[Aeronaut_Frenzy]

Hello Everyone,
I hope you all are doing great. I was doing some analysis of the rotor(have it's own volume which will rotate) in a duct (which is attached to the aircraft). The basic approach was for me to follow this tutorial:



https://www.youtube.com/watch?v=KFrZoDWUC5s&t=659s By Mr. Raef.

Very helpful video. I was able to pull it off. But I am really confused by the boundary that I have shown in the figure.



I do not understand why there is a so much abrupt difference at the interface outside region and rotor region. I was hoping for a continuous flow.



Conditions used:
velocity inlet: 10 m/s
rpm: 15000 (but, I want to test at 48000)


Any advice will be appreciated from a fellow CFD passionate.


Thank you,


Regards,
Aeronaut Frenzy

[Gert-Jan]

You problem is related to the following FAQ



https://www.cfd-online.com/Wiki/Ansy...f_reference.3F