Abstract

A turbulent subfilter viscosity for Large Eddy Simulation (LES) based on the Taylor statisticaldiffusion theory is proposed. This viscosity is described in terms of a velocity varianceand a time scale, both associated to the inertial subrange. This new subfilter viscositycontains a cutoff wavenumber kc , presenting an identical form (differing by a constant)to the Heisenberg subfilter viscosity. Therefore, both subfilter viscosities are describedin terms of a sharp division between large and small wavenumbers of a turbulent flowand, henceforth, Taylor and Heisenberg subfilter viscosities are in agreement with thesharp Fourier filtering operation, frequently employed in LES models. Turbulent statisticsof different orders, generated from atmospheric boundary layer simulations employingboth Taylor and Heisenberg subfilter viscosities have been compared with observations andresults provided by other simulations. The comparison shows that the LES model utilizingthe approaches of Taylor and Heisenberg reproduces these turbulent statistics correctly indifferent vertical regions of a planetary convective boundary layer (CBL).

Autore Pugliese

• Rizza Umberto

Tutti gli autori

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

Titolo volume/Rivista

Physica. A

Anno di pubblicazione

2012

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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