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

Pressue in CFD post is Relative or Absolute pressure?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 5, 2015, 01:11
Lightbulb Pressue in CFD post is Relative or Absolute pressure?
  #1
Senior Member
 
sluzzer
Join Date: Jul 2014
Posts: 118
Rep Power: 4
shivasluzz is on a distinguished road
The pressure and total pressure values in cfd-post are relative pressure or absolute pressure?
I have gone through many post still it is confusing. Please clarify
shivasluzz is offline   Reply With Quote

Old   June 5, 2015, 04:41
Default
  #2
Senior Member
 
Thomas MADELEINE
Join Date: Oct 2014
Posts: 126
Rep Power: 4
Thomas MADELEINE is on a distinguished road
Static Pressure is relative pressure
Absolute Pressure is well... absolute pressure
and Total Pressure is Total Pressure (static + dynamic). It is absolute like the Pressure.

For more details see the help in ANSYS CFX theory guide 1.1.3 then Pressure or Total Pressure

Last edited by Thomas MADELEINE; June 5, 2015 at 04:46. Reason: wrong emplacment of help paragraph
Thomas MADELEINE is offline   Reply With Quote

Old   June 5, 2015, 07:24
Default
  #3
Senior Member
 
sluzzer
Join Date: Jul 2014
Posts: 118
Rep Power: 4
shivasluzz is on a distinguished road
thanks Thomas for your reply...
so, if i used some reference pressure other than 0, then my total pressure is total pressure (from cfd post) + reference pressure used.. am i right?
shivasluzz is offline   Reply With Quote

Old   June 5, 2015, 08:19
Default
  #4
Senior Member
 
Thomas MADELEINE
Join Date: Oct 2014
Posts: 126
Rep Power: 4
Thomas MADELEINE is on a distinguished road
No.
quote from ANSYS Help:
The terms Pressure and Total Pressure are absolute quantities and must be used to derive the Total Pressure when using an equation of state (compressible) formulation (particularly for Equation 1–48).
Thomas MADELEINE is offline   Reply With Quote

Reply

Tags
cfd post, pressure, relative 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
specific heat capacity at constant pressure in CFD Post newbie384 CFX 5 November 27, 2015 22:25
static enthalpy calculation in CFD Post newbie384 CFX 2 March 22, 2014 08:28
CFD Post Streamlines better representation? Dr. Flow Squad CFX 2 January 20, 2014 14:48
Difference between pressure, absolute pressure and Total Pressure shaswat CFX 1 September 6, 2012 06:12
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 10:36.