15th European Turbulence Conference 2015
August 25-28th, 2015, Delft, The Netherlands

Invited speakers:

Prof. Marc Brachet. Ecole Normale Superieure, Paris, France

Prof. Peter G. Frick, Institute of Continuous Media Mechanics, Perm, Russia

Prof. Bettina Frohnapfel,  Karlsruher Institut fur Technology, Germany

Prof. Andrea Mazzino, Dipartimento di Fisica, University of Genova, Italy

Prof. Bernhard Mehlig. Department of Physics, University of Gothenburg, Sweden

Prof. Lex Smits, Mechanical and Aerospace Engineering, Princeton University, USA

Prof. Chao Sun Physics of Fluids, University of Twente, The Netherlands

Prof. Steve Tobias, Applied Mathematics, University of Leeds, United Kingdom

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09:00   Invited lecture by Prof. A.J. Smits, "Spectral scaling in very high Reynolds number wall-bounded flows"
Chair: Detlef Lohse
60 mins
Alexander Smits
Abstract: We present measurements of one-dimensional spectra in pipe and boundary layer flows at Reynolds numbers up to Re =72500. The results indicate that in the inertial region the spectra follow closely a k􀀀3=2 dependence rather than the expected k􀀀5=3. Inthe energy-containing range, an approximate region of k􀀀1 variation is seen to emerge at very high Reynolds numbers, connected with the appearance of the log-law for the streamwise turbulence intensity, but it is not an overlap region in the sense of [13]. The location of the outer spectral peak displays only a weak dependence on Reynolds number. The k􀀀1 x region seems to occur when there is sufficient scale separation between the locations of the outer spectral peak and the outer edge of the log region. The extent of k􀀀1 x region depends on the wavelength of the outer spectral peak, which appears to emerge as a new length scale for the log region.