Modeling of flow and dispersion characteristics in typical urban building configurations with the fast-response model QUIC

The fast response model QUIC is designed to generate high resolution, 3-dimensional wind and dispersion fields for urban areas. It is based on a diagnostic wind field model, QUIC-URB, and a Lagrangian dispersion model, QUIC-PLUME. QUIC-URB uses empirical flow parameterizations to generate an initial flow field near buildings. The final velocity field is then obtained by forcing the initial velocity field to be mass consistent, and resembles a time-averaged experimental result. The paper presents an evaluation of QUIC predictions against high resolution wind-tunnel data sets of flow and dispersion characteristics in street canyons and near intersections. It will be shown, that simple modifications of the street –canyon initialization scheme result in significant improvements of the flow and dispersion predictions. Additionally, the implementation of a traffic-produced turbulence (TPT) scheme into QUIC will be outlined and first results of QUIC simulations accounting for TPT will be discussed.