Abstract
This paper presents a direct numerical simulation (DNS) of turbulent thermal boundary layers under strong stable stratification. Since a buoyancy-affected boundary layer is often encountered in an urban environmental space where stable and/or unstable stratification exists, exploring a buoyancy-affected boundary layer is very important to know the transport phenomena of the flow in an urban-space. Thus, in order to investigate a buoyancy-affected boundary layer, we have carried out spatially-developing DNS of a storongly-stratified stable boudary layer. In the DNS results, fundamental turbulent statistics of the storongly-stratified stable boudary layer are shown, and near-wall variation of turbulent quantities, which are difficult to obtain experimentally, are presented in detail, and then discussed. Especially in the results, pronounced counter-gradient diffusions are observed in the turbulent momentum and heat transfer, i.e., in the distributions of the Reynolds shear stress and the wall-normal turbulent heat-flux.
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