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Numerical study of atmospheric diurnal penetrative convection over terrain with localized heat source

DOI: 10.1615/ICHMT.2015.THMT-15.1500
pages 679-682

Michael Yu. Hrebtov
Institute of Thermophysics of SB RAS,Ac. Lavrentieva ave. 1, Novosibirsk, Russian Federation, 630090; Novosibirsk State University, Pirogova st., 2, Novosibirsk, Russian Federation, 630090

K. Hanjalic
Department of Multi-scale Physics, Faculty of Applied Sciences, Delft University of Technology, The Netherlands and Novosibirsk State University, Russia

Sasa Kenjeres
Transport Phenomena Section, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology and J.M. Burgerscentrum for Fluid Mechanics, Delft, The Netherlands

Résumé

We present a numerical simulation of penetrative convection of weakly stratified atmospheric boundary layer over a urban terrain with a strong localized source of heat and moisture. The case mimics the real environment of Krasnoyarsk region (Russia) where the non-freezing river Yenisei acts as a source of heat and moisture during winter. We simulated a full diurnal cycle using a three-equation algebraic-flux model in a transient URANS approach, and novel buoyancy-accounting wall functions for the ground. The results show significant effect of the river on the net temperature and moisture distribution. The flow of the river disturbs the formation of thermal plumes by creating a shear at the water surface. The localized moisture source leads to a strong non-uniformity of humidity concentration in the air. The simulations cover rare natural phenomena and show the capability of the URANS turbulence model to capture the main features of flow and scalar fields.

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