Wave number selection in the presence of noise : Experimental results

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http://hdl.handle.net/10138/240787

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Zhilenko , D , Krivonosova , O , Gritsevich , M & Read , P 2018 , ' Wave number selection in the presence of noise : Experimental results ' , Chaos , vol. 28 , no. 5 , 053110 . https://doi.org/10.1063/1.5011349

Title: Wave number selection in the presence of noise : Experimental results
Author: Zhilenko, Dmitry; Krivonosova, Olga; Gritsevich, Maria; Read, Peter
Contributor: University of Helsinki, Department of Physics
Date: 2018-05
Language: eng
Number of pages: 9
Belongs to series: Chaos
ISSN: 1054-1500
URI: http://hdl.handle.net/10138/240787
Abstract: In this study, we consider how the wave number selection in spherical Couette flow, in the transition to azimuthal waves after the first instability, occurs in the presence of noise. The outer sphere was held stationary, while the inner sphere rotational speed was increased linearly from a subcritical flow to a supercritical one. In a supercritical flow, one of two possible flow states, each with different azimuthal wave numbers, can appear depending upon the initial and final Reynolds numbers and the acceleration value. Noise perturbations were added by introducing small disturbances into the rotational speed signal. With an increasing noise amplitude, a change in the dominant wave number from m to m +/- 1was found to occur at the same initial and final Reynolds numbers and acceleration values. The flow velocity measurements were conducted by using laser Doppler anemometry. Using these results, the role of noise as well as the behaviour of the amplitudes of the competing modes in their stages of damping and growth were determined. Published by AIP Publishing.
Subject: SPHERICAL COUETTE-FLOW
TAYLOR-VORTEX FLOW
CONCENTRIC ROTATING SPHERES
INNER-SPHERE
MULTIPLICATIVE NOISE
INSTABILITIES
TRANSITION
ACCELERATION
COMPETITION
MODES
114 Physical sciences
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