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2d rotational wall and the velocity magnitude in top??!!

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Old   May 2, 2013, 03:50
Unhappy 2d rotational wall and the velocity magnitude in top??!!
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Suppose that we have an edge as a blade as a rotational wall (2d problem), it rotates about its center.
Radius of this blade= 10 m
Rotational speed= 1 rad/ s
I used moving reference frame, and I set the speed of rotational wall 0 (relative).
Originally, the velocity magnitude in the top of the blade has to be 10 m/s. but I get it 7.8 m/s
In fact the wall don't obey from:
also velocity magnitude in the axis is not zero m/s.
What's the problem??? What's your idea??
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