Learning Forum

[Antoine]

Hi all,

For my project I am ask to study the laminar-turbulent flow transition around an aerofoil (Eppler387 aerofoil). To do this I am using Fluent and the k-kl-omega transition model. 

The thing is, I don't know how to visualize the transition in post-processing...

Can you help me on that ? 

I've looked for tutorials and stuff but could not found anything concerning the k-kl-omega..

Thank you in advance. 

 

Antoine

[Rob]

Have a look in the Turbulence part of the post-processing: there are likely some variable there. Using those look in the User'S Guide for the alphanumeric definitions (one of the last chapters) where all of these variables are defined.

[Antoine]

Thank you ! 

I will check that and come back to you whether it works or not 

[Antoine]

Have a look in the Turbulence part of the post-processing: there are likely some variable there. Using those look in the User'S Guide for the alphanumeric definitions (one of the last chapters) where all of these variables are defined.

Hi rwoolhou, I have found the turbulence variables you were talking about. I've actually plotted some of them. 

Do you know which one will be the best to predict the transition ? 

I have plotted the eddy viscosity contour, the turbulent viscosity, the specific dissipation rate (omega) and the turbulent kinetic energy. All theses come from my analysis of the Eppler-387 aerofoil. 

[Rob]

Not sure without doing some reading (and as you're the student you can do that!). If you look at the various options I suspect you'll want some sort of ratio/relationship between turbulent/laminar viscosity or generation/dissipation rates or the like  (check the definition of Turbulent Reynolds Number (Re_y) ). 

What do Stokes & Reynolds have to say on the subject?