期刊
OCEAN ENGINEERING
卷 87, 期 -, 页码 64-77出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2014.05.005
关键词
Cavitation; Homogeneous model; Hydrofoil; Vortical flow; 3D structure
资金
- National Natural Science Foundation of China [51206087, 51179091]
- Major National Scientific Instrument and Equipment Development Project [2011YQ07004901]
- China Postdoctoral Science Foundation [2011M500314, 2012T50090]
Recent experiments showed that there is an interaction between the fluid vortex formation and cavitation, but the mechanism is still an open problem. In the present paper, the structure of the cavitating flow around a twisted hydrofoil was investigated numerically using the mass transfer cavitation model and the modified RNG k-epsilon model with a local density correction for turbulent eddy viscosity. The predicted three dimensional cavity structures and the shedding frequency agree fairly well with experimental observations. Three types of flow behavior along the suction side of the twisted hydrofoil are discussed. Further analysis of the flow field reveals that cavitation promotes vortex production and increases the boundary layer thickness with local separation and the flow unsteadiness. Finally, the influence of cavitation on the vorticity distribution is illustrated using the vorticity transport equation in a variable density flow and is demonstrated by the contribution of vortex stretching, vortex dilatation and baroclinic torque terms. (C) 2014 Elsevier Ltd. All rights reserved.
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