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Munro, R.J.; Foster, M.R. (2016)
Publisher: Cambridge University Press
Languages: English
Types: Article
Subjects:

Classified by OpenAIRE into

arxiv: Physics::Fluid Dynamics
A linearly stratified fluid contained in a circular cylinder with a linearly-sloped base, whose axis is aligned with the rotation axis, is spun up from a rotation rate Ώ to Ώ + ΔΏ (with ΔΏ << Ώ ) by Rossby waves propagating across the container. Experimental results presented here, however, show that if the Burger number S is not small, then that spinup looks quite different from that reported by Pedlosky & Greenspan [J. Fluid Mech., vol. 27, 1967, pp. 291–304] for S = 0. That is particularly so if the Burger number is large, since the Rossby waves are then confined to a region of height S−1/2 above the sloped base. Axial vortices, ubiquitous features even at tiny Rossby numbers of spin-up in containers with vertical corners (see van Heijst et al. [Phys. Fluids A, vol. 2, 1990, pp. 150–159] and Munro & Foster [Phys. Fluids, vol. 26, 2014, article no. 026603], for example), are less prominent here, forming at locations that are not obvious a priori, but in the ‘western half’ of the container only, and confined to the bottom S−1/2 region. Both decay rates from friction at top and bottom walls and the propagation speed of the waves are found to increase with S as well. An asymptotic theory for Rossby numbers that are not too large shows good agreement with many features seen in the experiments. The full frequency spectrum and decay rates for these waves are discussed, again for large S, and vertical vortices are found to occur only for Rossby numbers comparable to E1/2, where E is the Ekman number. Symmetry anomalies in the observations are determined by analysis to be due to second-order corrections to the lower-wall boundary condition.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • So, if Λ is purely real, assume that it is positive. In that case, ∞ ∞ X 1 < 1 X 1 = 1 m=1 α2m0(Λ + 12 αm0) Λ m=1 α2m0 4Λ 1
    • α3m0 .
    • Greenspan, H. P. 1968 The Theory of Rotating Fluids. Cambridge University Press.
    • Greenspan, H. P. & Howard, L. N. 1963 On a time-dependent motion of a rotating fluid. J. Fluid Mech. 17, 385-404.
    • Munk, W. H. & Carrier, G. F. 1950 The wind-driven circulation in ocean basins of various shapes. Tellus 2, 158-167.
    • Munro, R. J. & Foster, M.R. 2014 Stratified spin-up in a sliced, square cylinder. Phys. Fluids. 26, 026603.
    • Munro, R. J., Foster, M. R. & Davies, P. A. 2010 Instabilities in the spin-up of a rotating, stratified fluid. Phys. Fluids 22, 054108.
    • Munro, R. J., Hewitt, R. E. & Foster, M. R. 2015 On the formation of axial corner vortices during spin-up in a cylinder of square cross section. J. Fluid Mech. 772, 246-271.
    • Pedlosky, J. 1965 A study of the time-dependent ocean circulation. J. Atmos. Sci. 22, 267-272.
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    • van Heijst, G. J. F. 1989 Spin-up phenomena in non-axisymmetric containers. J. Fluid Mech. 206, 171-191.
    • van Heijst, G. J. F., Davies, P. A. & Davis, R. G. 1990 Spin-up in a rectangular container. Phys. Fluids A 2, 150-159.
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    • Wedemeyer, E. H. 1964 The unsteady flow within a spinning cylinder. J. Fluid Mech. 20, 383-399.
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