The effects of a spur dike location in a 90° sharp channel bend on flow field: Focus on anisotropy degree and anisotropy nature

IF 2.4 3区 环境科学与生态学 Q2 ENGINEERING, CIVIL Journal of Hydro-environment Research Pub Date : 2023-05-01 DOI:10.1016/j.jher.2023.05.001
Mojtaba Mehraein , Anton J. Schleiss , Marjan Goodarzi
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引用次数: 1

Abstract

In this research, the flow features around a spur dike located in a 90˚ sharp channel bend have been studied experimentally in detail. Results showed that the effects of the spur dike on upstream sections increased by increasing α (spur dike location from the beginning of the bend). In addition, by increasing α, the horseshoe vortex (C3) and secondary flow in the channel bend (C1) strengthened. The energy and the Reynolds shear stress in the C3 region decreased by increasing α. It is recommended to use a Barycenteric Map (BM) instead of the normal Reynolds stresses to find the anisotropy nature accurately. A strong anisotropic condition was detected at the border of the recirculation flow region and the main flow. However, in the C3 and the interaction regions, the isotropy condition improved. In the main flow region, by increasing α, the isotropy degree improved. However, by increasing α, an increase in the development of the region with a high anisotropy degree towards the recirculation region was observed. The anisotropy degree in the near-bed layer region and the shear layer region is comparable. However, the anisotropy nature is different. The maximum error of the numerical simulation based on isotropic turbulence occurred at the shear layer region where the severe cigar-shaped turbulence occurred.

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90˚急转弯处丁坝位置对流场的影响:关注各向异性程度和各向异性性质
在这项研究中,对位于90˚急转弯处的丁坝周围的流动特征进行了详细的实验研究。结果表明,丁坝对上游断面的影响随着α(丁坝位置从弯道开始)的增加而增加。此外,通过增加α,通道弯曲处的马蹄涡(C3)和二次流(C1)增强。C3区的能量和雷诺剪切应力随α的增加而减小。建议使用Barycenteric Map(BM)而不是法向雷诺应力,以准确地找到各向异性性质。在回流区和主流的边界处检测到强烈的各向异性条件。然而,在C3和相互作用区域,各向同性条件得到改善。在主流区,通过增加α,各向同性度得到改善。然而,通过增加α,观察到具有高各向异性程度的区域向再循环区域的发展增加。近床层区域和剪切层区域的各向异性程度相当。然而,各向异性的性质是不同的。基于各向同性湍流的数值模拟的最大误差出现在发生严重雪茄状湍流的剪切层区域。
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来源期刊
Journal of Hydro-environment Research
Journal of Hydro-environment Research ENGINEERING, CIVIL-ENVIRONMENTAL SCIENCES
CiteScore
5.80
自引率
0.00%
发文量
34
审稿时长
98 days
期刊介绍: The journal aims to provide an international platform for the dissemination of research and engineering applications related to water and hydraulic problems in the Asia-Pacific region. The journal provides a wide distribution at affordable subscription rate, as well as a rapid reviewing and publication time. The journal particularly encourages papers from young researchers. Papers that require extensive language editing, qualify for editorial assistance with American Journal Experts, a Language Editing Company that Elsevier recommends. Authors submitting to this journal are entitled to a 10% discount.
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