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Research Papers: Multiphase Flows

Numerical Simulation of Three-Dimensional Cavitation Around a Hydrofoil

[+] Author and Article Information
Jing Yang

College of Water Conservancy and Civil Engineering,  China Agricultural University, Beijing, China 100083yangjingshirley@163.com

Lingjiu Zhou

College of Water Conservancy and Civil Engineering,  China Agricultural University, Beijing, China 100083

Zhengwei Wang

Department of Thermal Engineering,  Tsinghua University, Beijing, China 100084wzw@mail.tsinghua.edu.cn

J. Fluids Eng 133(8), 081301 (Aug 16, 2011) (9 pages) doi:10.1115/1.4004385 History: Received May 12, 2010; Accepted June 08, 2011; Published August 16, 2011; Online August 16, 2011

Cavitation around a hydrofoil has significant three-dimensional features. The full cavitation model and a RNG k−ɛ turbulence model with a modified turbulence viscosity coefficient and which related to the vapor and liquid densities in the cavitating region were used to simulate cavitation around a hydrofoil, with emphasizing on cavity’s three-dimensional features. Computations were made on the three-dimensional flow field around a NACA66 hydrofoil at a 6 deg angle of attack. The results show that the shedding frequency on the 3D hydrofoil agrees well with the experimental data. The computed results also capture the main feature of the 3D cavitation, which had a crescent shaped cavity because of the span wise velocity. This span wise velocity is due to the span wise pressure gradient caused by the lateral vortex near the side wall of the tunnel.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Calculation domain and boundary conditions

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Figure 2

Mesh around the hydrofoil

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Figure 3

Comparison of the three grids calculated results

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Figure 4

Pressure fluctuation monitors on suction side

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Figure 5

Comparison with experimental data of pressure coefficient for four cavitation numbers

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Figure 6

Vapor volume fraction iso-surface for the three-dimensional cloud cavitation during one cycle self-oscillation cycle for a hydrofoil with a 192 mm span and a 6 deg attack. The time between consecutive images is t = 0.03 s, except (h) and (i) is 0.075 s, (i) and (j) is 0.225 s.

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Figure 7

Comparing of calculated pressure fluctuations and experimental pressure during cavity growth and destabilization in the middle span of suction side

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Figure 8

The velocity vector of three-dimensional cloud cavitation on hydrofoil suction side during one cycle of self-oscillation of a = 6 deg, b = 192 mm. The time between two consecutive images is t = 0.03s, except (h) and (i) is 0.075 s, ( i) and (j) is 0.225 s.

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Figure 9

Streamlines on the hydrofoil suction side of a suction side noncavitating flow

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Figure 10

Streamlines on the hydrofoil of a cavitating two phase flow t = 2.19 s

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Figure 11

(a) Pressure distribution for the noncavitating flow and (b) the cavitating flow in section A. ((b) corresponding to Fig. 5, t = 2.25 s), (c) pressure distribution for the noncavitating flow and (d) the cavitating flow in section B. ((d) corresponding to Fig. 5, t = 2.25 s).

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Figure 12

The pressure fluctuations during cavity growth and destabilization at different spans on the suction side. (a), (b), (c) Mean the difference of spanwise pressure fluctuations.

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