DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf
ISBN Print: 978-1-56700-229-4
ISSN: 2377-2816
The Level-3 Mesoscale Turbulence Model for Air Circulation and Pollutant Dispersion in Cities
要約
A computational scheme for an improved level-3 closure turbulence model is proposed to simulate the wind field structure above the urbanized surface (city) in the atmospheric boundary layer (ABL), and its performance is examined. In the present model, two new ingredients are employed: 1) an updated expression for the pressure-strain correlation, 2) an updated expression for the pressure-temperature correlation. The turbulent momentum and scalar fluxes are determined by the full explicit algebraic expressions which are derived from the closed transport equations for turbulent fluxes and simplified using the weak-equilibrium assumption and symbolic algebra. Closure is achieved by solving the evolution equations for the turbulent kinetic energy, its dissipation rate and scalar variance (the three-parametric turbulence model). This improved mesoscale model is able to reproduce the most important features of a wind field above the city.