摘要
黄河坝跺水下根石对维护黄河岸坝的安全起着重要作用,因此,研究水下根石受力具有实际工程意义。基于黄河坝跺实际工程建立物理水槽试验和FLOW-3D软件数值模型,对比分析水平拖曳力系数的试验值和模拟值,发现两者相近。随即从块体雷诺数和块体尺寸两个方面分别比较水平拖曳力系数在物理试验和数值模拟上的区别,结果显示:水平拖曳力系数的数值模拟值大于其试验值,试验值接近0.9,模拟值接近1.1,数值模拟值更接近EVETT J B等提出的块体水平拖曳力系数;当块体雷诺数小于2×10^4时,水平拖曳力系数具有变化性;当块体雷诺数大于2×10^4时,水平拖曳力系数趋于稳定;块体的长高比和宽高比在一定范围内时,水平拖曳力系数的试验值和模拟值趋于稳定,但是超过这个范围,拖曳力系数的试验值依旧趋于稳定,模拟值将会增大。
The underwater root stone of the Yellow River dam plays an important role in maintaining the safety of the dam on the Yellow River bank.Therefore,it is of practical engineering significance to study the stress of the underwater root stone.The physical flume test and FLOW-3D software numerical model were established based on the actual project of the Yellow River dam.The experimental and simulated values of drag coefficients were compared and analyzed,and the results are similar.Thereafter,the differences of drag coefficients between physical experiments and numerical simulations were compared from two aspects of block Reynolds number and block size.The results show that the numerical simulated values of drag coefficients are greater than the experimental values,the experimental values are close to 0.9,the numerical simulated values are close to 1.1,and the numerical simulated values are closer to the block drag coefficient proposed by EVETT J B et al.The drag coefficient is variability when the block Reynolds number is less than 2×10^4,the drag coefficient tends to be stable when the block Reynolds number is greater than 2×10^4.And when the ratios of length to height and width to height are within a certain range,the experimental values and simulated values tend to be stable.However,when the ratios of length to height and width to height are beyond this specified range,the experimental values still tend to be stable,but the simulated values will increase.
作者
邹瑞
兰文改
兰雁
杨昌明
ZOU Rui;LAN Wengai;LAN Yan;YANG Changming(School of Civil Engineering and Communication,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;Yellow River Institute of Hydraulic Research,Yellow River Water Conservancy Commission,Zhengzhou 450003,China;Nanchang University,Nanchang 330031,China)
出处
《华北水利水电大学学报（自然科学版）》
2019年第5期87-94,共8页
Journal of North China University of Water Resources and Electric Power：Natural Science Edition
基金
国家自然科学基金项目(51509104)
