Abstract
It is important to study the nonlinear interaction of forces on foils and of wake patterns in the flow around cascade of fluid machinery, helicopter rotors, and flaps. In this paper, we tried to solve the unsteady incompressible flow around two two-dimensional oscillating foils by using both the discrete vortex approximation and the surface-singularity method. A numerical analysis has been developed for the wake configuration, the lift and drag on the aerofoils. The effect of the distance between two foils, the stagger angle, and the phase difference of the two oscillating foils is discussed by the numerical results.
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