The continuing development of multi-purpose finite element analysis (FEA) codes permits their application to provide new and penetrating insights into the difficult subject of underwater explosive effects and the coupled response of nearby structures. In this paper we investigate the use of one such code (DYNA2D) to model the physical processes associated with an underwater explosion. We compute models covering a range in explosive masses and depths of detonation. The models are shown to simulate much of the important physics of an underwater explosion including: explosive detonation, shock wave generation and transmission, bubble pulsation and the generation of bubble pulse pressure waves. The model results are compared to published experimental data for key features of an underwater explosion such as bubble periods, maximum bubble radii and characteristics of the shock and bubble pressure waves. The good quantitative agreement found for many of these features demonstrates that FEA codes can be used to model important aspects of an underwater explosion. Nevertheless a number of limitations are identified, the most serious of which is the absence of some important energy loss mechanisms associated with bubble collapse.

Hydronamics of Explosion presents the research results for the problems of underwater explosions and contains a detailed analysis of the structure and the parameters of the wave fields generated by explosions of cord and spiral charges, a description of the formation mechanisms for a wide range of cumulative flows at underwater explosions near the free surface, and the relevant mathematical models. Shock-wave transformation in bubbly liquids, shock-wave amplification due to collision and focusing, and the formation of bubble detonation waves in reactive bubbly liquids are studied in detail. Particular emphasis is placed on the investigation of wave processes in cavitating liquids, which incorporates the concepts of the strength of real liquids containing natural microinhomogeneities, the relaxation of tensile stress, and the cavitation fracture of a liquid as the inversion of its two-phase state under impulsive (explosive) loading. The problems are classed among essentially nonlinear processes that occur under shock loading of liquids and may be of interest to researchers in physical acoustics, mechanics of multiphase media, shock-wave processes in condensed media, explosive hydroacoustics, and cumulation.

This book explores the interplay of bubble dynamics and shock waves, covering shock wave emission by laser generated bubbles, pulsating bubbles near boundaries, interaction of shock waves with bubble clouds, applications in shock wave lithotripsy, and more.

This technical report offers important insights into the behavior of underwater explosion bubbles, drawing on extensive research and numerical simulations. Ignace I. Kolodner provides detailed results and analysis of these complex phenomena, offering practical guidance for engineers and scientists working in underwater acoustics and related fields. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

This volume contains description of experimental and numerical results obtained in the UFAST project. The goal of the project was to generate experiment data bank providing unsteady characteristics of the shock boundary layer interaction. The experiments concerned basic-reference cases and the cases with application of flow control devices. Obtained new data bank have been used for the comparison with available simulation techniques, starting from RANS, through URANS, LES and hybrid RANS-LES methods. New understanding of flow physics as well as ability of different numerical methods in the prediction of such unsteady flow phenomena will be discussed.