中文摘要：

移动粒子半隐式（MPS）方法捕捉多相流体动力学相界面的能力比传统网格方法具有明显优势。本研究采用MPS方法,使用FORTRAN语言自编程序,对单个氩气气泡在液态铅铋合金内从静止到充分发展整个过程中的瞬态动力学行为进行二维数值模拟,得到气泡变形特性与上升速度的关系。结果表明：在气泡上升过程中,气泡由球形先变成酒窝形状,最后成为球冠形状。数值模拟得到的气泡上升终极速度与Grace预测结果符合较好,随着气泡初始直径的增大气泡上升终极速度增大。

英文摘要：

Moving Particle Semi-Implicit（MPS） Method has advantages over the traditional mesh-based methods in the accurate capture of the vapor-liquid interface.In the present study,the numerical simulation of single bubble rising behavior in the liquid Pb-Bi alloy had been performed.The numerical results are provided for bubble shape deformation and rising velocity.Numerical simulation results indicate that as the bubble rises,the bubble exhibits in turn spherical,dimpled ellipsoidal,spherical-cap shapes.Terminal velocity of the bubble predicted by MPS agrees well with that predicted by Grace and increases with the initial bubble diameter.