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

Absolute pressure

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 24, 2021, 07:14
Default Absolute pressure
  #1
New Member
 
Karla Jacinto
Join Date: Oct 2020
Posts: 4
Rep Power: 3
karlag is on a distinguished road
Hi,

I'm using FLUENT 2020 R2 to simulate a flow.

For the inlet boundary condition, I'm using Pressure Inlet with 9 300 000 Pa for the Gauge Total Pressure, and for the outlet, I'm using Pressure Outlet with Gauge Pressure of 4 600 000 Pa.

I notice that the outlet pressure is the Absolute pressure (my reference value is 0). However, for the inlet the 9,3 MPa corresponds to the total (stagnation pressure = dynamic + absolute), but I want to ignore the dynamic. Is possible to set the absolute pressure at the inlet instead of the total?

Thanks for your help
karlag is offline   Reply With Quote

Old   September 24, 2021, 14:19
Default
  #2
Senior Member
 
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 4,931
Rep Power: 58
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
Physically it is unrealistic (darn near impossible) to fix a static pressure at a flowing inlet unless the inlet is choked (i.e. Mach number equal to or greater than 1).

What you should do, is adjust your BC setting of total pressure such that you get the desired static pressure. Use the isentropic relations. You will of course need to know your inlet Mach number. Or you can just keep guessing until you get the right static pressure.
LuckyTran is offline   Reply With Quote

Reply

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
Regarding determinng the absolute hydrostatic pressure for air+water flow in a closed er_ijaz OpenFOAM 0 September 18, 2018 00:11
question regarding LES of pipe flow - pimpleFoam Dan1788 OpenFOAM Running, Solving & CFD 37 December 26, 2017 14:42
forcesCoeffs - how to use relative pressure instead of absolute pressure WhiteW OpenFOAM Running, Solving & CFD 2 December 22, 2015 12:40
Neumann pressure BC and velocity field Antech Main CFD Forum 0 April 25, 2006 02:15
about large minus absolute pressure richard FLUENT 3 December 6, 2003 09:39


All times are GMT -4. The time now is 21:45.