Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Poster I

DY 12.8: Poster

Dienstag, 24. März 2009, 14:30–16:30, P1A

Dynamics of turbulent structures in a Rayleigh-Bénard-system — •Michael Peters and Michael Langner — Uni Oldenburg, Deutschland

Abstract: Langevin analysis of a time series essentially serves to work out the underlying deterministic law of the stochastic dynamical system considered. This method is applied to a measured time series of a Rayleigh-Bénard convection experiment in the turbulent region. The experimental setup consists of a water-filled cylindrical vessel heated from below. At the Rayleigh number Ra=6.8×109 a roll convection is observed with stochastic reorientations of the roll axis. The time series refers to the measurement of the vertical velocity component at a given point near the cylinder wall. The analysis of the corresponding one-dimensional Langevin equation reveals a deterministic double-well potential.

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