双圆柱下游污染物浓度分布特性研究
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摘要
利用计算流体力学(CFD)方法,在雷诺数Re=1×10~6的条件下,对双圆柱不同布置方式下的污染物绕流现象进行了数值模拟,比较了双圆柱在不同排列方式和间距条件下对流场结构以及污染物输移混合特性的影响,分析了横向尾涡摆动和纵向速度剪切作用对污染物分布的影响机制。结果表明,双柱并列条件下,随着间距比G/D的不断变化,污染物浓度脉动强度分布沿程表现出先增大后减小的变化趋势;G/D≥2时,双圆柱各自产生的尾流涡街相互作用程度较弱,可忽略对其污染物扩散的影响。双柱串列条件下,污染物的横向影响范围经历了先增大后减小的过程;G/D≤0.25时,双柱串列可视为一个整体。
Under the condition of Re = 1 × 10~6, the pollutant transportation with different double-cylinders arrangements are simulated with CFD method. After comparing the flow fields and pollutant concentrations under different arrangements and spacing conditions of cylinders, the influencing mechanism of the horizontal wake votex sway and velocity gradient on pollutant concentration distribution are analyzed. The results show that,( a) when double cylinders are arranged in parallel mode, the concentration fluctuation intensity firstly increases and then decreases with the increase of the ratio of gap to cylinder diameter,and the wake caused by each cylinder has weak interaction between each other which can be ignored on the influence of pollutant dispersion when the ratio of gap to cylinder diameter not less than 2; and( b) when double cylinders are arranged in tandem mode, the influencing area of pollutant also experiences a process of from increase to decrease with the increase of distance, and when the ratio of gap to cylinder diameter is less than or equal to 0. 25, double cylinders in tandem arrangement can be regarded as an integration.
Under the condition of Re = 1 × 10~6, the pollutant transportation with different double-cylinders arrangements are simulated with CFD method. After comparing the flow fields and pollutant concentrations under different arrangements and spacing conditions of cylinders, the influencing mechanism of the horizontal wake votex sway and velocity gradient on pollutant concentration distribution are analyzed. The results show that,( a) when double cylinders are arranged in parallel mode, the concentration fluctuation intensity firstly increases and then decreases with the increase of the ratio of gap to cylinder diameter,and the wake caused by each cylinder has weak interaction between each other which can be ignored on the influence of pollutant dispersion when the ratio of gap to cylinder diameter not less than 2; and( b) when double cylinders are arranged in tandem mode, the influencing area of pollutant also experiences a process of from increase to decrease with the increase of distance, and when the ratio of gap to cylinder diameter is less than or equal to 0. 25, double cylinders in tandem arrangement can be regarded as an integration.
引文
[1]何国建,方红卫,府仁寿.桥墩群对河道水流影响的三维数值分析[J].水动力学研究与进展:A辑,2007,22(3):345-351.
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[15]高洋洋.多柱体系统静止绕流与涡激振动的试验及数值研究[D].青岛:中国海洋大学,2011.
[16]YANG Kun,CHENG Liang,AN Hongwei,et al.The effect of a piggyback cylinder on the flow characteristics in oscillatory flow[J].Ocean Engineering,2013,62(2):45-55.
[17]于定勇,崔肖娜,唐鹏.并列双圆柱绕流的水动力特性研究[J].中国海洋大学学报:自然科学版,2015,45(5):107-113.
[18]ZHAO M,CHENG L,TENG B,et al.Hydrodynamic forces on dual cylinders of different diameters in steady currents[J].Journal of Fluids and Structures,2008,23(1):59-83.
[19]晏智锋.浅水尾流流动特征及污染物输移扩散特性研究[D].北京:清华大学,2010.
[20]梁东方,李玉梁江春波,等.岛屿尾流近区浓度的分布特性[J].清华大学学报:自然科学版,2001,41(8):117-120.
[21]梁东方,李玉梁,陈嘉范.半岛浅水尾流近区流动特性的试验研究[J].自然科学进展,2004,14(4):431-435.
[22]LOURENCO L M,SHIH C.Characteristics of the plane turbulent near-wake of a circular cylinder[M].Stanford:Stanford University,1993.
[2]JIN Jun,MENG Bo.Computation of wave loads on the superstructures of coastal highway bridges[J].Ocean Engineering,2011,38(17-18):2185-2200.
[3]李文文.高桩码头桩群对河道水流特性影响的试验研究[D].乌鲁木齐:新疆农业大学,2005.
[4]LIANG Dongfang,CHENG Liang,LI Fangjun.Numerical modeling of flow and scour below a pipeline in currents[J].Coastal Engineering,2005,52(1):43-62.
[5]陈薛浩,朱志夏.基于Fluent的海底管线附近流场分析[J].上海交通大学学报,2012,46(3):458-462.
[6]SONG Jining,LU Lin,TENG Bin,et al.Laboratory tests of vortexinduced vibrations of a long flexible riser pipe subjected to uniform flow[J].Ocean Engineering,2011,38(11-12):1308-1322.
[7]COUTANCEAU M,DEFAYE J-R.Circular cylinder wake configurations:A flow visualization survey[J].Applied Mechanics Reviews,1991,44(6):255-305.
[8]涂程旭,王昊利,林建忠.圆柱绕流的流场特性及涡脱落规律研究[J].中国计量学院学报,2008,19(2):98-103.
[9]王亚玲,刘应中,缪国平.圆柱绕流的三维数值模拟[J].上海交通大学学报,2001,35(10):1464-1469.
[10]姚熊亮,方媛媛,戴绍仕,等.基于LES方法圆柱绕流三维数值模拟[J].水动力学研究与进展:A辑,2007,22(5):564-572.
[11]樊娟娟,唐友刚,张若瑜,等.高雷诺数下圆柱绕流与大振幅比受迫振动的数值模拟[J].水动力学研究与进展:A辑,2012,27(1):24-32.
[12]PRASANTH T K,MITTAL S.Flow-induced oscillation of two circular cylinders in tandem arrangement at low Re[J].Journal of Fluids and Structures,2009,25(6):1029-1048.
[13]滕丽娟,张志伟,武燕蕾.湍流模型下双柱绕流升阻力系数数值模拟[J].河北工程大学学报:自然科学版,2009,26(2):51-54.
[14]滕丽娟.不同排列方式下的双圆柱、三圆柱绕流数值模拟[D].邯郸:河北工程大学,2009.
[15]高洋洋.多柱体系统静止绕流与涡激振动的试验及数值研究[D].青岛:中国海洋大学,2011.
[16]YANG Kun,CHENG Liang,AN Hongwei,et al.The effect of a piggyback cylinder on the flow characteristics in oscillatory flow[J].Ocean Engineering,2013,62(2):45-55.
[17]于定勇,崔肖娜,唐鹏.并列双圆柱绕流的水动力特性研究[J].中国海洋大学学报:自然科学版,2015,45(5):107-113.
[18]ZHAO M,CHENG L,TENG B,et al.Hydrodynamic forces on dual cylinders of different diameters in steady currents[J].Journal of Fluids and Structures,2008,23(1):59-83.
[19]晏智锋.浅水尾流流动特征及污染物输移扩散特性研究[D].北京:清华大学,2010.
[20]梁东方,李玉梁江春波,等.岛屿尾流近区浓度的分布特性[J].清华大学学报:自然科学版,2001,41(8):117-120.
[21]梁东方,李玉梁,陈嘉范.半岛浅水尾流近区流动特性的试验研究[J].自然科学进展,2004,14(4):431-435.
[22]LOURENCO L M,SHIH C.Characteristics of the plane turbulent near-wake of a circular cylinder[M].Stanford:Stanford University,1993.
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