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Effect of different pier spacing on open channel flow characteristics

Effect of different pier spacing on open channel flow charac...

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第十一届全国水动力学学术会议暨第二十四届全国水动力学研讨会并周培源诞辰110周年纪念大会

作者： TANG Hong-wu LI Kai-jie HUANG Zhen-ping XIAO Yang LI Yanan State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering College of Water Conservancy & Hydropower Engineering Hohai University National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety Hohai University The State Flood Control and drought Relief Headquarters Office

The open channel flow characteristics effected by piers is a classic problem in the study of ***-dimensional mathematical models for a single pier and a single row of piers open channel flows were established based on computational fluid dynamics commercial software *** standard Volume of Fluid,(VOF) method was used to simulate the free surface and the k-εmodel was used for turbulent *** time-domain dependent method was applied to solve the unsteady *** the basis of experimental data contrast with the open channel flow,the effects of the open channel flow velocity,water level,the shear stress,the drag coefficient of piers under different horizontal spacing were *** results show that compared with the single pier S / d = 3,the longitudinal velocity changes along faster;the backed up water value and the plunge water value of the center pier were both greater;the maximum shear stress and the erosion range were larger;the shielding effect between the piers was very obvious.S / d = 5.5,S / d = 8 were similar to single pier.

关键词： Piers 3d mathematical model VOF method

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3d NUMERICAL SIMULATION FOR WATER FLOWS ANd SEdIMENT dEPOSITION IN dAM AREA OF THE THREE GORGES PROJECT

3D NUMERICAL SIMULATION FOR WATER FLOWS AND SEDIMENT DEPOSIT...

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第九次河流泥沙国际学术大会

作者： Yongjun LU and Guoren dOU Nanjing Hydraulic Research Institute Nanjing 210029 China.Longxi HAN College of Environmental Engineering of Hohai University Nanjing 210098 ChinaXuejun SHAO and Xianghua YANG dept. of Hydraulic Engineering Tsinghua University Beijing 100084 China

＜正＞This paper applies a 3d mathematical model for suspended load transport in turbulent flows. Based on dou’s stochastic theory of turbulent flows, numerical schemes of Reynolds stresses for anisotropic turbulent flows are obtained. The equations for 2-d suspended load motion and sorting of bed material are expanded into a 3d case. The numerical results were validated by using measurements from the Gezhouba Project with good agreement. The present method is employed to simulate sediment erosion and deposition in the dam area of the Three Gorges Project, and the following predictions are proposed for the operation of the project: deposition process and patterns in the near-dam area of the reservoir;size distribution of the deposits and bed material;and flow fields and sediment concentration fields at different time and elevations. The calculated results are close to the experimental observations in physical models. The proposed method provides a new way for 3d simulation of sediment motion in dam areas of multi-purpose water projects.

关键词： Turbulent flows dou’s stochastic theory Nonuniform suspended load Riverbed erosion and deposition 3d mathematical model Three Gorges Project

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