CFD Online Logo CFD Online URL
Home > Forums > Siemens

Second invariant of velocity Gradient

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

LinkBack Thread Tools Display Modes
Old   September 13, 2004, 08:43
Default Second invariant of velocity Gradient
Posts: n/a
Hi, I want to ask if somebody could help me how to calculate second invariant of velocity Gradient Qij=-1/2 dui/dxj*duj/dxi with .MAC files by using Registers...

Also I will be very glad if one could send me the necessary environmental variables for linux and where to locate them. I do not have the installation guide and it does not exist in the CD of STAR-CD...

  Reply With Quote

Old   September 28, 2004, 02:31
Default Re: Second invariant of velocity Gradient
Posts: n/a
Linux variables (may differ slightly for your case)

export STARVER=v3150 export STARDIR=/path star directory/ export STARUSR=/same as STARDIR/ export LM_LICENSE_FILE=$STARDIR/license/license.dat

If you are using ABSOFT then dont forget to set the environment for that aswell.

Dont know much about data manipulation other than that in user subroutines. But, my guess would be that you can calculate the second invariant in a subroutin and store it in a data file and then read it in the .MAC

Goodluck, Sheila
  Reply With Quote

Old   September 28, 2004, 06:18
Default Re: Second invariant of velocity Gradient
Posts: n/a
Thank you Sheila for your response I have done the second invariant approximately as you say by writing in a file using Register operations...

  Reply With Quote


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
Velocity u.Gradient X Mgtripple CFX 11 January 28, 2014 11:01
velocity gradient Merinadica FLUENT 0 December 16, 2006 05:53
zero velocity gradient fevzi Phoenics 4 February 16, 2006 06:01
Velocity gradient Stephen FLUENT 0 April 7, 2003 10:29
Velocity gradient Stephen Main CFD Forum 0 April 7, 2003 10:28

All times are GMT -4. The time now is 06:55.