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Dynamic Response of Floating Body Subjected to Underwater Explosion Bubble and Generated Waves with 2D Numerical Model

Zhaoli Tian1,2, Yunlong Liu1,2,*, Shiping Wang1, A Man Zhang1, Youwei Kang3
College of Shipbuilding Engineering, Harbin Engineering University, Harbin, Heilongjiang, China.
Division of Applied Mathematics, Brown University, Providence RI 02912, USA.
CIMC Offshore Co. Ltd., Yantai, Shandong, China.
* Corresponding Author: Yunlong Liu. Email: .

Computer Modeling in Engineering & Sciences 2019, 118(2), 397-423. https://doi.org/10.31614/cmes.2019.04419

Abstract

The low frequency load of an underwater explosion bubble and the generated waves can cause significant rigid motion of a ship that threaten its stability. In order to study the fluid-structure interaction qualitatively, a two-dimensional underwater explosion bubble dynamics model, based on the potential flow theory, is established with a double-vortex model for the doubly connected bubble dynamics simulation, and the bubble shows similar dynamics to that in 3-dimensional domain. A fully nonlinear fluid-structure interaction model is established considering the rigid motion of the floating body using the mode-decomposition method. Convergence test of the model is implemented by simulating the free rolling motion of a floating body in still water. Through the simulation of the interaction of the underwater explosion bubble, the generated waves and the floating body based on the presented model, the influences of the buoyancy parameter and the distance parameter are discussed. It is found that the impact loads on floating body caused by underwater explosion bubble near the free surface can be divided into 3 components: bubble pulsation, jet impact, and slamming load of the generated waves, and the intensity of each component changes nonlinearly with the buoyance parameter. The bubble pulsation load decays with the increase in the horizontal distance. However, the impact load from the generated waves is not monotonous to distance. It increases with the distance within a particular distance threshold, but decays thereafter.

Keywords

Underwater explosion, bubble dynamics, fluid-structure interaction, double-vortex model, waves generated by underwater explosion.

Cite This Article

Tian, Z., Liu, Y., Wang, S., Zhang, A. M., Kang, Y. (2019). Dynamic Response of Floating Body Subjected to Underwater Explosion Bubble and Generated Waves with 2D Numerical Model. CMES-Computer Modeling in Engineering & Sciences, 118(2), 397–423.



This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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