The motion of a 3D toroidal bubble and its interaction with a free surface near an inclined boundary
The motion of a 3D toroidal bubble and its interaction with a free surface near an inclined boundary
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3D 环形气泡的运动及其与倾斜边界附近的自由表面的相互作用
DOI：
10.1063/1.4972771
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发表时间：
2016
影响因子：
4.6
通讯作者：
Zhang A. M.
中科院分区：
文献类型：
--
作者：
Liu Y. L.;Wang Q. X.;Wang S. P.;Zhang A. M.
三维环形气泡动力学的数值模拟是一个具有挑战性的问题，由于复杂的拓扑过渡的流域，物理和数值的不稳定性，与射流穿透气泡。在本文中，这种现象是模拟使用边界积分法（BIM）耦合涡环模型。我们实现了一个新的影响模型，包括细化的本地网格附近的影响位置之前和之后的影响，并在一个高分辨率的手术切割形成一个光滑的孔从单连接到双连接形式的过渡。这使得能够实现从单连接气泡到环形气泡的平滑过渡。由涡环引起的势被简化为沿涡环沿着的线积分。本文提出了一种新的网格密度控制技术，用于更新气泡和自由表面，该技术根据表面的曲率分布来控制网格密度，从而提高了表面的网格质量。新闻中心
The numerical modelling of 3D toroidal bubble dynamics is a challenging problem due to the complex topological transition of the flow domain, and physical and numerical instabilities, associated with jet penetration through the bubble. In this paper, this phenomenon is modelled using the boundary integral method (BIM) coupled with a vortex ring model. We implement a new impact model consisting of the refined local mesh near the impact location immediately before and after impact, and a surgical cut at a high resolution forming a smooth hole for the transition from a singly connected to doubly connected form. This enables a smooth transition from a singly connected bubble to a toroidal bubble. The potential due to a vortex ring is reduced to the line integral along the vortex ring. A new mesh density control technique is described to update the bubble and free surfaces, which provides a high mesh quality of the surfaces with the mesh density in terms of the curvature distribution of the surface. The pressu...