Large Eddy Simulation (LES) of atmospheric turbulence

Large Eddy Simulation has been used to simulate wind and turbulence within complex geometrics in the atmosphere. The purpose is to study the possibilities to use LES for simulation of dispersion in an urban environment. The LES model i spresented with a simulation of channel flow without any obstacles where a number of sub grid models are compared at different Reynolds numbers. Flow around a cube is then presented comparing the results from the sub grid models with experimental data. The sub grid model MILES is then selected and used for a simulation of the flow over a geometry derived from Gamla Stan in Stockholm.