Effect of Gas-Liquid Interface Capturing in UNDEX Numerical Simulation

LIU Qi; YANG Yuchen; ZHOU Zhangtao; CHU Dongyang

doi:10.7643/ issn.1672-9242.2025.11.011

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (11) : 104-112. DOI: 10.7643/ issn.1672-9242.2025.11.011

Ships and Marine Engineering Equipment

Effect of Gas-Liquid Interface Capturing in UNDEX Numerical Simulation

LIU Qi^1,2, YANG Yuchen^1,2, ZHOU Zhangtao^1,2,3, CHU Dongyang^1,2,3

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Abstract

The work aims to study the underwater explosion (UNDEX) phenomena to enhance the damage and defense capabilities of future underwater equipment. A numerical simulation method for UNDEX was established, which employed the Finite Volume Method (FVM) to solve the inviscid multiphase Euler equations coupled with the Volume of Fluid (VOF) approach. As long as deviation between the empirical values in bubble radius and pulsation cycles was less than 5%, the method could accurately reproduce shock wave propagation dynamics. UNDEX cases with varying mesh densities, charge shapes, and water depths were calculated. The mesh requirements for large-depth explosion problems were determined, and the parameter effects on the VOF method's gas-liquid interface capture capability were analyzed. In conclusion, under large-depth conditions, the accuracy of the VOF-captured gas-liquid interface exhibits strong dependence on the initial charge geometry. The captured gas-liquid interface exhibits significant dissipation during the contraction phase of the second bubble cycle, which affects subsequent calculations. The capture effect of the gas-liquid interface gradually improves as the water depth decreases. Under the conditions of this paper, the captured overall shape of the bubble still has practical significance up to the third bubble cycle when the water depth is reduced to 200 meters.

Key words

underwater explosion / compressible multiphase flow / VOF method / bubble pulsation / gas-liquid interfaces capturing / FVM

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LIU Qi, YANG Yuchen, ZHOU Zhangtao, CHU Dongyang. Effect of Gas-Liquid Interface Capturing in UNDEX Numerical Simulation[J]. Equipment Environmental Engineering. 2025, 22(11): 104-112 https://doi.org/10.7643/ issn.1672-9242.2025.11.011

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