【作者】 蔡赢； 刘筠乔； 王本龙；

【Author】 CAI Ying;LIU Yun-qiao;WANG Ben-long;Department of Engineering Mechanics,Shanghai Jiao Tong University;

【机构】 上海交通大学工程力学系；

【摘要】 旋涡流场中的气泡动力学行为与梢涡空化的初生问题、水翼云空化区的流动特征密切相关。采用粒子追踪法(Particle Tracking Method,PTM)可快速求解气泡在旋涡流场中的运动轨迹。然而,由于PTM方法通常不考虑气泡的非球状变形,因此无法体现表面张力对于气泡轨迹的影响。为此引入等效Eo数,对几种拖曳力系数的拟合效果进行比较,以直接数值模拟(DNS)结果为基准,初步分析了几种拖曳力修正方法的有效性和局限性。更多还原

【Abstract】 The bubble dynamics in vortex flow field is closely related to the primary problem of tip vortex cavitation and the flow characteristics of hydrofoil cloud cavitation region.Particle Tracking Method(PTM) can be used to quickly solve the trajectory of bubbles in the vortex flow field.However,the influence of surface tension on the trajectory of bubbles cannot be reflected because the PTM method usually does not consider the non-spherical deformation of bubbles.To this end,the equivalent Eo number is introduced to compare the fitting effects of several drag force coefficients.Based on the direct numerical simulation(DNS) results,the effectiveness and limitations of several correction methods for drag force are preliminarily analyzed.更多还原