Turbulence modeling in tie atmospheric boundary layer: a review and some recent developments

摘要

Wind flow and pollutant dispersion are the main two points of interest that make the prediction of the atmospheric flow a necessity for the modern society. Atmospheric problems are an important CFD application field and have repeatedly boosted CFD development. CFD-LES methodology is more attractive to local scale problems and neutral flows. CFD-RANS methodology is the main tool used today for practical problems. The problem of turbulence closure scheme selection for CFD-RANS applications is still an open question in atmospheric flows. For local scale problems the two equation turbulence modelling approach is the dominant one and especially the standard k-ε model. In the literature one can find simpler models (empirical, one equation models) or higher models as well as Reynolds stress models. Recently, the k-ε model has been re-examined and a new general approach in developing two-equation turbulence models is proposed with the aim of improving their reliability and consequently their range of applicability. The results up to now are quite encouraging.