Author(s): Yongheng Zu; Peng Lu; Zhijun Li
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Keywords: Drag coefficient; Ridge keel; Vortex; Sheltering effect
Abstract: The two-dimensional flow structure in the wake of a ridge keel was investigated in this paper. The laboratory experimental results of two-component Particle Image Velocimetry (PIV) data are compared with numerical simulations. Vortex shedding area is linearly increased with keel depth and slope angle in both uniform and two-layer flow. And there is a flow velocity decay zone in the wake which is related with the location of vortex center. For the laminar region, we use the results to obtain a skin friction relationship; For the turbulent region, we obtain the velocity decay function of a 45º wedged shape model. The results of the present study provide a priori recommendations for the sheltering function in the parameterization scheme of ice-ocean drag coefficient.
Year: 2020