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 G01: Nonlinear Dynamics: Turbulence & Turbulent Transition
10:35 AM–12:32 PM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B201
Chair: Daniel Borrero, Willamette University
Abstract ID: BAPS.2018.DFD.G01.2
Abstract: G01.00002 : Generation and decay of turbulence in an abruptly stopped Taylor-Couette flow
10:48 AM–11:01 AM
Presenter:
Harminder Singh
(Université du Havre, Laboratoire des Ondes et Milieux Complex, 53 rue de prony, Le Havre - France)
Authors:
Harminder Singh
(Université du Havre, Laboratoire des Ondes et Milieux Complex, 53 rue de prony, Le Havre - France)
Arnaud Prigent
(Université du Havre, Laboratoire des Ondes et Milieux Complex, 53 rue de prony, Le Havre - France)
Innocent Mutabazi
(Université du Havre, Laboratoire des Ondes et Milieux Complex, 53 rue de prony, Le Havre - France)
This study presents an innovative approach towards the generation and decay of turbulence in the Taylor-Couette system. The cylinders were brought to an abrupt stoppage that generated turbulence in the system, which was initially in the laminar flow region. Two different experimental approaches, namely visualizations and stereo-PIV measurements, were used to better understand the presented phenomenon for three different configurations at multiple rotation rates but always starting in the laminar flow region: only external cylinder, co-rotation and counter-rotation. For only external cylinder rotation, the lowest threshold limit of outer Reynolds number was found to be Reo=693, which could be lowered with co- or counter-rotation to a minimal value of Reo=433 . Axial wave-number increased with increasing rotation rate, and decay time to achieve complete laminar state was found to be around 40 seconds irrespective of the initial rotation rate. On the other hand, if the initial state before abrupt stoppage was turbulent the turbulence decayed in the matter of few seconds. In contrast to the study of Verschoof et al. (2017), self-similar decay of turbulence was not observed.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.G01.2
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