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-   -   Stage Interface errors & requirements (http://www.cfd-online.com/Forums/cfx/116249-stage-interface-errors-requirements.html)

Teradil April 16, 2013 02:36

Stage Interface errors & requirements
 
Hello everybody,

first: Thank you very much for this forum and the FAQ! Helped me a lot!

But now i have a problem and don't find the problem..

I want to calculate a cavity chamber as rotating domain with a inflow from a non-rotating domain. So i modeled the two domains, the chamber and the inflow, and connected them with a stage interface. The chamber has a 120 symmetry and i modeled the inflow as a 10 part.
The calculation is always hardly diverging at the stage interface. I can bring it to converge if i use a frozen rotor. But surely then i only have a local inflow.

So my questions are:

1) Are there special requirements for the axial and circumferential velocity (for stage interfaces)? Because i only have a very small axial flow through the interface compared to the circumferential velocity..

2) I found some local backflows over the interface.. How stable is a stage interface with this kind of initial problems?


I hope you can give me some advice from your experience with the stage interfaces about its stability and special requirements..

Thanks a lot :)


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