Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session F38: DNS and LES
8:00 AM–10:10 AM,
Monday, November 19, 2018
Georgia World Congress Center
Room: Ballroom 1/2
Chair: Johan Larsson, University of Maryland, College Park
Abstract ID: BAPS.2018.DFD.F38.3
Abstract: F38.00003 : How turbulence is generated from zero—and the interscale dynamics in stationary state
8:26 AM–8:39 AM
Presenter:
Sualeh Khurshid
(Texas A&M Univ)
Authors:
Sualeh Khurshid
(Texas A&M Univ)
Diego A. Donzis
(Texas A&M Univ)
Katepalli R. Sreenivasan
(New York Univ)
wavenumbers occurs after a time lag of the order of a large-eddy time scale, qualitatively consistent with the cascade picture. However, it appears that part of the energy leaks to dissipative wavenumbers as an instantaneous reaction to forcing. Once in a steady sate, while Gaussian statistics are observed for temporal fluctuations in the inertial range consistent with the fluctuations in forcing, increasingly skewed probability density functions emerge at higher wavenumbers. In particular, fluctuations from the mean in the far-dissipation range, defined here as wavenumbers larger than twice the mean Kolmogorov wavenumber, are very large.
Different transfer models to predict the observed behavior are discussed.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.F38.3
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