Reliability of third-order moment parameterization for models of turbulent boundary layer over gentle topography

Maurizi, A. and Trombetti, F. and Di Sabatino, S. and Tampieri, F. (1997) Reliability of third-order moment parameterization for models of turbulent boundary layer over gentle topography. Il nuovo cimento C, 20 C (3). pp. 273-286. ISSN 1826-9885


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An analysis is made of the transport equation of Reynolds shear stress, written in a streamline coordinate system, starting from the fields of first- and secondorder moments of wind velocity, measured in a terrain-following system over gentle topography, in order to verify the usual parameterizations of third-order moments. The equation is split into two parts: the first contains the terms which can be calculated directly from measurements, the second involves the pressure-velocity correlation considering the terms of rapid distortion, curvature and return to isotropy and the transport of triple velocity-correlation modelled assuming a flux-gradient approximation. Moreover, the error estimates associated with both parts have been computed using a Monte Carlo technique which takes into account the experimental errors. This analysis is performed on wind tunnel data over a gently shaped two-dimensional valley and hill. The comparison between the measured and modelled parts is good near the surface, whereas, at higher levels, where the pertubations induced by the topography are significant, there are large zones generally characterized by streamlines with concave curvature in which the flux-gradient approximation used to compute the triple product correlation cannot be applied.

Item Type: Article
Uncontrolled Keywords: Boundary layer structure and processes; convection, turbulence and diffusion; meteorology; turbulence and diffusion; conference proceedings
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia > 551.5 Meteorologia (Classificare qui l'atmosfera) (Classificare la previsione e le previsioni di specifici fenomeni meteorologici in 551.64; classificare la Micrometeorologia in 551.66)
Depositing User: Marina Spanti
Date Deposited: 11 May 2017 08:36
Last Modified: 11 May 2017 08:36

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