FLOW-3D气泡流模型关键参数敏感性探究  

Sensitivity Analysis of the Key Parameters of the Bubbly Flow Model in FLOW-3D

作　　者：董宗师 蔡芳 DONG Zong-shi;CAI Fang(CISPDR Corporation,Wuhan 430010,Hubei Province,China;School of Water Resources and Hydropower,Sichuan University,Chengdu 610065,Sichuan Province,China)

机构地区：[1]长江设计集团,湖北武汉430010 [2]四川大学水利水电学院,四川成都610065

出　　处：《中国农村水利水电》2023年第2期246-254,共9页China Rural Water and Hydropower

基　　金：中国博士后科学基金资助项目(2021M692754)。

摘　　要：为了探究FLOW-3D气泡流模型的黑匣子细节,以45°陡槽均匀流的试验数据为参考,对计算结果对临界韦伯数、临界毛细管数、初始气泡直径、拖曳阻力系数和Richardson-Zaki调节系数等模型参数的敏感性进行了探究。结果表明:明渠掺气水流中气泡尺寸主要受临界毛细管数控制,临界韦伯数仅在掺气水面附近对气泡大小有微弱影响。拖曳系数和Richardson-Zaki调节系数对结果的影响较大,而临界毛细管数、临界韦伯数以及气泡初始直径对计算结果的影响则相对较小。大于默认值的拖曳系数和Richardson-Zaki调节系数会提高湍流强度并增加掺气,但小于默认值的参数对计算结果的影响更为显著。因此,在使用FLOW-3D进行掺气水流模拟时,应主要对拖曳系数和Richardson-Zaki调节系数进行调校,以提高模型的准确性。In order to explore the black-box details of the FLOW-3D bubbly flow model, the effect of the model parameters including the critical Weber number, critical capillary number, initial bubble diameter, drag coefficient, and Richardson-Zaki coefficient multiplier are investigated based on the experimental data of uniform flow in a 45° steep chute. It is discovered the bubble size is dominated by the critical capillary number, whereas the critical Weber number only exhibits a certain effect near the aerated flow surface. The drag coefficient and Richardson-Zaki coefficient multiplier have a significant influence on simulation results, while the effect of the critical capillary number, the critical Weber number and the initial bubble diameter is relatively negligible. A drag coefficient or Richardson-Zaki coefficient multiplier more than the default value will enhance the turbulence and thereby increase air entrainment, and values less than the defaults have even more significant effect. Therefore, when aerated flow is simulated by using FLOW-3D, more attention should be paid to the calibration of the drag coefficient and Richardson-Zaki coefficient multiplier to improve model accuracy.

关 键 词：气泡流 掺气水流 数值模拟 FLOW-3D 敏感性分析 

分 类 号：TV135.2[水利工程—水力学及河流动力学]