Turbulence structures in flows over a submerged weir

Chaewoong Ban, Sung Uk Choi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Local scour downstream of a weir is common problem, which can result in serious damage to the weir itself and instability of the downstream channel. Local scour downstream of the weir can be attributed to the force exerted on the bed by highly 3D flows generated by the weir. Specifically, such flows are characterized by the separated shear layer and unsteady large-scale coherent structures. This study presented the results of large eddy simulation (LES) of the flow over a submerged weir to investigate the characteristics of the turbulent flows downstream of the weir. LES was applied to the flat bed (FB) case and the deformed bed (DB) case with a scour hole. Time-averaged velocity was compared with measured data for validating computations. Coherent structures near the bed were examined using uw quadrant analysis. For the FB case, the splats occur frequently with strong sweep event near the reattachment point. On the contrary, the splats rarely occur and relatively weak sweep events remain near the reattachment point for the DB case.

Original languageEnglish
Title of host publicationRiver Flow 2020 - Proceedings of the 10th Conference on Fluvial Hydraulics
EditorsWim Uijttewaal, Mario J. Franca, Daniel Valero, Victor Chavarrias, Claudia Ylla Arbos, Ralph Schielen, Ralph Schielen, Alessandra Crosato
PublisherCRC Press/Balkema
Pages178-184
Number of pages7
ISBN (Electronic)9780367627737
Publication statusPublished - 2020
Event10th Conference on Fluvial Hydraulics, River Flow 2020 - Virtual, Online, Netherlands
Duration: 2020 Jul 72020 Jul 10

Publication series

NameRiver Flow 2020 - Proceedings of the 10th Conference on Fluvial Hydraulics

Conference

Conference10th Conference on Fluvial Hydraulics, River Flow 2020
Country/TerritoryNetherlands
CityVirtual, Online
Period20/7/720/7/10

Bibliographical note

Publisher Copyright:
© 2020 Taylor & Francis Group, London

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes
  • Geotechnical Engineering and Engineering Geology

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