Experimental and numerical investigations of primary flow patterns and mixing in laboratory meandering channel
Experimental and numerical investigations of primary flow patterns and mixing in laboratory meandering channel
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实验室曲流通道中一次流型和混合的实验和数值研究
DOI：
10.1186/s40713-019-0016-y
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Jung
中科院分区：
文献类型：
--
作者：
S. Park;Jung
考虑到弯曲形态、泥沙等水力特性的影响，在水力学、流体力学和试验分析的基础上，需要同时用数学方法进行分析，本文基于二维对流-弥散方程，对实验室试验渠道进行了分析，以揭示水力特性和纵横向系数的影响。此外，实验结果进行了比较与水平二维分布的流速和浓度场相对于水深和进口流量使用二维深度平均的数值模型的基础上的FEM（有限元法）。在相同的实验条件下，对SMS和RAMS进行了比较。从速度剖面的分析，一次流和二次流已经可视化。此外，污染物云的结果说明从示踪剂试验的结果与一个瞬时和中心注入的溶质传输，分离，叠加和停滞可以推断出两个弯曲的部分向外。同样的流速特性和污染物输移特性也可以用二维数值模式来定义。
Considering fundamental hydraulics, fluid dynamics, and experimental analysis should be analyzed simultaneously with mathematical methods due to the effects of hydraulic properties such as meandering form, sediment, and so on. In this research, to reveal the effects of hydraulic characteristics and longitudinal and transverse coefficients based on the two-dimensional advection-dispersion equation, a laboratory experimental channel has been conducted and analyzed. Additionally, results of experiments have been compared with horizontal two dimensional distributions of flow velocity and concentration fields with respect to the water depth and inlet discharge using two-dimensional depth-averaged numerical models based on FEM (Finite Element Method). SMS and RAMS have been applied with the same experimental conditions and compared. From the analysis of velocity profiles, primary and secondary flows have been visualized. Also the result of pollutant clouds illustrated from the results of tracer tests with an instantaneous and centered injection of solute transport, separation, superposition and stagnation could be deduced outwards of two meandering sections. And same types of characteristics of velocity and pollutant transport could be defined with two-dimensional numerical models.