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How to simulate a flow field where a rotating object travelling?

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Old   July 22, 2014, 01:25
Default How to simulate a flow field where a rotating object travelling?
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I'd like to simulate a free-rotating object like a baseball traveling in a infinite fluid with gravity.
At first, a semi ball struck in the boundary of a 2D room with a velocity inlet and pressure outlet, but I don't know how to let the ball freely rotate.
Then,I draw a 2D room and a hollow as a ball, but it doesn't work.

Did I missed some model or setup?
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