dc.contributor.author Naqavi, Iftekhar en dc.contributor.author Tyacke, James en dc.contributor.author Tucker, Paul en dc.date.accessioned 2018-10-10T05:19:39Z dc.date.available 2018-10-10T05:19:39Z dc.date.issued 2018-10-10 en dc.identifier.issn 0022-1120 dc.identifier.uri https://www.repository.cam.ac.uk/handle/1810/283456 dc.description.abstract A direct numerical simulation (DNS) of a plane wall jet is performed at a Reynolds number of $Re_{j}=7500$ . The streamwise length of the domain is long enough to achieve self-similarity for the mean flow and the Reynolds shear stress. This is the highest Reynolds number wall jet DNS for a large domain achieved to date. The high resolution simulation reveals the unsteady flow field in great detail and shows the transition process in the outer shear layer and inner boundary layer. Mean flow parameters of maximum velocity decay, wall shear stress, friction coefficient and jet spreading rate are consistent with several other studies reported in the literature. Mean flow, Reynolds normal and shear stress profiles are presented with various scalings, revealing the self-similar behaviour of the wall jet. The Reynolds normal stresses do not show complete similarity for the given Reynolds number and domain length. Previously published inner layer budgets based on LES are inaccurate and those that have been measured are only available in the outer layer. The current DNS provides fully balanced, explicitly calculated budgets for the turbulence kinetic energy, Reynolds normal stresses and Reynolds shear stress in both the inner and outer layers. The budgets are scaled with inner and outer variables. The inner-scaled budgets in the near wall region show great similarity with turbulent boundary layers. The only remarkable difference is for the turbulent diffusion in the wall-normal Reynolds stress and Reynolds shear stress budgets. The outer layer interacts with the inner layer through turbulent diffusion and the excess energy from the wall-normal direction is transferred to the spanwise direction. dc.publisher Cambridge University Press dc.title Direct numerical simulation of a wall jet: flowÂ physics en dc.type Article prism.endingPage 542 prism.publicationDate 2018 en prism.publicationName Journal of Fluid Mechanics en prism.startingPage 507 prism.volume 852 en dc.identifier.doi 10.17863/CAM.30823 dcterms.dateAccepted 2018-06-17 en rioxxterms.versionofrecord 10.1017/jfm.2018.503 en rioxxterms.licenseref.uri http://www.rioxx.net/licenses/all-rights-reserved en rioxxterms.licenseref.startdate 2018-10-10 en dc.contributor.orcid Tyacke, James [0000-0001-7220-7711] dc.contributor.orcid Tucker, Paul [0000-0002-0874-3269] dc.identifier.eissn 1469-7645 rioxxterms.type Journal Article/Review en rioxxterms.freetoread.startdate 2019-02-08
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