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

k-kl-omega and near wall treatment

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 20, 2013, 05:49
Question k-kl-omega and near wall treatment
  #1
New Member
 
Tamara Annabelle
Join Date: Jul 2013
Posts: 26
Rep Power: 3
Marabelle is on a distinguished road
I am calculating with the k-kl-w Method (Transition model). The k-kl-w Model has no integrated wall functions resp. near walltreatment.Thus I have to refine the mesh close to the walls. The right side of my model (s. pictures) is at the same time the inlet, then the fluid flows to the top. So I have only a boundary layer on the left side and therefore I only have to refine on that side, if I understood everything right. The student who worked on this model before also refined the right side and so did I... until now. I wanted to see the difference which is actually quite big: The mean Nusselt value is three times bigger and the heat transfer thus about 2,5 times bigger. The first cell height is only 7E-04mm higher and the y+ rose from 0.6 to 1.3.
My questions are now:
1. Do I really have to refine only on the left side?
2. if so, shoud/will I reach the same values as before when refining the entire mesh (and thus ameliorating y+)
3. can I define the hight of the first cell/layer somewhere? At the moment I am "regulating" it through the Bias factor and Sections in x-/y-direction and read out the coordinates of the nodes in x-/y-direction... quite laborious...
Thanks for your answers in advance! I would really apreciate them, because the only one here in the institute who knows such stuff more in detail is ill/on holydays since two weeks...
Marabelle 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 05:37.