A numerical research on the interaction between underwater explosion bubble and deformable structure using CEL technique

Keywords: UNDEX bubble, Fluid-structure interaction, CEL technique, finite element method, Water jet

Abstract

The dynamic process of an underwater explosion (UNDEX) bubble in the vicinity of deformable structures is a complex phenomenon that has been studied by many researchers. The dynamic process of a UNDEX bubble is a complex transient problem that results in a highly distorted bubble and large deformation of the structure. The previous work has introduced various solutions for studying the interaction between the UNDEX bubble and deformable structure. The interaction between the bubble and nearby structures has been widely solved by the combination of the boundary element method (BEM) and the finite element method (FEM). However, this couple requires tight time-step controlling, long-time analysis, and large computer resources. Furthermore, this combination is not widely used as the FEM code in commercially available software for solving UNDEX bubble problems. This paper presents a coupled Eulerian-Lagrangian (CEL) approach in commercial software to deal with the fluid-structure interaction (FSI). The numerical model of a UNDEX bubble is first developed and verified by comparing results with experimental, BEM, and empirical data. Then both bubble behavior and structural deformation are examined in various case studies. The numerical results show that the stiffness of the structure has strongly influenced the bubble behavior and the water jet development. The pressure pulse becomes significantly large as the bubble collapse. Besides, this numerical approach also can reproduce crucial phenomena of a UNDEX bubble, such as the whipping effect and water jet attacks. Although the numerical model is developed using simplified boundary conditions, the proposed approach shows the feasibility of simulating the important features of a UNDEX bubble process as well as the response of nearby structures.

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Author Biography

Anh-Tu Nguyen, Hanoi University of Industry

Faculty of Mechanical Engineering

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A numerical research on the interaction between underwater explosion bubble and deformable structure using CEL technique

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Published
2023-01-19
How to Cite
Nguyen, A.-T. (2023). A numerical research on the interaction between underwater explosion bubble and deformable structure using CEL technique. EUREKA: Physics and Engineering, (1), 134-151. https://doi.org/10.21303/2461-4262.2023.002637
Section
Engineering