Comparison of High-Speed Water Entry Movement Process of Axisymmetric Bodies with Different Head Shapes

• Published in: 水下无人系统学报 Vol. 32; no. 3; pp. 451 - 462
• Main Authors: Yu WANG, Yongliang XIONG, Xuanhui TIAN, Fuchang ZHOU, Ao LIU, Guocang SUN
• Format: Journal Article
• Language: Chinese
• Published: Science Press (China) 01.06.2024
• Subjects: cavity; multiphase flow; trans-medium axisymmetric body; water entry
• ISSN: 2096-3920
• DOI: 10.11993/j.issn.2096-3920.2024-0028

High-speed water entry of the trans-medium axisymmetric body is an instantaneous flow process, involving the complex multiphase flow of the axisymmetric body with the gas and liquid phases. In this paper, a numerical model of cavity dynamics after water entry was established based on Reynolds-averaged Navier-Stokes equations and a multiphase flow model of natural cavitation. The movement characteristics and hydrodynamic force effects of axisymmetric bodies with different head shapes during vertical water entry were studied. The effectiveness of the model and the numerical method was verified by comparing the numerical simulation results with the experimental results in related literature. The results show that the cavity characteristics and the movement speed laws of axisymmetric bodies with different head shapes after water entry are highly different. The corresponding transient drag coefficients also show great differences. The re-entrant jet effect is evident before the cavity is closed, and it affects the