The maximum value of coefficient of lift ( $\mathrm{C}_{1}$ ) for a $2 \mathrm{D}$ circular cylinder, provided at least one stagnation point lies on the cylinder surface, is predicted by the potential flow theory to be

(A) $\pi / 2$

(B) $\pi$

(C) $2 \pi$

(D) $4 \pi$

The maximum value of coefficient of lift ( $\mathrm{C}_{1}$ ) for a $2 \mathrm{D}$ circular cylinder, provided at least one stagnation point lies on the cylinder surface, is predicted by the potential flow theory to be

(A) $\pi / 2$

(B) $\pi$

(C) $2 \pi$

(D) $4 \pi$

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