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Topographic Instability of Flow in a Rotating Fluid : Volume 13, Issue 2 (21/06/2006)

By Patarashvili, K. I.

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Book Id: WPLBN0004019758
Format Type: PDF Article :
File Size: Pages 5
Reproduction Date: 2015

Title: Topographic Instability of Flow in a Rotating Fluid : Volume 13, Issue 2 (21/06/2006)  
Author: Patarashvili, K. I.
Volume: Vol. 13, Issue 2
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2006
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Kakhiani, V. O., Patarashvili, K. I., Tsakadze, Z. J., Kalashnik, M. V., Nanobashvili, J. I., Chanishvili, R. J., & Zhvania, M. A. (2006). Topographic Instability of Flow in a Rotating Fluid : Volume 13, Issue 2 (21/06/2006). Retrieved from http://www.ebooklibrary.org/


Description
Description: E. Andronikashvili Institute of Physics, 6 Tamarashvili str.,Tbilisi 0171, Georgia. Here are presented the results of experimental and theoretical studies on a stability of zonal geostrophic flows in the rotating layer of the shallow water. In the experiments, a special apparatus by Abastumani Astrophysical Observatory Georgian Academy of Science was used. This apparatus represents a paraboloid of rotation, which can be set in a regulable rotation around the vertical axis. Maximal diameter of the paraboloid is 1.2 m, radius of curvature in the pole is 0.698 m. In the paraboloid, water spreads on walls as a layer uniform on height under the period of rotation 1.677 s. Against a background of the rotating fluid, the zonal flows are formed by the source-sink system. It consists of two concentric circular perforations on the paraboloid bottom (width is 0.3 cm, radiuses are 8.4 and 57.3 cm, respectively); water can be pumped through them with various velocities and in all directions. It has been established that under constant vertical depth of the rotating fluid the zonal flows are stable. There are given the measurements of the radial profiles for the water level and velocity in the stationary regime. It has been found that zonal flows may lose stability under the presence of the radial gradient of full depth formed by a change of angular velocity of paraboloid rotation. An instability origin results in the loss of flow axial symmetry and in the appearance of self-excited oscillations in the zonal flow. At the given angular velocity of rotation, instability is observed only in the definite range of intensities of the source-sink system. The theoretical estimations are performed in the framework of the equations of the shallow water theory, including the terms describing the bottom friction. It has been shown that the instability of zonal flows found experimentally has a topographical nature and is related with non-monotone dependence of the potential vorticity on radius.

Summary
Topographic instability of flow in a rotating fluid

Excerpt
Danilov, S. D. and Sazonov, I. A.: Calculation of a zonal source-sink flow in a rotating basin, Izv. Acad. Sci. Russia, Atmos. Ocean. Phys., 35, 344–355, 1999.; Dikii, L. A.: Hydrodynamic stability and dynamics of the atmosphere, Gidrometeoizdat, Leningrad, 1976.; Doljanski, F. V., Krimov, V. A., and Manin, D. U.: A stability and vortex structure of quasi-dimensional shear flows, Sov.Phys. Uspekhi, 160, 1–47, 1990.; Nezlin, M. V. and Snejkin, E. N.: Rossby vortices and spiral structure, Nauka, Moscow, 1990.; Pedlosky, J.: Geophysical fluid dynamics, Springer-Verlag, Berlin–Heidelberg–New-York, 1982.; Zhvania, M. A., Kalashnik, M. V., Kakhiani, V. O., Nanobashvili, J. I., Patarashvili, K. I., and Tsakadze, Z. J.: Formation of azimuthal flows created by the source-sink system in the rotating paraboloid, Izvestia RAN. Fluid Mechanics, 2, 60–74, 2006.

 

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