Spatial-temporal evolution mechanism of underwater salvo of two slender bodies based on three degrees of freedom model

作     者：Zhang, Lei Gu, Longming Kong, Xiangshao Wang, Shan Pei, Zhiyong 

作者机构：Wuhan Univ Technol Sanya Sci & Educ Innovat Pk Sanya 572000 Hainan Peoples R China Wuhan Univ Technol Green & Smart River Sea Going Ship Cruise & Yacht Wuhan 430063 Hubei Peoples R China Univ Lisbon Ctr Marine Technol & Engn CENTEC Inst Super Ten Lisbon Portugal Wuhan Univ Technol Sch Naval Architecture Ocean & Energy Power Engn Wuhan 430063 Hubei Peoples R China 

出 版 物：《OCEAN ENGINEERING》 (Ocean Eng.)

年 卷 期：2025年第317卷

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 0824[工学-船舶与海洋工程] 0814[工学-土木工程] 

基　　金：Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City [202 1JJLH0035] National Natural Science Foundation of China Fundamental Research Funds for the Central Universities [WUT: 223173001] 

主　　题：Underwater salvo Cavitation phenomenon Three-degrees-of-freedom motion Fluid-structure interaction Spatial-temporal evolution 

摘      要：Although the underwater salvo is more efficient than the single launch, the flow-mediated interaction between slender bodies makes the launch more complicated. To address the highly nonlinearity in fluid-structure interactions and the coupling motions of structures, a numerical method is proposed for analyzing the underwater salvo of two slender bodies under transverse flow. The three-degree-of-freedom (3-DOF) motion model of structures, combined with the cavitation and collision models, is adopted. The model is initially validated and verified through a comparison with the experimental results. Subsequently, the applicability of the model in flows is analyzed, and the effects of the launch time interval (zt) and spatial interval (zs) on the salvo are discussed. The findings demonstrate the effectiveness of proposed model, particularly in high-speed transverse flow and the strong flow-mediated interaction. When z t and z s are large, the slender bodies are mainly affected by the transverse flow, reducing success of salvo due to the collision between the bodies and their barrels. It is recommended that z t = 0 with z s = 2D (diameter of slender bodies) be employed to achieve both efficiency and success in the salvo. The peak pressures within the barrels especially when z t =0 should also be considered in the structural design.