Berlin 2015 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 32: Focus Session: Statistics of fully developed turbulence

DY 32.11: Vortrag

Mittwoch, 18. März 2015, 18:15–18:30, BH-N 243

Describing the heat transport of turbulent Rayleigh-Bénard convection by POD methods — •Johannes Lülff — WWU Münster

Rayleigh-Bénard convection, which is the buoyancy-induced movement of a fluid enclosed between two horizontal plates, is an idealized setup to study thermal convection. We analyze the modes that transport the most heat between the plates by calculating the proper orthogonal decomposition (POD) of numerical data. Instead of the usual POD ansatz of finding modes that describe the energy best, we developed a method that is optimal in describing the heat transport. Thereby, we can determine the modes with the major influence on the heat transport and the coherent structures in the convection cell. We also show that in lower-dimensional projections of numerical convection data, the new developed modes perform consistently better than the standard modes.