抄録
The flowfield of a ship's propulsion mechanism consisting of two-series wings in a square channel are visualized by numerical simulations using a personal computer and by the hydrogen-bubble technique. The simulations are performed by the discrete vortex method, in which the separations are assumed to occur at the trailing edges of the wings. The stream-lines, the streak-lines, and the time-lines are calculated, the latter two of which are obtained by introducing the tracers at adequate intervals. They agree well with experimental results. The flowfield is unsteady and complex, but the characteristics of the flow are clarified by visualizing numerically.
