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Unformatted text preview: upward to innity and had width L as shown below. Show that the circulation about this box does not change with time. What is the signicance of this in terms of the vorticity creation? What would be dierent (in terms of vorticity creation) if the velocity of the wall was changing in time? L U 6. (OPTIONAL 2) Explain, with words and equations, why potential ow theory cannot be used to describe a rotating cylinder whose rate of rotation is changing in time. In particular, try to connect this problem with the Rayleigh problem....
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 Spring '09
 ELDRIDGE

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