 13:06
Default it's always me.. for this sim
  #2
fedegavo
Guest
 
Posts: n/a
it's always me..
for this simulation i'm working with sonicTurbFoam, in a static case, with a 67000 cells of 2 mm exaedrical..
  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 drop measurement Ananta Phoenics 2 April 30, 2008 05:18
Pressure drop of valve with valve opening of 30% elogesh Main CFD Forum 2 January 5, 2007 12:30
Estimation of the flow coefficient of an intake valve lucchini OpenFOAM Running, Solving & CFD 3 February 7, 2006 10:11
Flow field measurement in turbomachinery! Wanlai Lin Main CFD Forum 3 September 3, 1999 12:06
Intake valve calculation khalel Main CFD Forum 1 May 3, 1999 10:47


All times are GMT -4. The time now is 20:44.