F144 浮力乱流温度場境界層DNSデータによる乱流モデルの再構築(強制対流2)

Abstract

This paper presents reconstruction of turbulence heat transfer model using direct numerical simulation (DNS) data of thermal boundary layer with buoyancy. Since a buoyancy-affected boundary layer is often encountered in an urban environmental space where stable and/or unstable stratification exists, predicting a buoyancy-affected boundary layer is very important to improve the urban environment. On the other hand, reconstruction method using DNS data of a turbulence model, which is powerful tool for the prediction of heat transfer, has been reported by many researchers. A number of DNS data of channel flows are supplied, but DNS data of boundary layer have been hardly provided. Thus, in order to create DNS data of a buoyancy-affected boundary layer, we have carried out spatially-developing DNS of stratified stable/unstable boundary layer. The existing turbulence models are evaluated using the present DNS data, and an improvement points of turbulence model are found out.