Study on the ditching of space capsules using the smoothed particle hydrodynamics method

Ju, Xin-Yang; Sun, Peng-Nan; Shen, Yan-Ming; Chen, Jianqiang; Zhang, A-Man

doi:10.1016/j.oceaneng.2023.114714

Cited by 7 publications

(1 citation statement)

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“…The water-entry problem exists in many engineering fields, such as water entry of vehicles, the airdrop of aircraft, the water landing of seaplanes and spacecraft and the wave slamming of ships, etc. (Seddon & Moatamedi 2006;Fang et al 2022;Ju et al 2023;Kong et al 2023;Sun et al 2023;Zhao, Yang & Ming 2023a). High-speed water entry is a transient and strongly nonlinear process involving crossing air and water interfaces, and many complex flows, such as violent water surface splashing and various characteristics of cavity evolution, always occur; these flows are strongly related to the strong impact loads and drastic motions of the body entering the water (Truscott, Epps & Belden 2014;Shi, Hua & Pan 2020;Sui et al 2023).…”

Section: Introductionmentioning

confidence: 99%

Investigation of free surface effect on the cavity expansion and contraction in high-speed water entry

Liu,

Ming

et al. 2024

J. Fluid Mech.

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The evolution of the water-entry cavity affects the impact load and the motion of the body. This paper adopts the Eulerian finite element method for multiphase flow for simulations of the high-speed water-entry process. The accuracy and convergence of the numerical method are verified by comparing it with the experimental data and the results of the transient cavity dynamics theory. Based on the results, the representative characteristics of the cavity are discussed from the perspective of the cavity cross-section. It is found that the asymmetry of the cavity expansion and contraction durations is related to the motion of the free surface and the closure of the cavity. The uplift of the free surface suppresses cavity expansion, while the jet generated from free surface closure accelerates cavity contraction. The duration of the contraction of the cavity near the free surface is shorter than the expansion duration due to the change in the velocity distribution caused by the free surface motion. The necking phenomenon during deep closure leads to an increase in the internal pressure of the cavity, prolonging cavity contraction near the deep closure area. This work provides new insights into the cavity dynamics in high-speed water entry.

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