The potential flow model for a storm is represented by the superposition of a sink and a vortex. The stream function can be written in the $(r, \theta)$ system as $\psi=-\frac{\Lambda}{2 \pi} \theta+\frac{\Gamma}{2 \pi} \ln r,$ where $\Lambda=\Gamma=100 \mathrm{~m}^{2} / \mathrm{s}$. Assume a constant air density of $1.2 \mathrm{~kg} / \mathrm{m}^{3}$. The gauge pressure at a distance of $100 \mathrm{~m}$ from the storm eye is
(A) -\infty
(B) $-\frac{1.2}{\pi^{2}}$
(C) $-\frac{1.2}{2 \pi^{2}}$
(D) $-\frac{1.2}{4 \pi^{2}}$
The potential flow model for a storm is represented by the superposition of a sink and a vortex. The stream function can be written in the $(r, \theta)$ system as $\psi=-\frac{\Lambda}{2 \pi} \theta+\frac{\Gamma}{2 \pi} \ln r,$ where $\Lambda=\Gamma=100 \mathrm{~m}^{2} / \mathrm{s}$. Assume a constant air density of $1.2 \mathrm{~kg} / \mathrm{m}^{3}$. The gauge pressure at a distance of $100 \mathrm{~m}$ from the storm eye is
(A) -\infty
(B) $-\frac{1.2}{\pi^{2}}$
(C) $-\frac{1.2}{2 \pi^{2}}$
(D) $-\frac{1.2}{4 \pi^{2}}$