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

y+ and y* values in Fluent

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 5, 2011, 17:39
Default y+ and y* values in Fluent
  #1
New Member
 
Join Date: Nov 2011
Posts: 8
Rep Power: 5
HLYBoy is on a distinguished road
I've been running a nozzle case with a standard k-epsilon turbulence model and when I plot the y+ against the distance down the nozzle, the velus I get range from about 16-35. In the Fluent Theory Guide, it tells me to use a y* > 15 and I believe that y* and y+ are effectively the same.

But, I've now heard that I need a y+ of greater than 30 otherwise the errors get too large.

Does this mean my y+ values have been way too small?

Thanks in advance!
HLYBoy is offline   Reply With Quote

Old   December 5, 2011, 17:58
Default
  #2
New Member
 
Join Date: Nov 2011
Posts: 8
Rep Power: 5
HLYBoy is on a distinguished road
The Fluent Guide says that the range of y+ values for which wall functions are suitable depends on the Reynolds number, but the lower limit lies in the order of y* or about 15, so I went by that definition.
HLYBoy is offline   Reply With Quote

Reply

Tags
fluent, yplus

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
node values vs. no node values in fluent user0314 FLUENT 3 February 6, 2015 06:32
Ansys FLUENT UDF - Velocity profile (of known values) across edge / surface emmkell Fluent UDF and Scheme Programming 2 October 21, 2011 13:12
Scripting Fluent, reference values? Unneoetech FLUENT 0 May 9, 2011 11:57
Why's FLUENT changing the reference values? siw FLUENT 0 November 6, 2008 14:17
Getting values from fluent solver Moshiur R. Chowdhury FLUENT 2 November 27, 2002 14:41


All times are GMT -4. The time now is 04:06.