Seminário do Departamento de Ciências Atmosféricas: "The PALM Model System 6.0 An LES Code for Basic and Environmental Research – Capabilities and Recent Applications"

Resumo:  Originally applied to study convective atmospheric boundary layers (CBL), large-eddy simulation (LES) is meanwhile used in many fields of science. This is mainly the consequence of a massive increase in available computer resources. State-of-the-art massively parallel computers have opened the field for a wide variety of new applications. On these machines, simulations with extremely large numerical grids of up to 40003 grid points and even more are currently carried out in acceptable time. In Meteorology, beside for the fundamental research of neutral and stable stratified flows, where the typical eddy size is much smaller than for pure convectively driven flows, LES starts to be used also for more applied topics like air pollution modeling, flow around buildings, wind energy, or aircraft operation. The LES model PALM (PArallelized LES Model), originally developed at the Leibniz University Hannover (LUH), has become a community model over the last 10-15 years. Beside LUH, a team of national and international developers significantly extended the original code by a large amount of features, from cloud physics, chemistry, radiation, Lagrangian particles, up to various nesting capabilities. A strong focus is put on the explicit representation of detailed surface processes, e.g. resolved scale vegetation or complex structures of buildings. The talk will focus on applications of PALM. It will start with a short general introduction to atmospheric turbulence and LES, and will then present results from recent studies that have been carried out at IMUK, e.g. on urban ventilation, large wind farms, or dust release by dust devils.