Numerical modeling of unsteady cavitating flow over a hydrofoil with consideration of surface curvature

2020 ◽  
Vol 205 ◽  
pp. 107305 ◽  
Author(s):  
Weixiang Ye ◽  
Yunchi Yi ◽  
Xianwu Luo
Keyword(s):  
Numerical Modeling ◽  
Surface Curvature ◽  
Cavitating Flow ◽  
Unsteady Cavitating Flow

Discrete Bubble Modeling of Unsteady Cavitating Flow

2006 ◽  
Vol 4 (5-6) ◽  
pp. 601-616 ◽  
Author(s):  
Zhiliang Xu ◽  
Myoungnyoun Kim ◽  
Tianshi Lu ◽  
Wonho Oh ◽  
James Glimm ◽  
...  
Keyword(s):  
Cavitating Flow ◽  
Unsteady Cavitating Flow

scholarly journals Observation of unsteady cavitating flow in flat plate cascades

2010 ◽  
Vol 12 ◽  
pp. 012047 ◽  
Author(s):  
S Watanabe ◽  
A Ikeda ◽  
I Nakamura ◽  
A Furukawa
Keyword(s):  
Flat Plate ◽  
Cavitating Flow ◽  
Unsteady Cavitating Flow

scholarly journals Numerical analysis of unsteady cavitating flow in an axial inducer

2010 ◽  
Vol 224 (2) ◽  
pp. 223-238 ◽  
Author(s):  
R Campos-Amezcua ◽  
S Khelladi ◽  
F Bakir ◽  
Z Mazur-Czerwiec ◽  
C Sarraf ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Cavitating Flow ◽  
Unsteady Cavitating Flow

Lagrangian Analysis of Unsteady Partial Cavitating Flow Around a Three-Dimensional Hydrofoil

2020 ◽  
Author(s):  
Tingyun Yin ◽  
Giorgio Pavesi ◽  
Ji Pei ◽  
Shouqi Yuan ◽  
Giovanna Cavazzini ◽  
...  
Keyword(s):  
Coherent Structure ◽  
Cavity Growth ◽  
Three Dimensional ◽  
Adverse Pressure Gradient ◽  
Buffer Zone ◽  
Cavitating Flow ◽  
Lagrangian Analysis ◽  
Lagrangian Coherent Structure ◽  
Cavity Development ◽  
Unsteady Cavitating Flow

Abstract This study employs an incompressible homogeneous flow framework with a transport-equation-based cavitation model and shear stress transport turbulence model to successfully reproduce the unsteady cavitating flow around a three-dimensional hydrofoil. Cavity growth, development, and break-off during the periodic shedding process are adequately reproduced and match experimental observations. The predicted shedding frequency is very close to the experimental value of 23 ms. By monitoring the motions of the seeding trackers, growth-up of attached cavity and dynamic evolution of U-type cavity are clearly displayed, which indicating the trackers could serve as an effective tool to visualize the cavitating field. Repelling Lagrangian Coherent Structure (RLCS) is so complex that abundant flow patterns are highlighted, reflecting the intricacy of cavity development. The formation of cloud cavities is clearly characterized by the Attracting Lagrangian Coherent Structure (ALCS), where bumbling wave wrapping the whole shedding cavities indicates the rotating transform of cavities and stretching of the wave eyes shows the distortion of vortices. Generation of the re-entrant jet is considered to be not only associated with the adverse pressure gradient due to the positive attack angle, but also the contribution of cloud cavitating flow, based on the observation of a buffer zone between the attached and cloud cavities.

Effects of Dissolved Gas on Unsteady Cavitating Flow Around a Clark Y-11.7% Hydrofoil

2015 ◽  
Author(s):  
Haruki Daido ◽  
Satoshi Watanabe ◽  
Shin-ichi Tsuda
Keyword(s):  
High Speed ◽  
Cavitating Flow ◽  
Gas Content ◽  
Dissolved Gas ◽  
Drag Forces ◽  
Cavitation Behavior ◽  
Lift And Drag ◽  
Super Cavity ◽  
Unsteady Cavitating Flow ◽  
Low Do

In the present study, the effects of dissolved gas content on the unsteady cavitating flow around a Clark Y-11.7% hydrofoil are investigated in a cavitation tunnel. Lift and drag forces in various cavitating conditions are directly measured by strain gauges attached on the cantilever supporting the hydrofoil. In addition, the cavitating flow is filmed from the top and the side simultaneously using two high speed video cameras. The high (roughly 6–8ppm) and low (1–2ppm) DO conditions are examined to obtain the qualitative tendencies of the effects of dissolved gas on unsteady cavitation behavior and lift/drag characteristics. It is found that that the relationship between the cavitation behavior and the lift/drag fluctuations does not qualitatively differ in the two different DO conditions, while the amplitude is slightly larger in the low DO condition. At transitional cavity oscillation, in the both DO conditions, the lift/drag coefficients increase during the growth stage of sheet/bubble cavities on the hydrofoil and they decrease when the developed super-cavity disappears. Moreover, it seems that the amplitude of the lift/drag forces in the low DO condition is larger than in the high DO condition but the frequency of lift force fluctuation is not very different.

G704 Numerical Simulation of the Unsteady Cavitating Flow in an Inducer for Turbopump(1)

2006 ◽  
Vol 2006 (0) ◽  
pp. _G704-a_
Author(s):  
Hiroki Ugajin ◽  
Masafumi Kawai ◽  
Kohei Okita ◽  
Yoichiro Matsumoto ◽  
Takeo Kajishima ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Cavitating Flow ◽  
Unsteady Cavitating Flow
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