Large Eddy Simulation (LES) is often viewed as the most efficient computational technique to study turbulent flows and helped researchers to have a better understanding of the complex phenomena. In the framework of COMTESSA, the LES model PALM (The Parallelized Large-Eddy Simulation Model) is used along with the eddy covariance measurement to simulate the atmospheric boundary layer flows.
As a first attempt, a set of high-resolution LES numerical experiments has been performed to investigate the characteristics of the scalar field dispersing from a localized small source. We performed simulations reproducing the dispersion from a continuous tracer release in a neutrally stratified boundary layer generated in a wind tunnel. An example is shown in the Figure below. It shows a snapshot of instantaneous scalar concentration in the xy plane at source elevation.