Numerical research of water jet characteristics in underwater explosion based on compressible multicomponent flows

Yu, Jun; Liu, Jianhu; He, Baorong; Li, Haitao; Xie, Tao; Pei, Du

doi:10.1016/j.oceaneng.2021.110135

Cited by 14 publications

(6 citation statements)

References 26 publications

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“…In this study, the underwater pressure wave propagation is numerically simulated using the 5-equation model [24,25], which is one of the compressible multi-phase fluid models. The 5-equation model is widely used for compressive multiphase flow simulations such as bubble-shock interaction, bubble collapses, and underwater explosions [22,[26][27][28][29][30]. This model can be written as follows:…”

Section: Governing Equationsmentioning

confidence: 99%

“…In this case, we do not apply the term K∇•u due to strong expansion in the meniscus. In some studies simulating an underwater explosion with strong expansion waves, it was reported that the term K∇•u should not be applied for stable computation [27,30].…”

Section: Simulation Settings and Conditionsmentioning

confidence: 99%

“…In this case, we do not apply the term 𝐾𝛻 • 𝒖 due to strong expansion in the meniscus. In some studies simulating an underwater explosion with strong expansion waves, it was reported that the term 𝐾∇ • 𝒖 should not be applied for stable computation [27,30]. Figure 3 shows the simulation settings for a microchannel without the meniscus (w/omeniscus setting) for evaluating impulse.…”

Section: Simulation Settings and Conditionsmentioning

confidence: 99%

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Numerical Investigation on Influence of Number of Bubbles on Laser-Induced Microjet

Ishikawa

Nishida

Tagawa

2022

Water

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In this study, the impact of the number of bubbles on the velocity of laser-induced microjet is numerically investigated, focusing on the pressure wave propagation generated by multiple laser-induced bubbles. First, we show that the microjet velocity increases with the increasing impulse of the pressure wave propagating to the meniscus direction. This result indicates that it is possible to study the structure of the pressure field generated from bubbles to investigate the effect on microjet generation. In addition, it is found that the microjet is weakened with the increase in the number of bubbles. Next, we show that the propagation of the pressure waves has two types. The first type is propagating from a bubble to a meniscus. The second type is propagating round trip between nearby bubbles or by the bubble itself. Finally, we explain the reason for the decrease in the microjet velocity with the increasing number of bubbles by an expansion history of the bubbles, which depends on their interaction with the pressure waves. These results could help to design not only laser-induced microjet generation but also devices that use laser-induced bubbles generated in a microchannel.

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Section: Governing Equationsmentioning

confidence: 99%

Section: Simulation Settings and Conditionsmentioning

confidence: 99%

Section: Simulation Settings and Conditionsmentioning

confidence: 99%

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Numerical Investigation on Influence of Number of Bubbles on Laser-Induced Microjet

Ishikawa

Nishida

Tagawa

2022

Water

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“…Particularly, it is a diffuse-interface method and has advantages over the sharp interface method because it does not require geometric reconstruction, remeshing or special thermodynamic treatments [27]. Therefore, this model has been leveraged for solving several practical problems [28], [29], [30], [31], [32]. The five-equation model can be written as follows:…”

Section: Multiphase Flow Simulationmentioning

confidence: 99%

“…The five-equation model was discretized using the finite volume method. Numerical fluxes are computed using the Harten-Lax-van Leer-contact approximate Riemann solver [28], which is frequently utilized in five-equation modeling [27], [29], [30], [31], [32]. For the reconstruction, we leveraged the third-order monotonic upstream-centered scheme for conservation laws [36] featuring a minmod limiter [37] (MUSCL3) and ρ-THINC [31].…”

Section: Multiphase Flow Simulationmentioning

confidence: 99%

Design Exploration of Initial Bubbles for Higher-Speed Laser-Induced Microjets

2023

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Laser-induced microjets are advantageous for yielding high-speed and convergent microjets shape. However, owing to the need for high-power laser devices, reducing the required laser power is a prerequisite for convenience in practical use. This study aimed to optimize initial multiple bubbles design and find the dominant parameters for efficient microjet generation. For this purpose, the bubble design was optimized using an evolutionary algorithm-the covariance matrix adaptation evolutionary strategy. In addition, the dataset of solutions obtained through the optimization process was analyzed via principal component analysis (PCA). The optimization and analysis revealed that a higher microjet velocity could be obtained when a single bubble was generated near the tube wall, and an optimal total bubble volume was observed corresponding to this optimization. In addition, this approximate optimal solution we obtained was confirmed to reduce 88% of total initial energy compared to that of the typical solution. The result shows possibility to improve the efficiency of microjet generation and reducing the laser power.

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Study on Load Characteristics of Near-Wall Deep-Water Explosion Under Different Condition Parameters

Zhong,

Luo,

Chen

et al. 2024

Mechanisms and Machine Science

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Numerical research of water jet characteristics in underwater explosion based on compressible multicomponent flows

Cited by 14 publications

References 26 publications

Numerical Investigation on Influence of Number of Bubbles on Laser-Induced Microjet

Numerical Investigation on Influence of Number of Bubbles on Laser-Induced Microjet

Design Exploration of Initial Bubbles for Higher-Speed Laser-Induced Microjets

Study on Load Characteristics of Near-Wall Deep-Water Explosion Under Different Condition Parameters

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