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

Tke pike

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 6, 2011, 10:51
Default Tke pike
  #1
New Member
 
Join Date: Nov 2011
Posts: 1
Rep Power: 0
rg12g09 is on a distinguished road
Hi
I am reasonably new to Star and trying to simulate flow over an isolated ridge.
I have Tke and Tke disp as boundary coniditions at my inlet and initally the velocity profile produced is accurate to wind tunnnel experimental results I am trying to validate.
After 300 or so iterations the velocity at the crest no longer shows the expected velocity increase near to the surface.

When the TKE and TKE disp values are plotted I have a huge spike of Tke very close to the wall which gradually does decrease but not completly. This the causes a large change in Tke disp
I understand this is whats causing the incorrect velocity profile but am not sure how to prevent it occuring. Is this a failure of the wall functions ?
I have tried runnning the model using various turbulence models (currently using low y+ Ke realised) and many different y+ values varying from 0.019 to 2.

Thanks
rg12g09 is offline   Reply With Quote

Reply

Tags
turbulent kinetic energy

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
How to calculation TKE in LES lizzy0zhou Main CFD Forum 4 February 11, 2011 14:05
TKE for steady simulation kp FLUENT 2 March 16, 2009 04:53
definition of TKE and its relationship to buoyancy winter Main CFD Forum 0 December 10, 2007 17:34
Stirred tank, TKE, DES, RSM J. Gimbun FLUENT 0 February 21, 2006 06:57
TKE SPECTRUM & DISSIPATION Christian Paukert Main CFD Forum 2 March 14, 2001 20:34


All times are GMT -4. The time now is 21:55.