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Airfoil + Spinning Wheel Problem

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Old   July 24, 2017, 10:41
Smile Airfoil + Spinning Wheel Problem
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I'm trying to study the effect of a spinning wheel placed right behind a airfoil. After I ran the study on fluent, i went on to check the velocity stream function and it doesn't make much sense to me mainly because of the velocity direction of the flow on the pressure surface. As you can see, the flow comes from the left to the right but at some point it reverses and it flows trough this surface on the opposite direction.
I'm kind of new to CFD so any help is very welcome on explaining me why is this happening and also why doesnt the flow velocity follow the wheel direction when it's close to it. I uploaded somes images so that you can have a better understanding of the problem.

Useful data:
Flow velocity an inlet: 15 m/s
Ground Velocity: 15 m/s
Wheel Rotational Velocity: 65.6 rad/s (counterclockwise)




Thank you!!
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airfoil, stream function, wheel

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