In this paper, we report that reversals of large-scale circulation in two-dimensional Rayleigh–Benard convection could be suppressed or enhanced by imposing local constant-temperature control on sidewalls. When the control area is away from the centre of the sidewalls, the control can successfully eliminate the flow reversal if the size of the control region is large enough. With a proper location, the width can be as small as 1 % of the system size. When the control region is located around the centre, the control may enhance the flow reversal. It may also stimulate the occurrence of a double-roll mode when the control is located in the centre. Explanations are also discussed based on the twofold effects of the control region on the nearby plumes and the concept of symmetry. The present work provides a new way to control the flow reversals in Rayleigh–Benard convection through modifying sidewall boundary conditions.

中文翻译：

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控制二维 Rayleigh-Bénard 对流中的流动逆转

在本文中，我们报告了二维瑞利-贝纳德对流中大规模环流的逆转可以通过对侧壁施加局部恒温控制来抑制或增强。当控制区域远离侧壁中心时，如果控制区域的尺寸足够大，控制可以成功地消除逆流。如果位置合适，宽度可以小到系统尺寸的 1%。当控制区域位于中心附近时，控制可以增强流动逆转。当控件位于中心时，它也可能刺激双滚模式的发生。还基于控制区域对附近羽流和对称性概念的双重影响讨论了解释。