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Turbulence Closures In Neutral Boundary Layer Over Complex Terrain
Authors:Silvia Trini Castelli  Enrico Ferrero  Dominico Anfossi
Affiliation:(1) Istituto di Cosmogeofisica del CNR, Torino, Italy;(2) Dipartimento di Scienze e Tecnologie Avanzate, Universitá del Piemonte Orientale, Alessandria, Italy
Abstract:In this work, three turbulence closure models, Mellor andYamada level 2.5, E - l and E - isin implemented in a circulation model, are compared in neutral condition over complex terrain. They are firstly applied to a one-dimensional case on flat terrain and then to a schematic two-dimensional valley. The simulation results, in terms of wind field and turbulent kinetic energy, are tested against measurements from a wind-tunnel experiment. The empirical constants defining the characteristic length scales of the closures are modified based on turbulence parameters estimated in the experiment. The formulation of the diffusion coefficients is analysed to explain the differences among the various closures in the simulation results. Regarding the mean flow, both on flat and complex terrain, all the closures yield satisfactory results. Concerning the turbulent kinetic energy, the best results are obtained by E - l and E - isin closures.
Keywords:Complex terrain  Neutral Boundary Layer  Turbulence closure  Wind-tunnel flow
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