Direct numerical simulation of transverse ripples. 1. Pattern initiation and bedform interactions

LAUR Repository

Show simple item record

dc.contributor.author Zgheib, N.
dc.contributor.author Fedele, J. J.
dc.contributor.author Hoyal, D. C. J. D.
dc.contributor.author Perillo, M. M.
dc.contributor.author Balachandar, S.
dc.date.accessioned 2019-11-15T14:19:31Z
dc.date.available 2019-11-15T14:19:31Z
dc.date.copyright 2018 en_US
dc.date.issued 2019-11-15
dc.identifier.issn 2169-9011 en_US
dc.identifier.uri http://hdl.handle.net/10725/11522
dc.description.abstract We present results of coupled direct numerical simulations between flow and a deformable bed in a horizontally periodic, turbulent open channel at a shear Reynolds number of Reτ = 180. The feedback between the temporally and spatially evolving bed and the flow is enforced via the immersed boundary method. Using the near‐bed flow field, we provide evidence on the role of locally intense near‐bed vortical structures during the early stages of bed formation, from the emergence of quasi‐streamwise streaks to the formation of incipient bedform crestlines. Additionally, we take a new look at a number of defect‐related bedform interactions, including lateral linking, defect and bedform repulsion, merging, and defect creation, and show that the underlying mechanisms, in these flow‐aligned interactions, are very similar to each other. Consequently, the interactions are labeled differently depending on the geometry of interacting structures and the outcome of the interaction. In the companion paper, we compare our results to published experimental data and provide an extensive quantitative analysis of the bed, where we demonstrate the importance of neighboring structures, especially upstream neighbors, on bedform dynamics (growth/decay and speed) and wave coarsening. Video files of bed evolution are available in the supporting information. en_US
dc.language.iso en en_US
dc.title Direct numerical simulation of transverse ripples. 1. Pattern initiation and bedform interactions en_US
dc.type Article en_US
dc.description.version Published 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.relation.journal Journal of Geophysical Research: Earth Surface en_US
dc.journal.volume 123 en_US
dc.journal.issue 3 en_US
dc.article.pages 448-477 en_US
dc.keywords Direct numerical simulations en_US
dc.keywords Pattern formation en_US
dc.keywords Bedform interactions en_US
dc.keywords Coupled bed‐flow simulation en_US
dc.keywords Ripples en_US
dc.keywords Self‐similarity en_US
dc.identifier.doi https://doi.org/10.1002/2017JF004398 en_US
dc.identifier.ctation Zgheib, N., Fedele, J. J., Hoyal, D. C. J. D., Perillo, M. M., & Balachandar, S. (2018). Direct numerical simulation of transverse ripples: 1. Pattern initiation and bedform interactions. Journal of Geophysical Research: Earth Surface, 123(3), 448-477. en_US
dc.author.email nadim.zgheib@lau.edu.lb en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php en_US
dc.identifier.url https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017JF004398 en_US
dc.note This article is a companion to Zgheib et al. (2018) https://doi.org/10.1002/2017JF004399 en_US
dc.orcid.id https://orcid.org/0000-0002-1032-8005 en_US
dc.author.affiliation Lebanese American University en_US

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search LAUR

Advanced Search


My Account