Consider irrotational flow at velocity U past a half-cylinder of radius R and length L, as in Fig. P9.2. A numerical solution for the velocity potential would be needed to obtain precise results for the velocity and pressure fields. However, as a first approximation, suppose that the flow for y > 0 is like that past a complete cylinder and the flow for y < 0 is like that past a flat plate. Calculate the lift force, F_L.

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1 - 1 y Figure P9.2 Potential flow past a half-cylinder. R X