Hostname: page-component-cd9895bd7-gbm5v Total loading time: 0 Render date: 2024-12-28T06:24:32.199Z Has data issue: false hasContentIssue false

The time-dependent motion due to a cylinder moving in an unbounded rotating or stratified fluid

Published online by Cambridge University Press:  28 March 2006

F. P. Bretherton
Affiliation:
Department of Applied Mathematics and Theoretical Physics, University of Cambridge

Abstract

A rigid cylinder is initially at relative rest in a uniformly rotating, inviscid, incompressible fluid, with its generators perpendicular to the axis of rotation. The fluid is accelerated suddenly to a small constant velocity parallel to the axis of rotation, which is maintained thereafter. The growth of the subsequent disturbance due to the cylinder is interpreted in terms of plane inertial waves, the disturbance energy propagating with the local group velocity, which is in the plane of the wave front and proportional to the wavelength. Taylor columns, in which the fluid moves with the cylinder rather than round it, grow indefinitely in both directions parallel to the rotation axis, the head of the column moving with finite speed.

In a slightly viscous fluid, an ultimate steady state is reached, in which the columns are of finite length.

If a cylinder is moved horizontally in a non-rotating uniformly stratified Boussinesq liquid, an identical analysis may be applied with a similar interpretation in terms of internal gravity waves rather than inertial waves.

Type
Research Article
Copyright
© 1967 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Chandrasekhar, S. 1961 Hydrodynamic and Hydromagnetic Stability, Oxford. 1st ed.
Childress, S. 1964 J. Fluid Mech. 20, 305.
Jacobs, S. J. 1964 J. Fluid Mech. 20, 581.
Jeffreys, H. & Jeffreys, B. S. 1956 Methods of Mathematical Physics, 3rd ed. Cambridge.
Long, R. R. 1953 J. Meteor, 10, 197.
Long, R. R. 1955 Tellus, 7, 341.
Phillips, O. M. 1966 Dynamics of the Upper Ocean. Cambridge.
Sarma, L. V. K. V. 1957 J. Fluid Mech. 3, 404.
Stewartson, K. 1952 Proc. Camb. Phil. Soc. 48, 168.
Stewartson, K. 1958 Quart. J. Mech. Appl. Math. 11.
Taylor, G. I. 1922 Proc. Roy. Soc. A, 102, 180.
Thustrrum, K. 1964 J. Fluid Mech. 19, 415.
Yih, C.-S. 1965 Dynamics of Nonhomogeneous Fluids, 1st ed. Macmillan.