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dc.contributor.authorZhou, Zheyu  Concept link
dc.contributor.authorYu, Xiao  Concept link
dc.contributor.authorHsu, Tian-Jian  Concept link
dc.contributor.authorShi, Fengyan  Concept link
dc.contributor.authorGeyer, W. Rockwell  Concept link
dc.contributor.authorKirby, James T.  Concept link
dc.date.accessioned2017-07-06T14:53:07Z
dc.date.available2017-10-11T08:40:46Z
dc.date.issued2017-04-11
dc.identifier.citationJournal of Geophysical Research: Oceans 122 (2017): 3081–3105en_US
dc.identifier.urihttps://hdl.handle.net/1912/9069
dc.descriptionAuthor Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 122 (2017): 3081–3105, doi:10.1002/2016JC012334.en_US
dc.description.abstractThe nonhydrostatic surface and terrain-following coastal model NHWAVE is utilized to simulate a continually forced stratified shear flow in a straight channel, which is a generic problem to test the existing nonhydrostatic coastal models' capability in resolving shear instabilities in the field scale. The resolved shear instabilities in the shear layer has a Reynolds number of about 1.4 × 106, which is comparable to field observed value. Using the standard Smagorinsky closure with a grid size close to the Ozmidov length scale, simulation results show that the resolved energy cascade exceeds 1 order of magnitude and the evolution and turbulent mixing characteristics are predicted well. Two different approaches are used to estimate the turbulent dissipation rate, namely using the resolved turbulent energy spectrum and the parameterized subgrid turbulent dissipation rate, and the predicted results provide the upper and lower bounds that encompass the measured values. Model results show significantly higher turbulence in braids of shear instabilities, which is similar to field observations while both the subgrid turbulent dissipation rate and resolved vorticity field can be used as surrogates for measured high acoustic backscatter signals. Simulation results also reveal that the surface velocity divergence/convergence is an effective identifier for the front of the density current and the shear instabilities. To guide future numerical studies in more realistic domains, an evaluation on the effects of different grid resolutions and subgrid viscosity on the resolved flow field and subgrid dissipation rate are discussed.en_US
dc.description.sponsorshipOffice of Naval Research Grant Numbers: N00014-15-1-2612 , N00014-16-1-2948; National Science Foundation Grant Numbers: OCE-1334325 , OCE-1232928; Extreme Science and Engineering Discovery Environment (XSEDE) SuperMIC Grant Number: TG-OCE100015en_US
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/2016JC012334
dc.subjectNonhydrostatic modelen_US
dc.subjectShear instabilitiesen_US
dc.subjectStratified shear flowen_US
dc.subjectSurface signaturesen_US
dc.titleOn nonhydrostatic coastal model simulations of shear instabilities in a stratified shear flow at high Reynolds numberen_US
dc.typeArticleen_US
dc.description.embargo2017-10-11en_US
dc.identifier.doi10.1002/2016JC012334


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