[smcg1849]

Hi guys,

at the moment i am working on a student project which is about a open rotor turboprop. In this project i have to study the air flow in front of the inlet to the engine.

Anyway the propeller has 9 blades. To get faster results of the first simulations, iam working with periodic conditions of course. In this case I defined a rotating domain which contains the blade + hub and a stationary domain which simulates the far field around the blades. This is shown in the image below.


Please have a look to the fluid-fluid interfaces.
My question is related to the red surrounded fluid-fluid interface:

Is this interface numerical valid? Iam asking this question because in my lecture interfaces are supposed to be orthogonal to the flow, which is not given in this case (interface surface is tangential to the inlet flow).

Am I right about this? If yes, how can I solve this problem? Which Interface settings have to be made in this case? I am really confused about this. Can you help me?

Thanks a lot in advance!

Greetings
Chris