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The origin of instability in enclosed horizontally driven convection

机译:封闭水平驱动对流中不稳定的起因

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We demonstrate that instability in enclosed horizontally driven convection is due to a convective buoyancy-driven transverse-roll instability resembling the classical Rayleigh-Benard convection in the thermal forcing boundary layer rather than a shear instability in the corresponding kinematic boundary layer. Instability growth is weakly sensitive to the local velocity profile, with velocity shear acting to select a transverse roll mode in preference to longitudinal rolls. The convectively unstable region grows from the hot end of the forcing boundary with increasing Rayleigh number two orders of magnitude lower than the natural onset of unstable horizontal convection. This analysis highlights the importance of the thermal boundary layer to the instability dynamics of horizontal convection, elucidating the path towards an understanding of turbulence and heat transport scaling in horizontal convection at oceanic Rayleigh numbers.
机译:我们证明了封闭水平驱动对流的不稳定性是由于对流浮力驱动的横滚不稳定性,类似于热强迫边界层中的经典瑞利-贝纳德对流,而不是相应运动学边界层中的剪切不稳定性。不稳定的增长对局部速度分布几乎不敏感,速度剪切作用优先于纵向滚动,以选择横向滚动模式。对流不稳定区域从强迫边界的热端开始生长,瑞利数的增加比不稳定水平对流的自然发作低两个数量级。该分析突出了热边界层对水平对流不稳定动力学的重要性,阐明了理解海洋瑞利数水平对流湍流和热传递尺度的途径。

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