Joint Seminar: LES and DNS research on droplet collisions in cloud turbulence

The Multiscale Simulation and Modeling Group at the Earth Simulator Center has developed a high-resolution atmosphere-ocean coupled model called "MSSG" (Multi-Scale Simulator for the Geoenvironment). In order to develop and validate the model's cloud simulations, the group is also developing Direct Numerical Simulations (DNS) of atmospheric turbulence containing inertial droplets. This strategy can be seen as analogous to the development of Large-Eddy Simulation (LES) models, where DNS of turbulence is used to develop parameterizations to account for the influence of unresolved scales.


I will start by introducing the MSSG model, including our warm-bin/cold-bulk hybrid cloud microphysical model. Then I will present our LES and DNS research targeting collisions of inertial droplets in cloud turbulence. The latter part discusses the classical issue of whether the enhanced collisions due to turbulence are responsible for quick rain formations. The talk will include some results for RICO model intercomparison experiment.




13:30 h


Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg


Ryo Onishi, JAMSTEC


Bjorn Stevens

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