Question

7. A crude model of a tornado in air is formed by combining a ree vortex of circulation Г--6x 104 m2/s and a sink of strength m :3x104 m3/s. Far from the core, r-но , assume Po-1 am and Vo-0. (a) Write down the stream function for a CCW rotating tornado, (b) At what distance r = RI has the wind speed reached 100 mph and what is the gage pressure Pg at this point? (c) At what distance r-R2 has the gage pressure reached Pg0.1 atm 10 kPa and what is the wind speed at this point? Approx Ans: (b) R1 200 m; Pgl1.6 kPa;; (c) R2-96 m; V2 140 m/s

Answer 1