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

Zero-Grad Pressure

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 14, 2005, 04:30
Default Zero-Grad Pressure
  #1
Shazlan
Guest
 
Posts: n/a
Hi all,

I just have a single simple question, which I couldnt find the answer in the user guide. in the pressure BC option, what does it mean by 'zero-grad' for the turbulence switch? when are we supposed to use it as oppose to k/Epsilon? Thanks

shazlan
  Reply With Quote

Old   March 14, 2005, 11:16
Default Re: Zero-Grad Pressure
  #2
Somnath
Guest
 
Posts: n/a
when u dont know the turbulence intensity or k/e value at any boundary (prefarably outflow) at that position u can give zero-grad so that those value is calculated from er interior solution domain or computational domain.
  Reply With Quote

Old   March 15, 2005, 04:06
Default Re: Zero-Grad Pressure
  #3
Shazlan
Guest
 
Posts: n/a
So, if star can calculate those values for us, whats the point of inputting the parameters to begin with?

anyway, thanks somnath for your reply
  Reply With Quote

Old   March 15, 2005, 04:48
Default Re: Zero-Grad Pressure
  #4
Anton Lyaskin
Guest
 
Posts: n/a
Usually you use zero-grad option it you have "outlet" pressure boundary and specified turbulence parameters if you use "inlet" pressure boundary
  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
Grad evaluation cfdmarkus OpenFOAM Bugs 2 July 16, 2009 19:54
Generalized Neumann BC q f nc grad f%3dg maddhi OpenFOAM Running, Solving & CFD 4 July 7, 2009 12:27
Admission to grad school Mohit Main CFD Forum 0 October 13, 2008 03:28
Best Grad School ramboy Main CFD Forum 4 October 6, 2008 15:35
Grad and lift coefficient jano FLUENT 1 June 15, 2000 19:54


All times are GMT -4. The time now is 04:42.