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

Y plus

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 18, 2009, 16:44
Default Y plus
  #1
New Member
 
abdul
Join Date: Mar 2009
Posts: 8
Rep Power: 9
abdul is on a distinguished road
I am using different discretization schemes in Fluent to predict accurate results, discretisation schemes such as PRESTO for Pressure, second order upwind for Continuity etc etc

different discretisation schemes for the same 3d model, however when i refine the Yplus values to a certain limit and reducing it so there are 0 cells to refine, the amount of cells that are being refined vary accordingly to the different schemes, does anyone know why?

surely they should be the same amount of cells refined?
abdul is offline   Reply With Quote

Old   April 20, 2009, 08:45
Default
  #2
Senior Member
 
Aroon
Join Date: Apr 2009
Location: Racine WI
Posts: 148
Rep Power: 9
vishyaroon is on a distinguished road
Your y+ values are based on the wall shear stresses. These are going to be as different as the near wall stresses predicted by the schemes you use. So in short you may not end up with the same y+ using different schemes. This is why you observe that you may have to refine your grids over and over again.

Another thing I'd point out is even after you refine the grid, your solution is going to be different from what you had using the coarser grid. Hence you'll again have different y+ values.
vishyaroon is offline   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



All times are GMT -4. The time now is 19:00.