内容简介：

Using the unique capabilities of the Variable Density Turbulence Tunnel (VDTT) in a classical grid turbulence experiment at the Max Planck Institute for Dynamics and Self-Organization, we were able to measure extremely long time series of up to 1010 samples of the turbulent fluctuating velocity, corresponding to O (105) large eddy turnover times in a well-controlled environment at a wide range of high Reynolds numbers from Rλ = 110 up to Rλ = 1600. These classical grid measurements were conducted using both classical hot-wire probes as well as NSTAP probes developed at Princeton University. With these long datasets, we were able to uncover fine details of the structure functions in the inertial range. We find that deviations from ideal scaling is anchored to the small scales and thus that dissipation might influence the inertial-range statistics well beyond even the near-dissipation range. I shall also present newest measurements in the VDTT with an active grid, where Rλ ≈ 7000 can be reached.

This work is in collaboration with Greg Bewley, Christian Küchler, and Michael Sinhuber.

报告人简介：

Prof. Eberhard Bodenschatz received his doctorate in theoretical physics from the University of Bayreuth in 1989. In 1991, during his postdoctoral research at the University of California at Santa Barbara, he received a faculty position in experimental physics at Cornell University. From 1992 until 2005, during his tenure at Cornell he was a visiting professor at the University of California at San Diego (1999-2000). In 2003 he became Director and Scientific Member at the Max Planck Institute for Dynamics and Self-Organization.

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