Large eddy simulation of micro vortex generator-controlled cavitation across multiple stages DOI

Chengqi Mou,

Bangxiang Che, Yuxuan Wang

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(10)

Published: Oct. 1, 2024

Micro vortex generators (mVGs) control cavitation by altering the boundary layer flow structure. This study employs wall-adapting local eddy-viscosity large eddy simulation (WALE-LES) turbulence model combined with Zwart–Gerber–Belamri to conduct transient numerical simulations on National Advisory Committee for Aeronautics 0015 baseline hydrofoil and equipped mVGs under various numbers. The proper orthogonal decomposition method experiments verify accuracy consistency of these regarding cavity scale. elucidates mechanisms which suppress cloud at low numbers induce high Results indicate that maintain sheet characteristics numbers, reducing wall pressure fluctuations enhancing stability. During inception, mVG-induced leads early formation. In phase, modal energy distribution is more dispersed, while in inception concentrated significant dominant modes. Moreover, counter-rotating vortices generated mitigate separation, enhance leading-edge attachment stability, reduce high-frequency vibrations caused bubble shedding. significantly advances understanding accurately simulating revealing across different stages using WALE-LES model. findings demonstrate can effectively stabilize structures instabilities overall performance. These insights will have a impact design hydrofoils development strategies.

Language: Английский

Study of cavitation-induced flow characteristics of a vortex pump based on coherence analysis DOI
Peijian Zhou, Li J, Yanzhao Wu

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(3)

Published: March 1, 2025

Cavitation-induced flow instabilities in vortex pumps critically degrade hydraulic performance and operational lifespan. This study investigates the evolution of vapor cavities within across various cavitation states using both numerical simulations experimental analysis. The unsteady dynamics impeller channel are examined, relationships among pressure pulsations, volume, volume fraction analyzed. As intensifies, expands progressively. Notably, time required for to expand during critical is twice as long that severe cavitation, whereas contraction one-fourth. variation inside follows a distinct pattern, initially increasing then decreasing, with peak occurring cavitation. interactions between fraction, become increasingly complex, especially where amplitude pulsations significantly decreases, increases, fluctuations suppressed. Wavelet coherence analysis reveals coupling these three variables different temporal scales frequency bands, enhanced observed low-frequency range (0–50 Hz). These findings provide valuable insights optimization development municipal industrial fluid transport applications.

Language: Английский

Citations

1
Effect of leakage flow on sediment erosion in guide vane region DOI
Zilong Zhao, Zhongdong Qian, Ole Gunnar Dahlhaug

et al.

International Journal of Mechanical Sciences, Journal Year: 2025, Volume and Issue: unknown, P. 110122 - 110122

Published: March 1, 2025

Language: Английский

Citations

1
An improved Eulerian-Lagrangian method combined with ductile material model for cavitation erosion assessment DOI
Ziyang Wang, Huaiyu Cheng, Xianwu Luo

et al.

Journal of Fluids Engineering, Journal Year: 2024, Volume and Issue: 147(5)

Published: Oct. 29, 2024

Abstract Cavitation erosion in hydraulic machinery constitutes a multifaceted, instantaneous physicochemical process resulting material wear and decreased efficiency. This paper employs an enhanced Eulerian–Lagrangian method to evaluate cavitation erosion. The captures erosive impact loads released by the nonspherical collapse of near-wall bubbles integrates them with one-dimensional ductile mode, capability lacking traditional homogeneous mixture methods. A classic axisymmetric nozzle test case is conducted under four different numbers (σ = 0.8, 0.9, 1.09, 1.6) validate reliability new approach. Qualitative quantitative analysis demonstrates that load distribution on lower upper walls aligns experimental measurements. Compared reference works, accurately predicts maximum position yields narrower area closer data. Moreover, relative error minimum incubation time at σ 0.9 wall calculated 4.67%, rate 36.6%. pivotal for further studying how various materials respond wear. Further reveals response patterns are similar conditions 1.09. In contrast, surface reduced 46.7%, nearly triples 1.6.

Language: Английский

Citations

8
Investigation on the vortex dynamics in the wake of a rotating propeller DOI
Lianzhou Wang, Hao Huang, Chen‐Yu Huang

et al.

International Journal of Mechanical Sciences, Journal Year: 2025, Volume and Issue: 287, P. 109918 - 109918

Published: Jan. 7, 2025

Language: Английский

Citations

0
Unequal splitting phenomenon of cavitation bubbles near rigid boundaries within a narrow gap DOI
Junwei Shen,

Jiaze Ying,

Wenda Liu

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(1)

Published: Jan. 1, 2025

The present work investigates the unequal splitting of cavitation bubbles near rigid boundaries within a narrow gap. Based on high-speed photographic experiments, typical phenomenon bubble is shown, and parametric partitions in proximity to cylinder flat wall are presented. Kelvin impulse theory, underlying physical bubble-splitting mechanisms explored. In addition, impacts main parameters quantitatively analyzed. conclusions as follows. (1) Under different cylinder–bubble distances, splits into three cases: an upper larger part lower smaller part, two equal-sized parts, part. (2) caused by inconsistencies between directions bubble-collapse jet centroid movement. (3) As radius cylinder–wall distance increase, shifts from case 1 3, suggesting effect increases flat-wall decreases.

Language: Английский

Citations

0
Thermal Diffusion Mediated Nucleation of Vapor Bubbles on Metal Microspheres DOI
Chenliang Xia,

Zhibin Hu,

Fulong Wang

et al.

International Journal of Mechanical Sciences, Journal Year: 2025, Volume and Issue: unknown, P. 110099 - 110099

Published: Feb. 1, 2025

Language: Английский

Citations

0
Numerical prediction for cavitation erosion based on a novel Lagrangian particle introducing approach DOI
Ning Qiu,

Yifu Gong,

Han Zhu

et al.

Wear, Journal Year: 2025, Volume and Issue: unknown, P. 206044 - 206044

Published: March 1, 2025

Language: Английский

Citations

0
An experimental study on the effect of air injection around the leading edge of a three-dimensional hydrofoil for cavitation noise reduction DOI
Ali Kareem Hilo,

Young-Jin Kim,

Ji-Woo Hong

et al.

Ocean Engineering, Journal Year: 2025, Volume and Issue: 333, P. 121430 - 121430

Published: May 13, 2025

Language: Английский

Citations

0
Experimental investigation of chocked cavitation flow and its oscillation mechanism in jet pump cavitation reactors under limited operation stage DOI

Tongshan Chai,

Jiong Wang, Huaiyu Cheng

et al.

Experimental Thermal and Fluid Science, Journal Year: 2024, Volume and Issue: unknown, P. 111332 - 111332

Published: Oct. 1, 2024

Language: Английский

Citations

3
Large eddy simulation of micro vortex generator-controlled cavitation across multiple stages DOI

Chengqi Mou,

Bangxiang Che, Yuxuan Wang

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(10)

Published: Oct. 1, 2024

Micro vortex generators (mVGs) control cavitation by altering the boundary layer flow structure. This study employs wall-adapting local eddy-viscosity large eddy simulation (WALE-LES) turbulence model combined with Zwart–Gerber–Belamri to conduct transient numerical simulations on National Advisory Committee for Aeronautics 0015 baseline hydrofoil and equipped mVGs under various numbers. The proper orthogonal decomposition method experiments verify accuracy consistency of these regarding cavity scale. elucidates mechanisms which suppress cloud at low numbers induce high Results indicate that maintain sheet characteristics numbers, reducing wall pressure fluctuations enhancing stability. During inception, mVG-induced leads early formation. In phase, modal energy distribution is more dispersed, while in inception concentrated significant dominant modes. Moreover, counter-rotating vortices generated mitigate separation, enhance leading-edge attachment stability, reduce high-frequency vibrations caused bubble shedding. significantly advances understanding accurately simulating revealing across different stages using WALE-LES model. findings demonstrate can effectively stabilize structures instabilities overall performance. These insights will have a impact design hydrofoils development strategies.

Language: Английский

Citations

2