定向腹沟角对弯曲水流水力特性影响的数值研究

Zhouyiqi Chen, Xiaohe Zheng, Liang-duo Shen
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引用次数: 1

摘要

在弯曲河道中铺设直堤后,水流特性随着安装角度的不同而显著不同。为了探讨这一问题,本文利用MIKE3 FM对60°内弯通道单直堤模型进行了选择不同角度的三维数值模拟,对不同角度、转角等流场结构和表面形态的流动情况进行了探讨。结果表明:当直堤角度增大时,直堤周围的流场结构和表面形貌都会发生变化;主要分布在坝后再循环区,呈先增后减的趋势。上游地区水面横向梯度先增大后减小。下游区域水面横向梯度先减小后增大。骨骨堤是护岸工程和航道整治中常用的建筑物,具有保护堤岸、疏导水道、改善航道条件、维持河相、保证水环境多样化等作用。目前,对围堤水流特性的分析主要通过河道模型试验和数值模拟。Kang[1]利用LES(大涡模拟)方法研究分析了直流道水箱中矩形直堤附近的三维流场,并分析了直堤前后的水流结构。Outllon等[2]采用标准k ε−模型模拟Holtz直堤试验,计算了回流带的相对长度。Akahori等[3]采用非静压三维模型模拟了Muneta等的直槽试验的绕流。国内李志勤、李宏等[4]采用标准k ε−模型结合控制体积法对直堤周围自由水面进行了模拟,结果与实测值基本一致。本文采用MIKE3 FM模型模拟了连续型非淹没直堤的再循环特性。计算结果与Han等[5]的实验结果吻合较好。在此基础上,利用三维模型研究了60°弯曲水流中不同角度的非淹没直突堤对曲线周围流场及表面形态的影响。研究成果可为河道整治和支线设计施工提供参考,具有重要的理论价值和实际工程意义。三维流动数学模型[6]的控制方程为:u v w S x y z。(1)
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Study on Influence of Oriented Groin Angle on Hydraulic Characteristics of Curved Water Flow
After the spur dike is laid in the curved channel, the water flow characteristics are significantly different with the angle of the installation. To explore this problem, by using MIKE3 FM within 60°bend channel model of single spur dike to choose different angle to the three-dimensional numerical simulation of flow around the situation and the different angle, corner the flow field structure and surface morphology analysis, such as flow is discussed in this paper. The results show that: When the angle of the spur dike is increased, the flow field structure and surface morphology around the spur dike will change. Mainly in the area of the recirculation zone after the dam, first increase and then decrease. The transverse gradient of the water surface in the upstream area increases first and then decreases. The transverse gradient of the water surface in the downstream area decreases first and then increases. Spur dike is a commonly used building in revetment works and waterway remediation, which has the functions of protecting bank embankment, bunching water to channel, improving waterway conditions, maintaining river facies and guaranteeing diversification of aquatic environment. At present, the analysis of the characteristics of the water flow around the spur dike mainly through the river model test and numerical simulation. Kang [1] used LES (large eddy simulation) method to study and analyze the three-dimensional flow field near the rectangular spur dike in the straight channel water tank, and also analyzed the water flow structure before and after the spur dike. Outllon et al. [2] used a standard k ε−model to simulate Holtz's spur dike test and calculate the relative length of recirculation zone. Akahori et al. [3] used a nonstatic pressure three-dimensional model to simulate the flow around the spur tank test of Muneta et al. Domestic Li Zhiqin, Li Hong et al [4] used a standard k ε−model coupled with the control volume method to simulate the free water surface around the spur dike, and the results are basically consistent with the measured values. In this paper, the MIKE3 FM model is used to simulate the flow recirculation characteristics of continuous non-submerged spur dike. The calculation results are in good agreement with the experimental results of Han et al. [5]. On this basis, the three-dimensional model is used to study the influence of different angles of nonsubmerged straight spur dike on the flow field and surface morphology around the curve in the 60° curved water flow. The research results can provide reference for channel Regulation and spur design and construction which have important theoretical value and practical engineering significance. Mathematical Model Control Equation The governing equation of the three-dimensional flow mathematical model [6], as follows: u v w S x y z          . (1)
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