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dc.contributor.authorSandham, James
dc.contributor.authorWaite, Michael L 16:19:39 (GMT) 16:19:39 (GMT)
dc.description.abstractThree-dimensional large-eddy simulations (LES) of the convective boundary layer over a domain of approximately 6 km are performed with the UCLA LES model. Simulations are forced with a constant surface heat flux and prescribed subsidence, and are run to equilibrium. Sub-grid scale fluxes are parameterised with the Smagorinsky–Lilly scheme. A range of grid spacings from 40 down to 5 m are employed. Kinetic energy spectra and the various terms in the kinetic energy spectral budget – heat flux, nonlinear transfer, pressure, and dissipation – are computed using two-dimensional discrete Fourier transforms at every vertical level. Despite the fact that isotropic grid spacings of down to 5 m (grid sizes of 11522×400) were used, an inertial range with a −5/3 spectrum is not obtained. Rather, shallower energy spectral slopes that are closer to −4/3 are found. The shallower spectra are shown to possibly result from the injection of kinetic energy over a wide range of scales via a very broad heat flux spectrum. Only with the highest resolution (Δx = 5 m) does the total heat flux begin to converge and the possibility of local isotropy emerge at small scales. Dependence on surface heat flux and domain size is considered. Preliminary sub-grid scale sensitivity results are obtained through comparison with the turbulent kinetic energy sub-grid scale model.en
dc.description.sponsorshipNatural Sciences and Engineering Research Council || RGPIN/386456-2015en
dc.publisherTaylor and Francisen
dc.subjectatmospheric turbulenceen
dc.subjectlarge-eddy simulationen
dc.subjectturbulent boundary layersen
dc.subjectturbulent convectionen
dc.titleSpectral energy balance in dry convective boundary layersen
dcterms.bibliographicCitationJ. Sandham and M. L. Waite. Spectral energy balance in dry convective boundary layers. J. Turbul. 16, 650-675, 2015en
uws.contributor.affiliation1Faculty of Mathematicsen
uws.contributor.affiliation2Applied Mathematicsen

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