CFD Online Logo CFD Online URL
Home > Forums > FLUENT


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

LinkBack Thread Tools Display Modes
Old   January 16, 2008, 11:28
Default Transitionmodeling
Posts: n/a

I'm modeling transition through free convection around a horizontal cylinder. When using the SST k-omega model without a roughness height I get a flow that is laminar, however when putting the roughness height to a value around 2.5 cm I get a turbulent transition.

My y+ values are below 1 and the first cell height is less than 1 mm. The manual states that the roughness height shouldn't be set to a value higher than half the height of the first cell, which I have done.

Can I apply surface roughness with such a small y+ and thin boundary layer? Would be glad for any hints or suggestion concerning transition modeling!
  Reply With Quote


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 03:01.