枢纽互通区平面二维水流数值模拟研究

等宽明渠交汇口平面二维水流数值模拟谭柱林;彭杨;肖杨【摘要】采用雷诺平均Navier-Stokes(RANS)方程组,其中动量方程的雷诺应力项用雷诺应力(RAM)模型求解,运用Fluent软件模拟了90°等宽明渠交汇口6种流量比的二维水流运动.通过将数值模拟的分离区尺寸与试验资料进行比较,发现用RAM模型模拟在小流量比流动精度较高,建议采用采用混合湍流模型:当流量比小于0.583取RAM模型计算值,否则取H-L模型计算,并绘制了分离区长度、宽度与流量比关系图.【期刊名称】《水运工程》【年(卷),期】2012(000)002【总页数】4页(P46-49)【关键词】交汇口;雷诺应力模型;分离区;数值模拟【作者】谭柱林;彭杨;肖杨【作者单位】华北电力大学可再生能源学院,北京102206;华北电力大学可再生能源学院,北京102206;华北电力大学可再生能源学院,北京102206【正文语种】中文【中图分类】TV91明渠水流交汇广泛存在于自然河流和水利工程中，在交汇口处主支流相互掺混顶托，下游靠近支流一端会产生分离区。

交汇口水流如图1所示，支流进入主渠后，由于附壁效应及主支流相互挤压，交汇口下游出现断面环流（二次流）；支流在汇流口侧下游附近形成尺寸沿水深变化的水流分离区（回流涡旋区）；外部水流收缩，形成折向主槽外侧边壁收缩区；交汇口上游水面局部隆起，形成壅水区，改变流量与水位的单一对应关系[1]。

对河流交汇分离区的特性研究表明，分离区流速结构变化对河流物质输移和河床演变产生较大影响，由分离区长度和宽度确定水流加速区和减速区的位置，对于预测交汇区的物质输移和河床演变具有重要意义[2]。

图1 交汇口水流结构交汇口分离区同时受多方面因素影响，可分为几何因素（如交汇口形状、主支槽宽、槽底坡降、交汇角度等）和水力因素（如干支流流量比值、糙率、水流弗劳德数等），可从理论分析、试验测量和数值模拟等方面进行研究。

水洞沟水库二维水流运动数值模拟杨程;李春光;景何仿;吕岁菊【摘要】In order to predict the sedimentation deposition in the Shuidonggou Reservoir in next few years, the flow in this reservoir is studied using a two dimensional (2-D) hydraulic mathematical model, and the governing equations are modeled with finite volume method (FVM) on unstructured grids. Using the measured data to verify the correctness of the model, and then the 2-D flow movement of several different conditions was simulated. The results show that: when the amount of the water inflow and with the same quantity of the water drawn are the same and unchanged, as the water level drops, water flow velocity increases in the reservoir;the water directly flows to the water intake point, gradually shift to the right bank deviation, and then shift to the left, gradually transformed along the left bank and flow to the intake;the recirculation zone on the left of the water intake point becomes smaller, and the effects of the influent on the right recirculation zone increases gradually. When the amount of the water inflow and quantity of water drawn are not the same and unchanged, as the water level drops, water flow velocity increases in the reservoir;the water directly flows to the tail dam, and then gradually to the right bank deviation, and the effects of the influent on the water intake point increases gradually. Through the simulation of different conditions, movement of the flow in the reservoir was obtained. Combined the measured sediment concentration of the water inlet and water intake,the sedimentation deposition in the reservoir is analyzed and some management suggestions are put forward.%为了预测未来几年水洞沟水库的冲淤情况，在考察库区水流运动规律的基础上，建立平面二维水流运动数学模型，采用非结构网格的有限体积法，利用实测流场数据验证了所建数学模型的正确性。