Abstract

In this work a parametrization for the transport terms of the turbulent kinetic energy (TKE)budget equation, valid for a convective boundary layer (CBL) is presented. This is a hard taskto accomplish from experimental data, especially because of the difficulty associated to themeasurements of pressure turbulent fluctuations, which are necessary to determine thepressure correlation TKE transport term. Thus, employing a large eddy simulation (LES) afull diurnal planetary boundary layer (PBL) cycle was simulated. In this simulation a forcingobtained from experimental data is used, so that the numerical experiment represents amore realistic case than a stationary PBL. For this study all terms of the TKE budget equationwere determined for a CBL. From these data, polynomials that describe the TKE transportterms' vertical profiles were adjusted. The polynomials found are a good description ofthe LES data, and from them it is shown that a simple formulation that directly relatesthe transport terms to the TKE magnitude has advantages on other parameterizationscommonly used in CBL numerical models. Furthermore, the present study shows that theTKE turbulent transport term dominates over the TKE transport by pressure perturbationsand that for most of the CBL these two terms have opposite signs.

Autore Pugliese

• Rizza Umberto

Tutti gli autori

• F.S. Puhales; U. Rizza; G.A. Degrazia;O.C. Acevedo

Titolo volume/Rivista

Physica. A

Anno di pubblicazione

2013

ISSN

0378-4371

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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