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 L34: Geophysical Fluid Dynamics: Rotating Flows
4:05 PM–6:41 PM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B406
Chair: Philip Marcus, University of California, Berkeley
Abstract ID: BAPS.2018.DFD.L34.6
Abstract: L34.00006 : Genesis of Taylor–Couette flow instabilities
5:10 PM–5:23 PM
Presenter:
H. Oualli
(Ecole Militaire Polytechnique, Algiers, Algeria)
Authors:
H. Oualli
(Ecole Militaire Polytechnique, Algiers, Algeria)
M. Mekadem
(Ecole Militaire Polytechnique, Algiers, Algeria)
M. Khirennas
(Ecole Militaire Polytechnique, Algiers, Algeria)
Y. Rezga
(Ecole Militaire Polytechnique, Algiers, Algeria, Ecole Militaire Polytechnique, Algiers, Algeria)
S. Tebtab
(Ecole Militaire Polytechnique, Algiers, Algeria)
T. Azzam
(Ecole Militaire Polytechnique, Algiers, Algeria)
A. Bouabdallah
(Universite des Sciences et de la Technologie Houari Boumediene, Algiers, Algeria)
M. Gad-el-Hak
(Virginia Commonwealth University)
Numerical simulations are conducted of a Taylor–Couette flow from early structuring stages to completion of the Taylor’s axial stationary waves. We seek to elucidate the underlying mechanisms responsible for the genesis of this flow type and to identify the intermediate embryonic stages up to the birth and completion of the Taylor’s axial stationary vortices. A 3D numerical simulations of liquid benzene are implemented on FLUENT. The calculations are based on the finite-volume method with a mesh size of 32X28X256 in, respectively, the radial, azimuthal, and axial directions. The simulations are validated using prior experimental results. The calculations span Taylor numbers from Ta=E-9 to Ta=43.8. The results show that the incipient pressure variations are of the order of E-12 Pa, detected at Ta=E-9, on four symmetrically separated cardinal points within the system. When Ta>E-9, a progressive propagation of alternating overpressure and depression zones operate in both azimuthal directions. This is the first step in the chain of mechanisms responsible for the Taylor’s wave building process. The study reports, for the first time, all the details to explain the instability mechanisms’ evolution.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.L34.6
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