Large Eddy Simulation of Turbulent Attached Cavitating Flows around Different Twisted Hydrofoils

Changli Hu, Guanghao Chen, Long Yang and Guoyu Wang
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Changli Hu: School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Guanghao Chen: Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems, Nanjing 211100, China
Long Yang: School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Guoyu Wang: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

Energies, 2018, vol. 11, issue 10, 1-15

Abstract: In this paper, the turbulent attached cavitating flows around two different twisted hydrofoils, named as NACA0009 and Clark-y, are studied numerically, with emphasis on cavity shedding dynamic behavior and the turbulence flow structures. The computational method of large eddy simulation (LES) coupled with a homogeneous cavitation model is applied and assessed by previous experimental data. It was found that the predicted results were in good agreement with that of the experiment. The unsteady cavity morphology of the two hydrofoils undergoes a similar quasi-periodic process, but has different shedding dynamic behavior. The scale of the U-type shedding structures forming on the suction surface of NACA0009 is larger than that of Clark-y. This phenomenon is also present in the iso-surface distributions of Q -criterion. Otherwise, the time-averaged cavity morphology is dramatically different for the two hydrofoils, and it is found that the attached location of the cavity is closely related to the hydrofoil geometry. The time fluctuation of the lift force coefficients is affected significantly by the cavity shedding dynamics. Compared with NACA0009, the lift force of Clark-y shows more fluctuation, due to its complicated shedding behavior. Further analysis of the turbulent structure indicates that the more violent shedding behaviors can induce higher levels of turbulence velocity fluctuations.

Keywords: unsteady cavitating flows; large eddy simulation (LES); U-type shedding structures; twisted hydrofoil (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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