Calculation of Thrust and Drag Characteristics for Ship′s Propulsion Mechanism of Weis-Fogh Type

Calculation of Thrust and Drag Characteristics for Ship′s Propulsion Mechanism of Weis-Fogh Type

The flow field if a ship's propulsion mechanism of Weis-Fogh type is studied by the discrete vertex method. The wing in a channel is approximated by a finite number of bound vortices, and free vortices representing the separated flow are introduced from the trailing edge if the wing. The time histories of the thrust, the drag, and the moment acting on the wing are calculated, including the unsteady force due to the change of strength of the bound vortices. These calculated values agree well with the experimental values. The flow field of this propulsion mechanism is numerically clarified.