CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Fluent UDF and Scheme Programming

How to get the total pressure in the UDF?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 12, 2012, 05:50
Default How to get the total pressure in the UDF?
  #1
New Member
 
Zhi-Gang Zhai
Join Date: Sep 2012
Location: karlsruhe, Germany
Posts: 7
Rep Power: 4
zgzhai is on a distinguished road
Hello all:
My case is incompressible single phase flow, and I want to get the total pressure and static pressure of some nodes. But the C_P could only get the static pressure, but how to get the total pressure in the UDF? Thank you very much.

BTW: i search a very old thread that said the fluent interior data structure. The total pressure is the 'derived' term, not the 'variable'. So it can not be got , should be calculated by 'total pressure = static pressure + operation pressure + 0.5*rho*v*v '. but I find the true case is not like this. I use the PLOT to print out the total pressure, dynamic pressure and static pressure. The total pressure from the PLOT is bigger than the calculated total pressure with the above formula. I guess maybe there is a coefficient before the '0.5*rho*v*v' .
zgzhai is offline   Reply With Quote

Old   September 12, 2012, 06:02
Default
  #2
Senior Member
 
ghost82's Avatar
 
Daniele
Join Date: Oct 2010
Location: Italy
Posts: 902
Rep Power: 15
ghost82 will become famous soon enough
Hi,
have you read this thread?
static vs. total pressure
ghost82 is offline   Reply With Quote

Old   September 12, 2012, 06:15
Default
  #3
New Member
 
Zhi-Gang Zhai
Join Date: Sep 2012
Location: karlsruhe, Germany
Posts: 7
Rep Power: 4
zgzhai is on a distinguished road
thanks to ghost82. I have read this thread. But I think the conclusion is not clear. if total pressure = static pressure + operation pressure + dynamic pressure, my question still exists . Thank you again.
zgzhai is offline   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
Dynamic pressure from the total pressure specified saisanthoshm88 CFX 1 August 9, 2012 06:13
Total Pressure BC or Porous Media? khoopes FLUENT 0 August 2, 2012 12:24
Total Pressure problem in a duct anveshkadimi FLUENT 0 July 20, 2012 13:19
Total pressure in CFX famarcfd CFX 0 June 17, 2011 10:33
total pressure in CFX Atit Koonsrisuk CFX 0 January 1, 2005 06:46


All times are GMT -4. The time now is 22:26.