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

Question about RANS

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 11, 2012, 06:25
Question Question about RANS
  #1
Senior Member
 
Anna Tian's Avatar
 
Meimei Wang
Join Date: Jul 2012
Posts: 494
Rep Power: 15
Anna Tian is on a distinguished road
Hi,

Turbo machinery is turning when we operate it. So it should be transient fluid behavior. But why we often still use RANS to solve it?
__________________
Best regards,
Meimei
Anna Tian is offline   Reply With Quote

Old   September 11, 2012, 08:07
Default
  #2
Senior Member
 
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,760
Rep Power: 71
FMDenaro has a spectacular aura aboutFMDenaro has a spectacular aura aboutFMDenaro has a spectacular aura about
Quote:
Originally Posted by Anna Tian View Post
Hi,

Turbo machinery is turning when we operate it. So it should be transient fluid behavior. But why we often still use RANS to solve it?
using RANS is correct for flows that are statistically steady (no matter of the transient phase), otherwise you can use URANS, as done in the engine cycle where you have a forcing that is periodi in time
FMDenaro is offline   Reply With Quote

Old   September 11, 2012, 09:42
Default
  #3
Senior Member
 
Gonzalo
Join Date: Mar 2011
Location: Argentina
Posts: 122
Rep Power: 16
gfoam is on a distinguished road
Quote:
Originally Posted by Anna Tian View Post
Hi,

Turbo machinery is turning when we operate it. So it should be transient fluid behavior. But why we often still use RANS to solve it?
Take a look at http://www.cfd-online.com/Wiki/Best_...omachinery_CFD there is a good explanation about thees topics. Regards
Gonzalo
gfoam 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
question about uds tanven FLUENT 2 July 5, 2015 12:22
internal field question - PitzDaily Case atareen64 OpenFOAM Running, Solving & CFD 2 January 26, 2011 16:26
Question about Table applicaiton. universez OpenFOAM Running, Solving & CFD 0 January 12, 2010 21:31
Modeling instabilities using RANS? thecfduser FLUENT 0 November 16, 2009 18:08
Poisson Solver question Suresh Main CFD Forum 3 August 12, 2005 05:37


All times are GMT -4. The time now is 16:13.