Turbulent Length Scale for Multilayer RANS Model of Urban Canopy and Its Evaluation Based on Large-Eddy Simulations

Andrey V. Glazunov; Andrey V. Debolskiy; Evgeny V. Mortikov

doi:10.14529/jsfi210409

Authors

Andrey V. Glazunov G.I. Marchuk Institute of Numerical Mathematics, Russian Academy of Science
Andrey V. Debolskiy Lomonosov Moscow State University
Evgeny V. Mortikov Lomonosov Moscow State University https://orcid.org/0000-0002-9683-5701

DOI:

https://doi.org/10.14529/jsfi210409

Keywords:

atmospheric boundary layer, numerical simulation of turbulence, urban canopy, scalar turbulent transport

Abstract

Large-Eddy Simulation (LES) numerical experiments of neutrally-stratified turbulent flow over an urban-type surface and passive scalar transport by this flow are performed. A simple parameterization of the turbulent length scale containing only one empirical constant is proposed. Multilayer Reynolds-Averaged Navier-Stokes (RANS) model of turbulent flow and turbulent scalar diffusion is constructed. The results of the RANS model are compared with the LES experiments. It is shown that the proposed approach allows predicting the average flow velocity and the scalar concentration inside and above the urban canopy.

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