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arXiv 2401.06004physics.flu-dyn
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气枪气泡产生的压力波:基于有限体积法的数值分析

Pressure waves from air gun bubbles: a numerical analysis based on Finite Volume Method

Shi-Ping Wang, Hang Geng, Shuai Zhang, Si-Wei Wang

AI总结:

本文通过基于VOF与FVM的数值模拟研究气枪气泡压力波,揭示远场压力与气体膨胀加速度成正比,并发现气枪开口和腔室长径比通过影响气体释放速度显著改变首个压力峰值。

摘要:

气枪发射的压力波包含多种频率,其中低频波有利于勘探和成像,而高频波因对海洋生物有害需要加以抑制。高频波源于空气释放过程中气流的快速振荡,例如气体射流冲击液体、气枪气泡的膨胀以及气枪本体与气泡之间的相互作用。然而,这些动力学过程及其发射的波可以通过气枪的特殊设计进行调节。为分析其内在关系,我们提出了一项基于可压缩气枪气泡模型的数值研究,采用流体体积(VOF)方法结合有限体积法(FVM),并在STAR-CCM+中实现。研究了气枪的排气过程,以揭示气枪本体的影响。结果表明,远场气枪压力主要与整体气体的膨胀加速度成正比。我们的结果还表明,气枪的开口和腔室形状会影响气体膨胀加速度,从而显著影响压力波的第一个峰值。开口越大,气体释放越快,第一个峰值的幅度越大;腔室长径比越大,气体释放越慢,第一个峰值的幅度越低。

英文摘要:

The pressure wave emitted from the air gun contains many frequencies, among which the low-frequency waves are desirable for exploration and imaging, while the high-frequency waves need to be suppressed as they are harmful to marine species. The high-frequency waves originate from the fast oscillations of the flow during the release of the air, such as the impingement of the gas jet into the liquid, the expansion of the air gun bubble, and the interaction between the air gun body and the bubble. However, those dynamic and the emitted waves are adjustable by the special design of the air guns. To analyze the underlying relations, we present a numerical study with a compressible air gun bubble model using the volume of fluid (VOF) approach combined with the finite volume method (FVM) implemented in STAR-CCM+. The venting process of an air gun is investigated to reveal the influence of the air gun body. The results show that air gun pressure for the far field is mainly proportional to the expansion acceleration of the whole gas. Our results also indicate that the opening and chamber shape of the air gun affects the gas expansion acceleration, which influences the first peak of the pressure wave significantly. The larger the opening is, the faster the gas is released, the greater the amplitude of the first peak is. The larger the chamber length/diameter ratio, the slower the gas is released and the lower the amplitude of the first peak.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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