A Non-normal-Mode Marginal State of Convection in a Porous Rectangle
Journal article, Peer reviewed
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OriginalversjonTyvand, P. A., Nøland, J. K. & Storesletten, L. (2019). A Non-normal-Mode Marginal State of Convection in a Porous Rectangle. Transport in Porous Media, 128(2), 633-651. doi: 10.1007/s11242-019-01263-5
The fourth-order Darcy–Bénard eigenvalue problem for onset of thermal convection in a 2D rectangular porous box is investigated. The conventional type of solution has normal-mode dependency in at least one of the two spatial directions. The present eigenfunctions are of non-normal-mode type in both the horizontal and the vertical direction. A numerical solution is found by the finite element method, since no analytical method is known for this non-degenerate fourth-order eigenvalue problem. All four boundaries of the rectangle are impermeable. The thermal conditions are handpicked to be incompatible with normal modes: The lower boundary and the right-hand wall are heat conductors. The upper boundary has given heat flux. The left-hand wall is thermally insulating. The computed eigenfunctions have novel types of complicated cell structures, with intricate internal cell walls.