Three-dimensional vertical free high-speed water-entry impact of rigid sphere

被引：0
|
作者：
Sun Y. [1 ]
Zhou S. [1 ]
Zhang X. [1 ]
Sun Y. [1 ]
机构：
[1] Academy of Weaponry Engineering, Naval University of Engineering, Wuhan, 430033, Hubei
[2] Unit No.91267, Fuzhou, 350000, Fujian
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2019年 / 39卷 / 06期
关键词：
Impact; Microboundary motion equivalent method; Rigid sphere; Theory of fluid elasticity; Three-dimensional water-entry;
D O I：
10.11883/bzycj-2018-0094
中图分类号：
学科分类号：
摘要：
At the initial stage of water entry, the water surrounding of the rigid sphere will show strong nonlinear characteristics. However, there are no exact three-dimensional effects in impact problem within the Wagner theory. Based on the non-viscous incompressible flow model, this paper considered fluid elasticity, used the micro boundary motion equivalent method to analyze the moving boundary, and based on the theory of energy conservation, which considered the loss of kinetic energy, analyzed the three-dimensional flow of the fluid around the rigid sphere during high-speed water-entry vertically, then established the analytical model which can calculate the water-entry impact of rigid sphere, and the analytical model is verified by an FEM model of multi-material ALE method. Base on the analytical model, this paper also analyzed the influencing factors of impact. The analytical model provides a fast algorithm for calculating the high-speed water-entry impact of structure, and has certain theoretical significance and engineering application value. © 2019, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.
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