聚焦飞秒脉冲激光对水下微激波与微气泡相互作用的数值模拟研究

Ayumu Yamamoto, Kazuteru Toh, Masaaki Tamagawa
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引用次数: 0

摘要

本研究的目的是阐明在微气泡产生条件下激光诱导微激波的传播机制。本文采用计算流体力学方法研究了微气泡对激光诱导微激波传播的影响。首先,计算一维模型和一维球对称模型,比较冲击波峰值压力随传播的变化规律;对于激波传播的控制方程,采用了连续性方程、欧拉动量方程和泰特状态方程。计算结果表明,一维球对称模型的压力衰减要早于一维模型。此外,一维球对称模型的衰减与激光诱导激波的实验结果一致。然而,冲击波的峰值压力和持续时间与实验结果不一致。然后,将气泡行为纳入激波传播计算。气泡行为采用Rayleigh-Plesset方程。通过计算得到了将激波压力叠加在气泡内压上的压力波。虽然压力波的持续时间与实验结果接近,但压力值与大气压力值基本一致。提出了利用飞秒脉冲激光聚焦产生激波时,除气泡外还可能产生等离子体等现象的可能性
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Simulation to Investigate Interactions of Generated Underwater Micro Shock Waves and Micro Bubbles by Focusing Femtosecond Pulse Laser
The purpose of this study is to elucidate the mechanism of propagation of the laser-induced micro shock waves under condition where the micro bubbles are generated. In this paper, effects of generated micro bubbles on propagation of the laser-induced micro shock waves were investigated by CFD (computational fluid dynamics). Firstly, the two models (1-D model and 1-D spherical symmetric model) were computed for comparison of the peak pressure variation of the shock waves with propagation. As for governing equations for the propagation of the shock waves, continuity equation, Euler’s momentum equation and Tait’s state equation are used. From the computation, it is confirmed that attenuation of pressure of the 1-D spherical symmetric model was earlier than the 1-D model. In addition, the attenuation of the 1-D spherical symmetric model agreed with the laser-induced shock waves obtained experimentally. However, the peak pressure and duration time of the shock wave was not the same as the experimental result. Then, the bubble behavior was included in the computation of the shock wave propagation. As for the bubble behavior, Rayleigh-Plesset equation is used. From this computation, pressure wave was obtained which superposed the pressure of the shock wave on the internal pressure of the bubble. Although the duration time of the pressure wave was close to the experimental result, the value of the pressure was almost the same as atmospheric pressure. It is suggested that there is a possibility that phenomenon other than the bubbles is generated such as plasma when the shock wave is generated by focusing the femtosecond pulse laser
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