气泡群在液体中上升时，由于气泡之间的互相作用，会出现追赶、排斥、融合或者碰撞的现象，呈现出与单气泡上升时完全不同的运动形式。另外在托克马克装置中，用于强化换热的气泡群将受到磁场的影响，其流动特性将显著改变，这会影响能量转换部件的换热特性。已有的研究主要集中于气泡上升的Reynolds数(Re)、Weber数(We)以及气泡群的数目对其相互作用的影响，机理性认识不够深入。本项目旨在通过直接数值模拟的方法来展示双气泡以及气泡群上升时的相互作用和流场特性，耦合考虑黏性、惯性、表面张力和电磁力的影响，采用自适应网格技术(Adaptive Mesh Refinement, AMR)来精确捕捉两相界面和流场结构，深入揭示气泡形变和尾涡结构对气泡间相互作用的影响，并从物理机理上深入探讨其内在原因。随后我们将研究在不同的磁场方向和大小时，气泡群的运动特性以及换热特性，为工业生产应用提供理论指导。

When buoyancy-driven bubbles are rising in liquids, some special flow characteristics, such as bubble catching, bubble repelling, bubble coalescing or bubble bouncing will be observed due to the interactions between bubbles， which is very different from the case of single bubble rising, since the hydrodynamic field about a bubble moving close to other bubbles is modified by the presents of its neighbors. Moreover, in the Tokomak fusion device, where bubbly flows are employed for enhancement of heat transfer, the flow characteristics will be greatly influenced by magnetic field. Concerning this topic, the influence of the Reynolds (Re) number, the approaching Weber (We) number and the amounts of bubbles are enormously studied in the available publications, but the essential mechanics are merely involved. However, the present research will focus on studying the significance of bubble deformation, wake structure in interactions between two bubbles and bubbly flowsthrough direct numerical simulations, where viscosity, inertial, surface tension and electromagnetic force are all accounted for. The adaptive mesh refinement (AMR) technique will be employed to capture the bubble interfaces as well as the wake structures, in order to study the role they play when the bubbles interact. Moreover, we will further analyze the physical mechanics hiding behind the interaction phenomena by presenting the distribution of the flow field. Furthermore, the influence of the magnetic field on the bubbly behaviors, as well as the heat transfer efficiency, will be studied through changing the magnetic directions and strengths. The induced electromagnetic field, together with the bubble deformations and wake structures will be presented to study the physical mechanics of the magnetic influence, which will provide a theoretic guide for the industrial production.