单个气泡静水中上升特性的数值模拟

摘要

为了研究静水中气泡运动的水力学特性,验证数值模拟方法对气泡运动模拟的有效性和准确性,采用基于流体体积法(VOF法)的几何重构技术捕捉水气两相界面,通过自编后处理程序提取模拟结果数据,获得气泡运动的速度、上升轨迹、变形等参数.模拟结果与模型试验结果比较表明:二者吻合情况良好,说明VOF法能准确地捕捉到气泡界面的变形情况,是一个强大的捕捉两相交界面的工具.随后分析了气泡的变形机理、运动轨迹与瞬时速度变化规律,旨在为相关气泡运动特性研究提供参考.%fn order to study bubble hydrodynamic characteristics in stilt water and validate the accuracy of the numerical simulation method, the Geometric Reconstruction Method of volume-of-fluid(VOF)was employed to track the interface between gas and liquid, and parameters such as bubble deformation, trajectory and speed were processed by digital image processing technology. Simulation results were compared with the model experimental results and found they agreed well with each other. The work showd that VOF method could accurately capture the deformation of the bubble, VOF method was a powerful tool to capture the two intersect interface. The deformation mechanism, trajectory and instantaneous velocity variation were investigated to provide reference for relevant studies on hydrodynamic characteristics of the bubble.