Journal article
Direct numerical simulation of open-channel flow over smooth-to-rough and rough-to-smooth step changes
A Rouhi, D Chung, N Hutchins
Journal of Fluid Mechanics | CAMBRIDGE UNIV PRESS | Published : 2019
DOI: 10.1017/jfm.2019.84
Abstract
Direct numerical simulations (DNS) are reported for open-channel flow over streamwise-alternating patches of smooth and fully rough walls. The rough patch is a three-dimensional sinusoidal surface. Owing to the streamwise periodicity, the flow configuration consists of a step change from smooth to rough, and a step change from rough to smooth. The friction Reynolds number varies from 437 over the smooth patch to 704 over the rough patch. Through the fully resolved DNS dataset it is possible to explore many detailed aspects of this flow. Two aspects motivate this work. The first one is the equilibrium assumption that has been widely used in both experiments and computations. However, it is no..
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Awarded by Australian Research Councils Discovery Projects funding scheme
Funding Acknowledgements
This research was supported by resources provided by the Pawsey Supercomputing Centre with funding from the Australian Government and the Government of Western Australia and by the National Computing Infrastructure (NCI), which is supported by the Australian Government. This research was partially supported under the Australian Research Councils Discovery Projects funding scheme (project DP160103619). The authors acknowledge the helpful comments by Professor E. Bou-Zeid and the two other anonymous referees.