Driving a chemistry transport model with a large-eddy simulation

We have interfaced an off-line chemistry-transport model (https://silam.fmi.fi) to the wind velocity fields obtained from PALM large-eddy simulation (LES) model. With the resulting setup the dispersion simulations with a deca-meter resolution become feasible with very moderate compute resources. As a proof of concept we demonstrate a few examples of the LES-driven dispersion simulations  made with an ordinary PC.                        

In the presentation we discuss the difference between the assumptions in the LES and regional air-quality models and indicate several approaches
to cope with them and to reduce the storage and IO requirements for such a setup. We show a  comparison of a simulated tracer dispersion in an urban environment made with native PALM transport scheme and with SILAM model driven by the same wind fields and discuss the differences between the transport schemes used in the models.