Journal
TRANSPORT IN POROUS MEDIA
Volume 77, Issue 2, Pages 187-205Publisher
SPRINGER
DOI: 10.1007/s11242-008-9324-7
Keywords
Free convection; Nonuniform permeability; Linear stability theory; Floquet theory; Multiple scales theory
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The onset of convection in a horizontal porous layer is investigated theoretically. The permeability of the porous medium is a continuous periodic function of the horizontal x coordinate. Floquet theory has been employed to determine the favoured two-dimensional mode of convection. For a wide range of periods of the permeability variation, a matrix eigenvalue technique with eighth order accuracy has been employed to find the critical Darcy- Rayleigh number. This is supplemented by a multiple-scales analysis of the large-period limit, and a brief consideration of the anisotropic limit for very short periods.
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