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DY: Dynamik und Statistische Physik

DY 14: Complex Fluids

DY 14.6: Talk

Friday, March 4, 2005, 16:45–17:00, TU H3010

Stretching of polymers on sub-Kolmogorov scales in a turbulent flow — •Jörg Schumacher — Fachbereich Physik, Philipps-Universität Marburg, 35032 Marburg

We study the stretching behaviour of polymers on scales below the viscous Kolmogorov scale in a turbulent flow. Brownian dynamics simulations of an ensemble of dumbells are combined with direct numerical simulations of Navier-Stokes turbulence that resolve sub-Kolmogorov scales very well. The role of extreme stretching events on the overall statistics is discussed. Our results are compared with recent measurements in so-called von Karman swirling flows.