Linear spin-up in a sliced cylinder
作者:
J.A. Van De Konijnenberg,
V. Naulin,
J.Juul Rasmussen,
B. Stenum,
G.J. F. Van Heijst,
期刊:
Geophysical & Astrophysical Fluid Dynamics
(Taylor Available online 2000)
卷期:
Volume 92,
issue 1-2
页码: 85-114
ISSN:0309-1929
年代: 2000
DOI:10.1080/03091920008203712
出版商: Taylor & Francis Group
关键词: Spin-up;β-plane;sliced cylinder
数据来源: Taylor
摘要:
spin-up and spin-down in a circular tank with a uniformly sloping bottom are studied experimentally and numerically for small values of the relative change in the angular velocity of the tank. Generally, the initial single-cell flow evolves into a number of smaller vortices. The evolution is compared with an analytical model based on an expansion of the flow field in linear Rossby waves (Pedlosky and Greenspan, 1967). Although it is possible to tune the experimental parameters in such a way that agreement with the theory is found, in most cases the experiments show shedding of vortices in the initial stage of the spin-up or spin-down, a phenomenon not described by the analytical model. Nonetheless, in such cases the analytical model still accounts for other observations: the alternating generation of cyclonic and anticyclonic vortices in the eastern part of the tank and their subsequent westward motion.
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