Comparative Study of Different Turbulence Models for Cavitational Flows around NACA0012 Hydrofoil

被引:10
|
作者
Zhao, Minsheng [1 ]
Wan, Decheng [1 ,2 ]
Gao, Yangyang [2 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, Computat Marine Hydrodynam Lab CMHL, Shanghai 200240, Peoples R China
[2] Zhejiang Univ, Ocean Coll, Zhoushan 316021, Peoples R China
关键词
cavitation; NACA0012; modified SST k-omega model; large eddy simulation; REENTRANT JET;
D O I
10.3390/jmse9070742
中图分类号
U6 [水路运输]; P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
The present work focuses on the comparison of the numerical simulation of sheet/cloud cavitation with the Reynolds Average Navier-Stokes and Large Eddy Simulation(RANS and LES) methods around NACA0012 hydrofoil in water flow. Three kinds of turbulence models-SST k-omega, modified SST k-omega, and Smagorinsky's model-were used in this paper. The unstable sheet cavity and periodic shedding of the sheet/cloud cavitation were predicted, and the simulation results, namelycavitation shape, shedding frequency, and the lift and the drag coefficients of those three turbulence models, were analyzed and compared with each other. The numerical results above were basically in accordance with experimental ones. It was found that the modified SST k-omega and Smagorinsky turbulence models performed better in the aspects of cavitation shape, shedding frequency, and capturing the unsteady cavitation vortex cluster in the developing and shedding period of the cavitation at the cavitation number sigma = 0.8. At a small angle of attack, the modified SST k-omega model was more accurate and practical than the other two models. However, at a large angle of attack, the Smagorinsky model of the LES method was able to give specific information in the cavitation flow field, which RANS method could not give. Further study showed that the vortex structure of the wing is the main cause of cavitation shedding.
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页数:20
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