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

Set inlet velocity and pressure in cavitational model

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 27, 2012, 09:45
Default Set inlet velocity and pressure in cavitational model
  #1
New Member
 
Gerardo
Join Date: Apr 2012
Location: Trento Italy
Posts: 5
Rep Power: 5
GerardX89 is on a distinguished road
Hello people,

I want to set the BCs in my venturi tunnel set with a cavitational model.
my intial condition are:
V= 18 m/s
P0 = 39700 Pa

When I set the cavitational model I have to put at 0 the operating pressure so I cannot modify it.

I tried to use the pressure inlet.
I assumed that the:
gauge total pressure = total pressure
the supersonic/initial gauge pressure = static pressure

so using this formula: p_0 = p_s + 1/2 ro*v^2
p_0= total pressure
p_s= static pressure
v=velocity
ro=density

I should find my static pressure and put those values in the inlet right?
But unfortunally in postprocessing I don't have in the inlet the velocity that I want or better that I thought I imposed.

Please help me

Best
Gerardo
GerardX89 is offline   Reply With Quote

Old   July 5, 2012, 16:17
Default
  #2
New Member
 
Gerardo
Join Date: Apr 2012
Location: Trento Italy
Posts: 5
Rep Power: 5
GerardX89 is on a distinguished road
Sorry for the delay and thanks for your help.
here is the case and data file:
https://dl.dropbox.com/u/8252311/Sez_gola_Press.zip


Ps: I just noticed that even if I change the supersonic/initial gauge pressure
the result doesn't change it's like fluent is not considering it.
GerardX89 is offline   Reply With Quote

Reply

Tags
cavitation, initial conditions

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 Inlet VS velocity Inlet difference Mohsin FLUENT 6 January 15, 2015 18:15
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
Neumann pressure BC and velocity field Antech Main CFD Forum 0 April 25, 2006 02:15
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11
what the result is negatif pressure at inlet chong chee nan FLUENT 0 December 29, 2001 06:13


All times are GMT -4. The time now is 20:39.