1 For a stationary, smooth circular cylinder (with D = 10 cm and L = 100 cm) in a uniform flow (with U. = 31 m/s), (a) Determine the drag force and
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1 For a stationary, smooth circular cylinder (with D = 10 cm and L = 100 cm) in a uniform flow
(with U. = 31 m/s),
(a) Determine the drag force and CD for (mean) wake velocity profiles:
u(y) = U. sin-
2a
and u(y) = -
U.y
a
_, respectively. a = 2.2D.
(b) Compare the CD determined with the published data. Discuss the difference, it there is any.
Vair = 0.155 cm /s. Pair = 1.225 kg/m'.
2. Why is there a CL' for a circular cylinder? Discuss its importance.
3. For very low spin ratios (= (D/2U. < 0.5), why is CL < 0 (i.e., a negative Magnus lift) for a
circular cylinder?

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