Turbulent circulation above the surface heat source in a stably stratified environment
A.F. Kurbatskii1 and L.I. Kurbatskaya2
1Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
2Institute of Computational Mathematics and Mathematical Geophysics SB RAS, Novosibirsk, Russia
E-mail: kurbat@itam.nsc.ru
Keywords: turbulence, planetary boundary layer, urban heat island, large-scale circulation, numerical modeling
Pages: 677–692
Abstract
The results of the numerical modeling of turbulent structure of the penetrating convection above the urban heat island with a small aspect ratio in a stably stratified medium at rest are presented. The gradient diffusion representations for turbulent momentum and heat fluxes are used, which depend on three parameters - the turbulence kinetic energy, the velocity of its spectral expenditure, and the dispersion of temperature fluctuations. These parameters are found from the closed differential equations of balance in the RANS approach of turbulence description. The distri-butions of averaged velocity and temperature fields as well as turbulent characteristics agree well with measurement data.
DOI: 10.1134/S0869864316050061
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