期刊
JOURNAL OF HYDRAULIC RESEARCH
卷 57, 期 2, 页码 183-196出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00221686.2018.1473296
关键词
Bed roughness; drag coefficient; hydraulic resistance; open-channel flow turbulence; self-affine fractal surface
资金
- Engineering and Physical Sciences Research Council [EP/K041088/1]
- Australian Research Council [FL120100017]
- Australian Research Council [FL120100017] Funding Source: Australian Research Council
- EPSRC [EP/K041088/1] Funding Source: UKRI
Knowledge of hydraulic resistance of single-valued self-affine fractal surfaces remains very limited. To advance this area, a set of experiments have been conducted in two separate open-channel flumes to investigate the effects of the spectral structure of bed roughness on the drag at the bed. Three self-affine fractal roughness patterns, based on a simple but realistic three-range spectral model, have been investigated with spectral scaling exponents of -1, -5/3 and -3, respectively. The different widths of the flumes and a range of flow depths also afforded an opportunity to consider effects of the flow aspect ratio and relative submergence. The results show that with all else equal the friction factor increases as the spectral exponent decreases. In addition, the relationship between the spectral exponent and effective slope of the roughness is demonstrated, for the first time. Aspect ratio effects on the friction factor within the studied range were found to be negligible.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据