CFD Online Logo CFD Online URL
Home > Forums > CFX

Lift Coefficent - Advanced Model Control

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

LinkBack Thread Tools Display Modes
Old   September 21, 2006, 04:02
Default Lift Coefficent - Advanced Model Control
Posts: n/a

I have a subsonic flow over a airfoil. My CL does not decrease by a high angle of attack. My Y+<2. Where can I set the crictical Re or where can I set a point for the flow to start changing from laminar to turbulent? In Turbulence Model - Advanced Model Control I can change many Coefficient (e.g. A1, k, BC, Beta Star, C) is there somewhere a help for these Coefficient, where I can see which Size and what happens when I change one. What else can I do? Thanks a lot for your help. Alex
  Reply With Quote

Old   September 21, 2006, 05:27
Default Re: Lift Coefficent - Advanced Model Control
Posts: n/a
Search the help file for the turbulence transition model.
  Reply With Quote

Old   September 25, 2006, 09:25
Default Re: Lift Coefficent - Advanced Model Control
Posts: n/a
thanks for the help. I decided to use the Gamma Model. the default value for the Transition Onset Reynold is 260. How do I calculate this value? I found:

Re_theta_c= 803,73*(Tu+0,6067)^-1,027*F(lamda,K)

F(lamda,k)= 1-(lamda*....)*e^Tu

Is this correct? How do I calculate Lamda(Pressure gradient parameter)?

Is it possible to calulate a critical Renoldsnumber via Re=x*u/v and enter this.

Thanks again
  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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lift coefficient in Eulerian multiphase model hennas FLUENT 1 July 4, 2011 16:50
Swirl Control - Injector Model varunrajendra FLUENT 0 September 16, 2009 09:06
Get the lift force in Eulerian multiphase model Summer FLUENT 0 July 29, 2008 11:27
Lift coefficients for Eulerian Multiphase Model Anastasios Georgoulas FLUENT 0 July 14, 2008 06:13
DPM model w/ Wave model - errors in documentation HS FLUENT 0 April 12, 2006 04:37

All times are GMT -4. The time now is 22:13.