Unformatted text preview: upward to inﬁnity and had width L as shown below. Show that the circulation about this box does not change with time. What is the signiﬁcance of this in terms of the vorticity creation? What would be diﬀerent (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 ﬂow 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
 Shear Stress, Fundamental physics concepts, upper layer

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