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Research on impact pressures in aerated water entry of a symmetrical wedge

Published online by Cambridge University Press:  29 April 2025

Wencheng Wu Open the ORCID record for Wencheng Wu [Opens in a new window] ,
Longfei Xiao Open the ORCID record for Longfei Xiao [Opens in a new window] ,
Yufeng Kou  and
Mingyue Liu
Wencheng Wu
Affiliation:
State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China
Longfei Xiao*
Affiliation:
State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China SJTU-Sanya Yazhou Bay Institute of Deepsea Science and Technology, Sanya 572024, PR China
Yufeng Kou
Affiliation:
State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China
Mingyue Liu
Affiliation:
State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China SJTU-Sanya Yazhou Bay Institute of Deepsea Science and Technology, Sanya 572024, PR China
*
Corresponding author: Longfei Xiao, [email protected]
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Abstract

In marine and offshore engineering, the presence of air in the water plays a significant role in influencing impact pressures during water entry events. Owing to limited research on the impact loads of aerated water entry, this study aims to explore the effect of aeration on water entry impact pressures. A comprehensive experimental investigation on pure and aerated water entry of a wedge with a 20° deadrise angle was presented. The wire-mesh sensor (WMS) technology was proposed to accurately quantify the spatial and temporal distributions of void fractions in multiphase environments. The WMS provides reliable and consistent measurements at varying void fractions, as validated against image-based methods. The results indicated that the aeration reduced peak impact pressures by up to 33 %, and extended pressure duration, with a linear relationship between impact pressure and void fraction. Furthermore, the probability distribution of peak pressures conformed well to both the generalised extreme value and Weibull distributions, with the void fraction exerting a strong influence on pressure distribution parameters. These findings suggest that controlled aeration can effectively mitigate impact loads, offering practical implications for marine structure design.

JFM classification

Aerodynamics: Flow-structure interactions Aerodynamics: High-speed flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 1010 , 10 May 2025 , A4
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Copyright
© The Author(s), 2025. Published by Cambridge University Press

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