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2013 Large Eddy Simulation of Unstably Stratified Turbulent Flow over Urban-Like Building Arrays
Bobin Wang, Guixiang Cui
J. Appl. Math. 2013: 1-10 (2013). DOI: 10.1155/2013/783187

Abstract

Thermal instability induced by solar radiation is the most common condition of urban atmosphere in daytime. Compared to researches under neutral conditions, only a few numerical works studied the unstable urban boundary layer and the effect of buoyancy force is unclear. In this paper, unstably stratified turbulent boundary layer flow over three-dimensional urban-like building arrays with ground heating is simulated. Large eddy simulation is applied to capture main turbulence structures and the effect of buoyancy force on turbulence can be investigated. Lagrangian dynamic subgrid scale model is used for complex flow together with a wall function, taking into account the large pressure gradient near buildings. The numerical model and method are verified with the results measured in wind tunnel experiment. The simulated results satisfy well with the experiment in mean velocity and temperature, as well as turbulent intensities. Mean flow structure inside canopy layer varies with thermal instability, while no large secondary vortex is observed. Turbulent intensities are enhanced, as buoyancy force contributes to the production of turbulent kinetic energy.

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Bobin Wang. Guixiang Cui. "Large Eddy Simulation of Unstably Stratified Turbulent Flow over Urban-Like Building Arrays." J. Appl. Math. 2013 1 - 10, 2013. https://doi.org/10.1155/2013/783187

Information

Published: 2013
First available in Project Euclid: 14 March 2014

zbMATH: 06950865
Digital Object Identifier: 10.1155/2013/783187

Rights: Copyright © 2013 Hindawi

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