Focusing on cavitation phenomena caused by high-speed submerged water jets, this paper presents an improved cavitation model for a compressible fluid mixture based on a concise estimation of fluid compressibility that considers phase change effects. The homogeneous two-phase flow assumption is adopted, and the gas phase is assumed to consist of vapor and non-condensable components. Equations of state for a pure liquid and an ideal gas are employed to evaluate the compressibility of the liquid and non-condensable components, and the compressibility of the vapor is treated semi-empirically as a constant. The model is embedded in an unsteady Reynolds-averaged Navier–Stokes solver, with the realizable k-ε model employed to evaluate the eddy viscosity. The turbulent cavitating flow caused by an impulsively started submerged water jet is treated. The pattern of periodic cavitation cloud shedding is acceptably captured, and the mass flow rate coefficient and its fluctuation frequency evaluated by simulations agree with the experimental results well. The validity of the proposed method is confirmed. The results reveal that cavitation occurs when reaches 0.65 and fluid flow begins to pulsate. In the well-developed stage, the leading cavitation cloud and a subsequent cloud are successively shed downstream, and this process is repeated. The subsequent cloud catches the leading cloud, and they coalesce in the range 2–3. The pressure fluctuations concentrate in the range of corresponding to the periodic shedding of cavitation clouds. The mass flow rate coefficient pulsates from under the effect of cavitation.
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July 2023
Research Article|
July 28 2023
Numerical simulations of cavitating water jet by an improved cavitation model of compressible mixture flow with an emphasis on phase change effects
Special Collection:
Cavitation
Taihei Onishi (大西泰平);
Taihei Onishi (大西泰平)
a)
(Conceptualization, Data curation, Investigation, Methodology, Writing – original draft, Writing – review & editing)
1
College of Engineering, Nihon University
, Koriyama, Fukushima 963-8642, Japan
2
SU Endoscope Development Department, Olympus Corporation
, Hachioji, Tokyo 192-8507, Japan
a)Authors to whom correspondence should be addressed: taihei.ohnishi531@gmail.com and peng@mech.ce.nihon-u.ac.jp
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Yanbo Peng (彭 彦博);
Yanbo Peng (彭 彦博)
(Investigation, Methodology, Visualization, Writing – review & editing)
3
College of Energy and Power Engineering, Lanzhou University of Technology
, Lanzhou, Gansu 730050, China
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Hong Ji (冀 宏)
;
Hong Ji (冀 宏)
(Methodology, Supervision, Writing – review & editing)
3
College of Energy and Power Engineering, Lanzhou University of Technology
, Lanzhou, Gansu 730050, China
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Guoyi Peng (彭 國義)
Guoyi Peng (彭 國義)
a)
(Conceptualization, Data curation, Methodology, Project administration, Supervision, Writing – review & editing)
1
College of Engineering, Nihon University
, Koriyama, Fukushima 963-8642, Japan
a)Authors to whom correspondence should be addressed: taihei.ohnishi531@gmail.com and peng@mech.ce.nihon-u.ac.jp
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a)Authors to whom correspondence should be addressed: taihei.ohnishi531@gmail.com and peng@mech.ce.nihon-u.ac.jp
Physics of Fluids 35, 073333 (2023)
Article history
Received:
April 23 2023
Accepted:
July 10 2023
Citation
Taihei Onishi, Yanbo Peng, Hong Ji, Guoyi Peng; Numerical simulations of cavitating water jet by an improved cavitation model of compressible mixture flow with an emphasis on phase change effects. Physics of Fluids 1 July 2023; 35 (7): 073333. https://doi.org/10.1063/5.0155787
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