Berlin 2012 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 16: Fluid dynamics and turbulence II

DY 16.5: Vortrag

Mittwoch, 28. März 2012, 11:15–11:30, MA 144

Modeling of bacterial turbulence — •Sebastian Heidenreich1, Henricus H. Wensink2, Knut Drescher3, and Jörn Dunkel31Physikalisch Technische Bundesanstalt Berlin, Germany — 2Heinrich-Heine-Universität Düseldorf, Germany — 3University of Cambridge, UK

From large scale atmospheric plasma instabilities to small scale bacterial turbulence, irregular flow motion appears in very different fluid systems. The investigation of system independent universal properties give a deep insight into the character of turbulence. In particular, the study of bacterial turbulence may lead to a better understanding of both the collective behavior of active soft matter and universal properties of turbulence. In the presentation, for the description of self-sustained bacterial turbulence continuum equations are introduced and numerical solutions are discussed. For the characterization of turbulence statistical quantities as structure functions, energy scalings and velocity distributions are derived. The results are in a good agreement with experimental data of bacillus subtilis and self-propelled hard rods molecular dynamics simulations.

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