Numerical investigation of an underwater explosion bubble based on FVM and VOF
Numerical investigation of an underwater explosion bubble based on FVM and VOF
复制标题
基于FVM和VOF的水下爆炸气泡数值研究
DOI：
10.1016/j.apor.2018.02.024
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发表时间：
2018-05-01
影响因子：
4.3
通讯作者：
Zhang, A-Man
中科院分区：
文献类型：
--
作者：
Li, Tong;Wang, Shiping;Zhang, A-Man
在本文中，使用可压缩的两相流量求解器在本文中研究了自由场中水下爆炸（UNDEX）气泡的动力学。采用有限体积方法（FVM）用于离散Navier-Stokes方程。流体（VOF）方法的体积用于捕获气泡 - 水界面。针对球形气泡的吉尔莫尔模型进行了验证，并针对受浮力的非球体UNDEX气泡进行了实验。可以很好地预测气泡膨胀，塌陷，高速液体射流和反弹。同时，可以清楚地捕获传播压力波。详细描述了气泡内外的压力和速度场。对于受强大浮力效应的UNDEX气泡，射流在小区域而不是单点的相对侧影响。可以在喷射冲击区域观察到一些微小的气泡。随后，环形气泡会经历分裂和结合。另外，在气泡寿命中几乎可以观察到气泡中气体速度的不均匀分布，而气泡内部的压力场很均匀。最后，仔细研究了气泡在浮力作用下的射流动力学以及气泡的迁移行为。 （c）2018 Elsevier Ltd.保留所有权利。
Dynamics of the underwater explosion (UNDEX) bubble in a free field is numerically investigated in the present paper using a compressible two-phase flow solver. The finite volume method (FVM) is adopted for discretization of the Navier-Stokes equations. The volume of fluid (VOF) method is utilized to capture the bubble-water interface. Validation is carried out against the Gilmore model for a spherical bubble and an experiment for the aspherical UNDEX bubble subjected to buoyancy. The bubble expansion, collapse, high-speed liquid jet and the rebounding are well predicted. Meanwhile, the propagating pressure waves can be clearly captured. The pressure and velocity fields within and surrounding the bubble are described in detail. For the UNDEX bubble subjected to strong buoyancy effect, the jet impacts on the opposite side in a small region rather than at a single point. Splitting of some tiny bubbles can be observed in the jet impact area. The toroidal bubble undergoes splitting and coalescence subsequently. Additionally, non-uniform distribution of the velocity of the gas in the bubble could be observed almost in the entire bubble life while the pressure field inside the bubble is quite uniform. Lastly, the jet dynamics as well as the migrating behaviors of the bubble under the effect of buoyancy is carefully investigated. (C) 2018 Elsevier Ltd. All rights reserved.