半球形粗糙度间距对不同水流淹没度下双平均湍流特性的影响

IF 1.1 4区工程技术 Q3 ENGINEERING, CIVIL

Canadian Journal of Civil Engineering Pub Date : 2024-01-09 DOI:10.1139/cjce-2023-0360

Jayanta Shounda, K. Barman, K. Debnath

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引用次数: 0

摘要

对由不同间距（p/r = 2、4、6 和 8；p = 间距；r = 半球高度）的半球形元件组成的粗糙床面的双平均（DA）湍流特性进行了量化，适用于三种潜流[h/r = 7.14、5.35、3.57；平均流深 (h)= 20 厘米、15 厘米和 10 厘米]。湍流动能的产生率和耗散率在波峰处和波峰下方最大。在界面下层，p/r = 4 时各向异性程度最大，p/r = 8 时外层恢复各向同性的趋势最强。在底层区域产生的湍流在外层区域仍存在于低水流沉没度的情况下。湍流强度按粗糙度顺序（从高到低）保持不变，即 p/r = 4 > 2 > 6 > 8 > 平面床；其中流量-沉没度的变化不会改变这一顺序。

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Effect of hemispherical roughness spacing on Double-averaged turbulence characteristics for different flow submergence

The double-averaged (DA) turbulence characteristics over rough bed comprising of hemispherical elements with different spacing (p/r = 2, 4, 6, and 8; p = pitch distance; r = height of hemisphere) is quantified for three flow-submergences [h/r = 7.14, 5.35, 3.57; mean flow-depth (h)= 20 cm, 15 cm, and 10 cm]. The production and dissipation rates of turbulent kinetic energy are maximum at and below the crest level. Within interfacial sublayer, the degree of anisotropy is observed to be maximum for p/r = 4 and the tendency for the return to isotropy is strongest for p/r = 8 in the outer layer. The turbulence generated in the bottom region is still present in the outer region for low flow-submergences. The turbulence strength is maintained in the roughness order (descending) as p/r = 4 >2> 6 > 8 > plane bed; wherein the change in flow-submergence does not change this order.

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来源期刊

Canadian Journal of Civil Engineering 工程技术-工程：土木

CiteScore

3.00

自引率

7.10%

发文量

105

审稿时长

14 months

期刊介绍： The Canadian Journal of Civil Engineering is the official journal of the Canadian Society for Civil Engineering. It contains articles on environmental engineering, hydrotechnical engineering, structural engineering, construction engineering, engineering mechanics, engineering materials, and history of civil engineering. Contributors include recognized researchers and practitioners in industry, government, and academia. New developments in engineering design and construction are also featured.