3D Impact and Toroidal Bubbles
3D Impact and Toroidal Bubbles
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DOI：
10.1006/jcph.2000.6658
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发表时间：
2001-01
影响因子：
4.1
通讯作者：
Y. L. Zhang;K. S. Yeo;B. Khoo;C. Wang
中科院分区：
文献类型：
--
作者：
Y. L. Zhang;K. S. Yeo;B. Khoo;C. Wang
本文建立了含射流形成和碰撞的三维气泡溃灭模型。强烈的不稳定性的喷射过程中，影响，和环形气泡反弹的阻尼由一个新的平滑计划的基础上最小二乘法，从而使一个平滑的过渡从一个单一的连接气泡到一个双重连接的环形气泡。一个高秩序的网格规则性保持了网格细化过程。本文推广了Q。X. Wang等人（Comput. Fluids25，607（1996））。虽然我们的研究结果表明，从以前的轴对称结果的影响时间和不断发展的环形气泡轮廓的精细功能方面的一些差异，基本的物理与射流的影响，如环周围的环流和环形气泡的反弹，以及捕获在新的模型。我们还提出，第一次，结果完全三维的气泡中的浮力效应导致倾斜喷射。
Abstract A three-dimensional model of collapsing bubble with jet formation and impact is presented in this paper. The strong instabilities of the jetting process, impact, and toroidal bubble rebound are dampened by a new smoothing scheme based on least squares, thus enabling a smooth transition from a singly connected bubble to a doubly connected toroidal bubble. A high order of mesh regularity is maintained by a mesh refinement procedure. The circulation of the flow around the gaseous tube of the toroidal bubble is modelled by a generalization of the vortex ring method of Q. X. Wang et al. (Comput. Fluids25, 607 (1996)). Although our results indicate some differences from previous axisymmetric results in terms of time to impact and fine features of the evolving toroidal bubble profiles, the essential physics associated with the jet impact, such as the circulation around the torus and the rebound of the toroidal bubble, are well captured in the new model. We also present, for the first time, results for fully three-dimensional bubbles in which buoyancy effects lead to oblique jetting.