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Modelling and Simulation in Engineering
Volume 2011, Article ID 257539, 9 pages
Research Article

Investigation of Boundary Effects on the Natural Cavitating Flow around a 2D Wedge in Shallow Water

Xin Chen,1,2 Ying Chen,1,2 Jia-Yi Cao,1,2 and Jie Li1,2

1Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240, China
2MOE Key Laboratory of Hydrodynamics, SJTU, Shanghai 200240, China

Received 8 July 2011; Accepted 31 October 2011

Academic Editor: Antonio Munjiza

Copyright © 2011 Xin Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


When a cavitated body moves in shallow water, both flexible free surface and rigid bottom wall will produce great influence on the cavity pattern and hydrodynamics to change the motion attitude and stability of the body. In this paper, a single-fluid multiphase flow method coupled with a natural cavitation model was employed to study the effects of two kinds of boundaries on the natural cavitating flow around a two-dimensional symmetry wedge in shallow water. Within the range of the cavitation number for computation (0.05 ~ 2.04), the cavity pattern would be divided into three types, namely, stable type, transition type and wake-vortex type. The shape of the free surface is fairly similar to that of the cavity's upper surface with well right-and-left symmetry. However, when the immersion depth and the cavitation number are decreasing, the symmetry of the cavity shape is destroyed due to the influence of bottom wall effects. When the cavitation number is less than about 0.1, with the immersion depth going down, free surface effects exerts a stronger influence on the drag coefficient of this 2D wedge, whereas wall effects bring a stronger influence on the lift coefficient.