Flow development in rough-bed open channels: mean velocities, turbulence statistics, velocity spectra, and secondary currents
Flow development in rough-bed open channels: mean velocities, turbulence statistics, velocity spectra, and secondary currents
复制标题
粗糙床明渠中的流动发展:平均速度、湍流统计、速度谱和二次流
DOI:
10.1080/00221686.2022.2132311
复制
发表时间:
2022
影响因子:
2.3
通讯作者:
Zampiron A
中科院分区:
文献类型:
--
作者:
Zampiron A
The channel length required for the development of the flow, from the channel entrance to full establishment, is often a prerequisite when designing hydraulic structures or planning research experiments in open channels. However, the information on the flow development length () is scarce, and even its definition remains vague. In hydraulic experiments, this lack of knowledge introduces great uncertainty, often making comparisons of findings from different studies questionable. This paper offers a physics-based definition for, and reports results of systematic laboratory studies to provide guidance on its quantitative assessment. Our data for uniform flows suggest that up to 100 flow depths () are required for mean velocity field (including sidewall secondary currents), turbulent stresses (except streamwise variance), velocity skewness and kurtosis, and depth-scale large-scale-motions to become essentially independent of the streamwise coordinate. However, very large-scale-motions, streamwise velocity variance, and roughness-induced secondary currents are found to require longerof around.
登录
查看更多内容
影响因子:
3.7
作者:
Cameron, S. M.;Nikora, V. I.;Stewart, M. T.
通讯作者:
Stewart, M. T.
影响因子:
1.2
作者:
J. Reichert;R. Azad
通讯作者:
R. Azad
影响因子:
3.7
作者:
A. Zampiron;S. Cameron;V. Nikora
通讯作者:
V. Nikora
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
J. Doherty;P. Ngan;J. Monty;M. S. Chong
通讯作者:
M. S. Chong
DOI:
--
发表时间:
2020
期刊:
影响因子:
--
作者:
A. Zampiron;V. Nikora;S. Cameron;W. Patella;Isacco Valentini;M. Stewart
通讯作者:
M. Stewart