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DY: Fachverband Dynamik und Statistische Physik

DY 30: Posters II

DY 30.39: Poster

Thursday, March 25, 2010, 16:00–18:00, Poster C

Conditional velocity increment statistics in Lagrangian turbulence — •Daniel Schulz, Holger Homann, and Rainer Grauer — Institut für Theoretische Physik I, Ruhr-Universität Bochum, 44780 Bochum

The probability density functions(PDFs) and structure functions of velocity increments, conditioned to the local rate of energy dissipation, are analyzed via direct numerical simulations in the Eulerian frame of reference. As already observed in experiments, the conditioned PDFs are nearly Gaussian, thus intermittency is suppressed.

We transfer this ansatz to the Lagrangian framework and propose a new quantity for conditioning, since here the rate of energy dissipation seems not to be a suitable quantity.