Coupling of models

Coupling of urban climate models at different scales

We used a nesting approach to couple large-scale LES simulations of buoyant flows at the city scale with small-scale LES at neighborhood scale. Information of large scale LES is used as boundary conditions for small scale LES at neighborhood scale using a blending zone (Vonlanthen et al. 2016 and Vonlanthen 2015). As a case study, the local climate of ETHZ Hönggerberg Campus in Zurich was studied (Vonlanthen et al. 2017), using two nested domains, where the campus was assumed to be at an elevated temperature. The figures show flow structures at the two studied scales, where large as well as small buoyant flow features are being resolved.