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• W2020870149 abstract "We perform a linear stability analysis to examine the onset of buoyancy-driven convection relevant to subsurface carbon dioxide sequestration in confined, porous Cartesian and cylindrical domains. Our work amends the analysis in an earlier study on cylindrical geometries. We consider Cartesian geometries where the aspect ratio between the two horizontal dimensions is not necessarily equal to one. Two key elements of the stability analysis are: (1) the critical time and (2) the critical wavenumber. Lateral boundaries have a much greater influence on the critical wavenumber than on the critical time. The confinement due to these boundaries impedes the onset of convection to the extent that convection cannot even occur in domains that are smaller than a certain size. Large aspect ratios can significantly reduce boundary effects. Patterns of the earliest-growing perturbation mode in the horizontal plane reveal many interesting dynamics which have not been examined in previous stability analyses. We illustrate several differences between patterns in Cartesian geometries and patterns in cylindrical geometries. Based on observations from earlier papers, we hypothesize that the contrasts between the Cartesian and cylindrical patterns may lead to significantly different behavior in the two geometries after the onset of convection. Our results may guide future numerical studies that can investigate this hypothesis and may help with understanding the onset of buoyancy-driven convection in real systems where lateral boundary effects are significant." @default.
• W2020870149 created "2016-06-24" @default.
• W2020870149 creator A5054639925 @default.
• W2020870149 creator A5062188169 @default.
• W2020870149 date "2013-04-01" @default.
• W2020870149 modified "2023-10-14" @default.
• W2020870149 title "Onset of buoyancy-driven convection in Cartesian and cylindrical geometries" @default.
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• W2020870149 doi "https://doi.org/10.1063/1.4801930" @default.
• W2020870149 hasPublicationYear "2013" @default.
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