Numerical Analysis of Unsteady Viscous Flow through Ship's Propulsion Mechanism of Weis-Fogh Type by Advanced Vortex Method

摘要

The velocity and pressure fields of a ship's Weis-Fogh type propulsion mechanism is discussed in this paper using the advanced vortex method. The wing of the NACA0010 and the channel are approximated by a finite number of source and vortex panels, and the free vortices are introduced from the body surfaces. The viscous diffusion of fluid is represented using the core-spreading model to the discrete vortices. The velocity is calculated on the basis of the generalized Biot-Savart law and the pressure field is calculated from an integral based on the instantaneous velocity and vorticity distribution in the flow field. Two-dimensional unsteady viscous flows of this propulsion mechanism are numerically clarified. The calculated results agree well with the experimental results.