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The linear vortex instability of the near-vertical line source plume in porous media

journal contribution
posted on 2023-05-18, 15:49 authored by Rees, DAS, Postelnicu, A, Andrew BassomAndrew Bassom
Free convection plumes usually rise vertically, but do not do so when in an asymmetrical environment. In such cases they are susceptible to a thermoconvective instability because warmer fluid lies below cooler fluid in the upper half of the plume. We analyse the behaviour of streamwise vortex disturbances in plumes that are close to being vertical. The linearised equations subject to the boundary layer approximation are parabolic and are solved using a marching method. Our computations indicate that disturbances tend to be centred in the upper half of the plume. A neutral curve is determined and an asymptotic theory is developed to describe the right hand branch of this curve. The left hand branch is not amenable to an asymptotic analysis, and it is found that the onset of convection for small wavenumbers is very sensitively dependent on both the profile of the initiating disturbance and where it is introduced.

History

Publication title

Transport in Porous Media

Volume

74

Pagination

221-238

ISSN

0169-3913

Department/School

School of Natural Sciences

Publisher

Kluwer Academic Publ

Place of publication

Van Godewijckstraat 30, Dordrecht, Netherlands, 3311 Gz

Rights statement

Copyright Springer Science+Business Media B.V

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the mathematical sciences

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