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Research Papers: Flows in Complex Systems

Cloud Cavitating Flow Over a Submerged Axisymmetric Projectile and Comparison Between Two-Dimensional RANS and Three-Dimensional Large-Eddy Simulation Methods

[+] Author and Article Information
Yiwei Wang

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

Chenguang Huang

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

Xin Fang

The State Key Laboratory of
Nonlinear Mechanics,
Institute of Mechanics,
Chinese Academy of Sciences,
No. 15 Beisihuanxi Road,
Beijing 100190, China

Xianian Yu, Xiaocui Wu, Tezhuan Du

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

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received April 7, 2015; final manuscript received November 12, 2015; published online February 17, 2016. Assoc. Editor: Samuel Paolucci.

J. Fluids Eng 138(6), 061102 (Feb 17, 2016) (10 pages) Paper No: FE-15-1246; doi: 10.1115/1.4032293 History: Received April 07, 2015; Revised November 12, 2015

For the cloud cavitation around slender axisymmetric projectiles, a two-dimensional (2D) numerical method was based on the mixture approach with Singhal cavitation model and modified renormalization-group (RNG) k–ε turbulence model, and a three-dimensional (3D) method was established with large-eddy simulation (LES) and volume of fraction (VOF) approach. The commercial computational fluid dynamic (CFD) software fluent is used for the 2D simulation, and the open source code OpenFOAM is adopted for the 3D calculation. Experimental and numerical results were presented on a typical case, in which the projectile moves with a quasi-constant axial speed. Simulation results agree well with experimental results. An analysis of the evolution of cavitating flow was performed, and the related physical mechanism was discussed. Results demonstrate that shedding cavity collapse plays an important role in the generation and acceleration of re-entry jet, which is the main reason for the instability of cloud cavitation. The 2D Reynolds-Averaged Navier–Stokes (RANS) method can represent the physical phenomena effectively. The 3D LES method can give an efficient simulation on the shedding vortices, and considerable accurate shapes of shedding cavities are captured.

Copyright © 2016 by ASME
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References

Figures

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Fig. 1

Underwater launch system: 1—SHPB launcher, 2—incident bar, 3—transfer bar, 4—sliding scale, 5—cavitator, 6—strain gauge, 7—bridge and amplifier, 8—data-processing system, 9—high-speed camera, and 10—launch support

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Fig. 2

Schematic diagram of water tank

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Fig. 3

Experimental model in water tank

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Fig. 4

Typical cavitation photograph

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Fig. 5

Computational domain and mesh

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Fig. 6

Computational domain of the 3D method

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Fig. 7

Mesh near the head of the vehicle of the 3D method

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Fig. 8

Typical cavitation patterns in stage 1 and 2

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Fig. 9

Time evolution of cavitation patterns obtained from the experiment and simulation

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Fig. 17

Time sequence of the isosurfaces on which the vorticity magnitude is 5000 s−1

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Fig. 16

Time sequence of vorticity magnitude contours on the slice of the 3D results

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Fig. 15

Time sequence of turbulent kinetic energy contours

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Fig. 14

Time sequence of pressure and velocity distributions in the flow field

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Fig. 13

Time history pressure coefficients at different points along the wall

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Fig. 12

Time sequence of pressure and velocity distributions along the line paralleled to the axis (2)

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Fig. 11

Time sequence of pressure and velocity distributions along the line paralleled to the axis (1)

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Fig. 10

Numerical and experimental results of cavity length and thickness

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