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dc.contributor.authorD’Alessandro, Gianmarco
dc.contributor.authorHantsis, Zvi
dc.contributor.authorMarchioli, Cristian
dc.contributor.authorPiomelli, Ugo
dc.date.accessioned2021-10-27T17:01:56Z
dc.date.available2021-10-27T17:01:56Z
dc.date.issued2021-04-28
dc.identifier.citationD’Alessandro, G.; Hantsis, Z.; Marchioli, C.; Piomelli, U. Accuracy of Bed-Load Transport Models in Eddy-Resolving Simulations. International journal of multiphase flow 2021, 141, 103676–. https://doi.org/10.1016/j.ijmultiphaseflow.2021.103676.en
dc.identifier.urihttp://hdl.handle.net/1974/29530
dc.descriptionThe final publication is available at Elsevier via https://doi.org/10.1016/j.ijmultiphaseflow.2021.103676 © 2021.en
dc.description.abstractThis work investigates the accuracy of commonly used bed-load transport models when applied in combination with high-resolution Navier-Stokes solvers. Empirical bed-load models predict the transport rate of sediments based on the average bottom shear-stress, while eddy-resolving approaches allow for a space- and time-dependent description of the bottom shear-stress distribution. We discuss the effect that a fine-graining of the stress distribution provided by the flow solver has on the transport model prediction, and we examine the space and time scales at which the averaged values of the transport rate, obtained using the local stress distribution, converge to the transport rate predicted using the average stress. To this aim, we performed Direct Numerical Simulation of a channel flow and used the resulting database to mimic Wall-Resolved and Wall-Modelled Large-Eddy Simulations. We compared the prediction of several bed-load transport models to experimental measurements in order to identify and highlight the limitations that stem from the coupling of these models with eddy-resolving techniques. We find that for small values of the Shields parameter (ratio of viscous and gravitational forces) the fine spatial and temporal resolution of wall-resolved simulations can yield overestimation of the bed-load transport rate; whereas more coarse-grained methods, such as wall-modelled Large Eddy Simulation, result in improved predictions. We also show that a short-time averaging of the force exerted by the fluid on the sediments, which we tested in three different configurations (channel flow with smooth and rough walls and flow over an idealized two-dimensional river dune), improves the accuracy of the bed-load transport predictions, thus providing indications about the flow scales that control the transport process.en
dc.language.isoenen
dc.publisherElsevieren
dc.relationDiscovery Grants Programen
dc.subjectBed-load transporten
dc.subjectOpen-channel flowen
dc.subjectDuneen
dc.subjectTurbulenceen
dc.subjectRANS simulationen
dc.subjectLarge eddy simulationen
dc.subjectDirect numerical simulationen
dc.titleAccuracy of bed-load transport models in eddy-resolving simulationsen
dc.typejournal articleen
dc.identifier.doihttps://doi.org/10.1016/j.ijmultiphaseflow.2021.103676
project.funder.identifierhttp://dx.doi.org/10.13039/501100000038en
project.funder.identifierhttp://dx.doi.org/10.13039/501100001804en
project.funder.identifierhttp://dx.doi.org/10.13039/501100000236en
project.funder.nameNatural Science and Engineering Research Council of Canadaen
project.funder.nameCanada Research Chairsen
project.funder.nameOntario Trillium Foundationen


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