Author(s)

Vu Thanh Ca

Abstract

A numerical model was developed for the computation of the wind field. air temperature and humidity in the urban canopy layer and in the atmo- spheric boundary layer above urban areas. The model is a k-e type. The ensemble-spatial averaged three-dimensional Reynolds equations, equation of continuity, turbulent kinetic energy (/^-equation), and turbulent energy dissipation equation (e-equation) are solved together with equations of heat and moisture transfer in the air. Inside the urban canopy layer, volumes of buildings and other urban structures are accounted for by a spatial averaging procedure. With given average building height and building width for each grid mesh, effects of buildings on the momentum transfer are modelled by introducing a form drag force. Temperatures of the ground surface, building walls or roof are computed b

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