Two-way coupled direct numerical simulations of sinuous-crested bedforms

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dc.contributor.author Zgheib, Nadim
dc.contributor.author Balachandar, S.
dc.date.accessioned 2019-11-19T14:16:34Z
dc.date.available 2019-11-19T14:16:34Z
dc.date.copyright 2019 en_US
dc.date.issued 2019-11-19
dc.identifier.uri http://hdl.handle.net/10725/11542
dc.description.abstract We present results from direct numerical simulations on the transition from straight-crested to sinuous-crested bedforms. The numerical setup is representative of turbulent open channel flow over an erodible sediment bed at a shear Reynolds number of \textit{Re}τ=180 \begin{figure}[htbp] \centerline{\includegraphics[width=0.72in,height=0.19in]{090720191.eps}} \label{fig1} \end{figure} . The immersed boundary method accounts for the presence of the sediment bed. The simulations are two-way coupled in the sense that the turbulent flow can erode and modify the sediment bed, and in turn, the sediment bed modifies the overlying flow. The coupling from the flow to the sediment bed occurs through the Exner equation, while the back coupling from the bed to the flow is achieved by imposing the no-slip and no-penetration condition at the immersed boundary. The simulation setup is similar to that by Zgheib et al. (\underline {https://doi.org/10.1002/2017JF004398}) except for the presence of sidewalls to better mimic laboratory flume conditions. Sidewalls are observed to significantly increase bedform sinuosity. We also investigate the effect of domain size and a zero sediment flux boundary condition on crestline sinuosity. en_US
dc.language.iso en en_US
dc.title Two-way coupled direct numerical simulations of sinuous-crested bedforms en_US
dc.type Conference Paper / Proceeding en_US
dc.author.school SOE en_US
dc.author.idnumber 201706684 en_US
dc.author.department Industrial And Mechanical Engineering en_US
dc.description.embargo N/A en_US
dc.identifier.ctation Zgheib, N., & Balachandar, S. (2019). Two-way coupled direct numerical simulations of sinuous-crested bedforms. Bulletin of the American Physical Society. en_US
dc.conference.date November 23–26, 2019 en_US
dc.conference.place Seattle, Washington en_US
dc.conference.title 72nd Annual Meeting of the APS Division of Fluid Dynamics en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php en_US
dc.identifier.url http://meetings.aps.org/Meeting/DFD19/Session/C38.3 en_US
dc.orcid.id https://orcid.org/0000-0002-1032-8005 en_US
dc.author.affiliation Lebanese American University en_US

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