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DY: Dynamik und Statistische Physik

DY 40: Lyapunov Instability of Many-Body Systems

DY 40.3: Vortrag

Donnerstag, 11. März 2004, 10:15–10:30, H2

Examination of Taylor hypothesis — •Stephan Barth, Stephan Lueck, and Joachim Peinke — University of Oldenburg

In open flows Taylor-hypothesis is commonly used to investigate small scale turbulence. The Taylor-hypothesis enables transfering temporal measurements with a localized probe to spatial structures of turbulence. Here we examine the validity of the Taylor-hypothesis in a turbulent wake flow. By means of two X-hotwire-probes positioned transversal to the mean flow and a LDA positioned in flow direction in front of one hotwire-probe measurements are performed. The Taylor-hypothesis was verified on the basis of the statistics of small scale turbulence including intermittency effects. The statistics of the longitudinal and the transversal velocity increments obtained by Taylor-hypothesis and by direct measurements at two points in the flow are compared.