dc.contributor.author | Sandham, James | |
dc.contributor.author | Waite, Michael L | |
dc.date.accessioned | 2016-05-30 16:19:39 (GMT) | |
dc.date.available | 2016-05-30 16:19:39 (GMT) | |
dc.date.issued | 2015-04 | |
dc.identifier.issn | 1468-5248 | |
dc.identifier.uri | http://dx.doi.org/10.1080/14685248.2015.1023986 | |
dc.identifier.uri | http://hdl.handle.net/10012/10524 | |
dc.description.abstract | Three-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.sponsorship | Natural Sciences and Engineering Research Council || RGPIN/386456-2015 | en |
dc.language.iso | en | en |
dc.publisher | Taylor and Francis | en |
dc.subject | atmospheric turbulence | en |
dc.subject | large-eddy simulation | en |
dc.subject | turbulent boundary layers | en |
dc.subject | turbulent convection | en |
dc.title | Spectral energy balance in dry convective boundary layers | en |
dc.type | Article | en |
dcterms.bibliographicCitation | J. Sandham and M. L. Waite. Spectral energy balance in dry convective boundary layers. J. Turbul. 16, 650-675, 2015 | en |
uws.contributor.affiliation1 | Faculty of Mathematics | en |
uws.contributor.affiliation2 | Applied Mathematics | en |
uws.typeOfResource | Text | en |
uws.peerReviewStatus | Reviewed | en |
uws.scholarLevel | Faculty | en |