What's the difference between SA and k-w？How can I choose a proper parameter?
 

What's the difference between SA and k-w model？How can I choose a proper parameter about turbulent kinetic energy and turbulent disspation rate? Thanks a lot!

SA is a one-equation turbulence model made for aerodynamic problems. The k-w model is a two-equation model with a quite broader scope. Better have a look at the fluent help files or some CFD-Book to get some insight.

With "proper parameter" you mean boundary conditions, right? You could read some papers with former studies of your problem to get an idea, what proper boundary conditions could be.

Rodriguez,many thanks to u! U gave me a nice idea to solve my problem.Turbulence is a very complex phenomena.I Have to spend more time understanding the theory.Now I'd better try all kinds of boundary conditions to find a proper one.

I'm not sure if mean the same...
To get an idea of turbulence values at the boundaries, you can read some journal papers written by people that do (more or less) the same as you. Often, you can find values such as turbulent intensity there.

Usually the papers I 've read don't contain any information about the turbulence values.Have you got any literature like this?