CFD Online URL
[Sponsors]
Home > Forums > FLUENT

How to Reduce Wall Y-Plus

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 23, 2006, 10:13
Default How to Reduce Wall Y-Plus
  #1
rams
Guest
 
Posts: n/a
Freinds I have solved a combustion problem using non premixed combustion model in Fluent. Am getting every thing correct but, getting a high value of wall y-plus,...

can any one tell me how to reduce wall Y-Plus,...

waiting for u'r reply,...

regards,.....

rams
  Reply With Quote

Old   July 24, 2006, 02:56
Default Re: How to Reduce Wall Y-Plus
  #2
Marina
Guest
 
Posts: n/a
Go to Adapt - Yplus/Ystar panel... Turn on Refine option, select wall zones yoe wih to refine, set the min and max allowed values of Yplus, and click Adapt ...

  Reply With Quote

Old   July 25, 2006, 04:27
Default Re: How to Reduce Wall Y-Plus
  #3
Ralf Schmidt
Guest
 
Posts: n/a
Hi!

The adapt option is ok, BUT: most of the time, it can only dubble or half the y+ values, because the position of the nodes can not be changed with that option. So changing of yplus means to add or remove a node, and the addition can only happend in the middle of a cell.

One hint: Use the smooth/swap option after adapting yplus, do some iterations until convergens, than do the yplus adaption again.

Much better is it, to build a grid with the right yplus from the beginning. Use sizing function and/or Boundary layer option in gambit.

To estimate yplus, have a look at: http://www.cfd-online.com/Forum/main...cgi?read=44320

Ralf
  Reply With Quote

Old   July 25, 2006, 04:36
Default Re: How to Reduce Wall Y-Plus
  #4
Albert Franco
Guest
 
Posts: n/a
I would build a grid imposing the yplus that I wanted, and then recalculating the cell size. As I know you need to estimate velocity of the adjacent flow, carachterist length of the problem, Cf and Ue.

  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
Very technical question about solving wall boundary layer ... jlb001 FLUENT 4 Yesterday 09:09
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
UDF for wall slipping HFLUENT Fluent UDF and Scheme Programming 0 April 27, 2011 13:03
Wall functions? Pr Main CFD Forum 7 April 8, 2004 07:15
Quick Question - Wall Function D.Tandra Main CFD Forum 2 March 16, 2004 05:29


All times are GMT -4. The time now is 02:00.