Research Papers: Multiphase Flows

Study of Characteristics of Cloud Cavity Around Axisymmetric Projectile by Large Eddy Simulation

[+] Author and Article Information
Xianxian Yu, Chenguang Huang, Tezhuan Du, Lijuan Liao, Xiaocui Wu

Key Laboratory for Mechanics in Fluid
Solid Coupling Systems,
Institute of Mechanics,
Chinese Academy of Sciences,
No. 15 of Beisihuanxi Road,
Beijing 100190, China

Zhi Zheng

School of Energy and Power Engineering,
Lanzhou University of Technology,
Lanzhou, Gansu 730050, China

Yiwei Wang

Key Laboratory for Mechanics in Fluid
Solid Coupling Systems,
Institute of Mechanics,
Chinese Academy of Sciences,
No. 15 of Beisihuanxi Road,
Beijing 100190, China
e-mail: wangyw@imech.ac.cn

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received April 3, 2013; final manuscript received January 14, 2014; published online March 17, 2014. Assoc. Editor: Olivier Coutier-Delgosha.

J. Fluids Eng 136(5), 051303 (Mar 17, 2014) (8 pages) Paper No: FE-13-1216; doi: 10.1115/1.4026583 History: Received April 03, 2013; Revised January 14, 2014

Cavitation generally occurs where the pressure is lower than the saturated vapor pressure. Based on large eddy simulation (LES) methodology, an approach is developed to simulate dynamic behaviors of cavitation, using k-μ transport equation for subgrid terms combined with volume of fluid (VOF) description of cavitation and the Kunz model for mass transfer. The computation model is applied in a 3D field with an axisymmetric projectile at cavitation number σ = 0.58. Evolution of cavitation in simulation is consistent with the experiment. Clear understanding about cavitation can be obtained from the simulation in which many details and mechanisms are present. The phenomenon of boundary separation and re-entry jet are observed. Re-entry jet plays an important role in the bubble shedding.

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Fig. 1

Computational model and domain

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Fig. 2

Computational mesh

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Fig. 3

Underwater launch system

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Fig. 4

Projectile model in water tank

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Fig. 5

Length of cavity in experimental picture at t = 11.0 ms

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Fig. 6

Evolution of cloud cavitation

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Fig. 7

Numerical and experimental results of cavity length

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Fig. 8

Flow field of cavity closure at t = 1.0 ms

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Fig. 9

Re-entry jet at the cavity closure at t = 2.0 ms

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Fig. 10

Separation of boundary layer at t = 2.0 ms

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Fig. 11

The transparent cavity before re-entrant jet formed at t = 2.2 ms

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Fig. 12

Re-entrant jet in experiment

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Fig. 13

Re-entrant jet in simulation

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Fig. 14

Numerical and experimental l/L

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Fig. 15

Evolution of shedding bubble

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Fig. 16

Collapse of shedding bubble in simulation

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Fig. 17

Collapse of shedding bubble in experiment




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