Numerical analysis of double-diffusive convection in a porous enclosure due to opposing heat and mass fluxes on the vertical walls - Why does peculiar oscillation occur?

金沢大学環日本海域環境研究センターエコテクノロジー研究部門Peculiar oscillating convection is observed when two-dimensional double-diffusive convection in porous medium is analysed numerically. The top and bottom walls of an enclosure are insulated, and constant and opposing heat and mass fluxes are prescribed on the vertical walls. The peculiar oscillations are of three types: (1) Chaotic oscillations wherein the main flow is due to temperature; however, the convection due to concentration is strong enough to generate this peculiar oscillation. (2) The \u27sudden steady state case\u27 caused by the shifts from thermally-driven to concentration-driven forces. (3) The \u27re-oscillation case\u27 caused by the convection pattern changes from centrosymmetric to non-centrosymmetric.. © 2007 Elsevier Ltd. All rights reserved