A simple method of investigation of the Froude number effect on lifting flows about ships

Lifting effects on steady flows around ships for various va lues of the Fro ude number are investigated using a lifting surface method for zero thickne ss bodies with the steady wave resistance Green's function. To obtain very short computational times, the Fourier integrals are computed using a Rombe rg method with a given precision after interchanging the space and Fourier integrations. With this simple computing scheme, an efficient method for th e prediction of lifting effects has been achieved. Computations have been l ed at various Froude numbers for sailing boats with yaw and heel angles, an d for rudders, with and without simulation of the interaction with the hull . Simulation of some upstream flows, uniform and nonuniform, are also inves tigated.