Question

When immersed in a uniform stream, a thick elliptical cylinder creates a broad downstream wake, as idealized in Fig. P3.72. The pressure at the upstream and downstream sections are approximately equal, and the fluid is water at20°C. If Un = 4 m/s and L = 80 cm, estimate the drag force on the cylinder per unit width into the paper. Also compute the dimensionless drag coefficient Ca = 2Fl(pU2,bL).

Fig: 1