【作者】 程鹏鑫； 桂南； 杨星团； 屠基元； 姜胜耀；

【Author】 CHENG Peng-xin;GUI Nan;YANG Xing-tuan;TU Ji-yuan;JIANG Sheng-yao;Institute of Nuclear and New Energy Technology,Tsinghua University;

【机构】 清华大学核能与新能源技术研究院；

【摘要】 气-液两相流广泛存在于石油化工、食品加工、生物制药等领域,其中气相通常以气泡的形式分散在液相中。气泡聚并过程由于气泡界面的变化及气泡震荡变形,流场及涡场变化较为复杂。本文使用多相格子玻尔兹曼方法对三维气泡的聚合过程进行了模拟,并使用Liutex方法及其他涡识别方法对聚合过程中的涡变量的变化进行了分析,结果呈现了Liutex三维的空间矢量分布,并对聚合过程中Rm,Sm,Q,Rx,Ry,Rz的极值变化进行了分析,结果表明在聚合时刻涡变量达到极值,Liutex能够准确地捕捉和识别旋转涡的强度与方向。更多还原

【Abstract】 Gas-liquid two-phase flow is widely used in petrochemical,food processing,biopharmaceutical and other fields,where the gas phase is usually dispersed in the liquid phase in the form of bubbles.Due to the change of the bubble interface and the vibration and deformation of the bubble,the variation of the flow field and vortex field is complicated during the process of bubble coalescence.In this paper,the three-dimensional bubble coalescence process is simulated using the multiphase lattice Boltzmann method.The Liutex method as well as other vortex identification methods is utilized to analyze the change of the vortex field.The results exhibit the three-dimensional Liutex spatial vector distribution.The variation of extremes of Rm,Sm,Q,Rx,Ry,Rz during the coalescence process is analyzed.The results show that the vortex variables reach the extreme value at the moment of coalescence and Liutex can accurately capture and identify the strength and direction of rotational vortex.更多还原