A computational parameter study for the three-dimensional shock–bubble interaction
A computational parameter study for the three-dimensional shock–bubble interaction
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DOI：
10.1017/s0022112007008749
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发表时间：
2007-12
影响因子：
3.7
通讯作者：
J. Niederhaus;J. Greenough;J. Oakley;Devesh Ranjan;M. Anderson;R. Bonazza
中科院分区：
文献类型：
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作者：
J. Niederhaus;J. Greenough;J. Oakley;Devesh Ranjan;M. Anderson;R. Bonazza
采用一系列三维多流体欧拉数值模拟方法，研究了气体环境中激波-气泡相互作用引起的多流体可压缩流动的形态和时间相关积分性质。气泡由半径为2.54 cm（128个网格点）的球形气体体积组成，该体积由平面冲击波加速。考虑了14种情况：四个气体配对，包括阿特伍德数−0.8 0.2，三维（非轴对称）的影响变得特别显着的总拟能在后期。提出了一种新的总速度环流模型，也来自一维气体动力学的基础上的属性，它比较有利的计算得到的循环数据，相对于现有的模型。非线性声学效应以及初级和次级涡量产生的作用在密度和涡量场的顺序可视化中描述，这表明次级涡量产生和湍流效应的重要性，特别是对于M > 2和A > 0.2。电影可与在线版本的文件。
The morphology and time-dependent integral properties of the multifluid compressible flow resulting from the shock–bubble interaction in a gas environment are investigated using a series of three-dimensional multifluid-Eulerian simulations. The bubble consists of a spherical gas volume of radius 2.54 cm (128 grid points), which is accelerated by a planar shock wave. Fourteen scenarios are considered: four gas pairings, including Atwood numbers −0.8 0.2, three-dimensional (non-axisymmetric) effects become particularly significant in the total enstrophy at late times. A new model for the total velocity circulation is proposed, also based on properties derived from one-dimensional gasdynamics, which compares favourably with circulation data obtained from calculations, relative to existing models. The action of nonlinear-acoustic effects and primary and secondary vorticity production is depicted in sequenced visualizations of the density and vorticity fields, which indicate the significance of both secondary vorticity generation and turbulent effects, particularly for M > 2 and A > 0.2. Movies are available with the online version of the paper.