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I don't understand these results for my boundary layer simulation with a moving wall

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Old   February 6, 2023, 10:17
Default I don't understand these results for my boundary layer simulation with a moving wall
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Hello, I wanted to try to simulate a flow around a profile (I did it quickly so it may not be really "clean") and compare the flow between a profile with a moving wall and one with a static wall.

The input velocity was 50m/s and the angle was 15°, I got this :


Screenshot_20230203-171637_Messenger.jpg
Screenshot_20230203-171634_Messenger.jpg

The first picture is with a mobile wall condition (with V = 50m/s), and what I don't understand is that I always heard that aerodynamic stall was a boundary layer separation where the boudary layer enlarges, but if the boundary layer has a velocity of 50m/s, why is there static air here ?

Also I tested with an angle of 0 but with an input velocity of 150m/s and I got this :

Screenshot_20230203-171650_Messenger.jpg
Screenshot_20230203-171647_Messenger.jpg


The three last values (at the bottom) are firstly the drag for the moving (or static) wall, secondly the lift force (not coefficient) of the whole profile, and lastly the drag force for the whole profile. And we can observe a lift force of -100N whereas it is a symetric profile with an angle of 0, there shouldn't be a lift force

I used k-omega SST model as I heard it was adapted for these simulations.

Thanks in advance
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