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research-article

Cloud Cavitating Flow that Surrounds a Vertical Hydrofoil near the Free Surface

[+] Author and Article Information
Chang Xu

Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences School of Engineering Science, University of Chinese Academy of Sciences
xuchang@imech.ac.cn

Yiwei Wang

Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences School of Engineering Science, University of Chinese Academy of Sciences
wangyw@imech.ac.cn

Chenguang Huang

Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences School of Engineering Science, University of Chinese Academy of Sciences
Huangcg@imech.ac.cn

Chao Yu

Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences School of Engineering Science, University of Chinese Academy of Sciences
yuchaohust@163.com

Jian Huang

Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences School of Engineering Science, University of Chinese Academy of Sciences
huangjian@imech.ac.cn

1Corresponding author.

ASME doi:10.1115/1.4036669 History: Received December 15, 2016; Revised April 12, 2017
Article

Abstract

Unstable cavitation presents an important speed barrier for underwater vehicles such as hydrofoil craft. In this paper, the authors concern about the physical problem about the cloud cavitating flow that surrounds an underwater launched hydrofoil the near free surface at relatively high Froude number, which has not been discussed in previous research. A water tank experiment and computational fluid dynamics simulation are conducted in this paper. The cavity evolution process in the experiment involves three stages, namely, cavity growth, shedding, and collapse. Numerical methods adopt large eddy simulation with Cartesian cut-cell mesh. Given that the speed of the model changes during the experiment, this paper examines cases with varying constant speeds. The free surface effects on the cavity, re-entry jet location, and vortex structures are analyzed based on the numerical results.
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