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Multiplicity of Flow Regimes in Thin Fluid Layers in Rotating Annular Channels
Fluid Dynamics ( IF 1.0 ) Pub Date : 2021-06-17 , DOI: 10.1134/s0015462821040066
A. E. Gledzer , E. B. Gledzer , A. A. Khapaev , O. G. Chkhetiani

Abstract—

The possible existence of distinct regimes of barotropic circulation in closed annular channels at the same external parameters governing the flow dynamics is investigated both experimentally and numerically. Transitions between the regimes are realized by means of varying the value of the main parameter determining the velocity field energy (for example, the current controlling the Ampere force in the case of MHD generation of a velocity field) with subsequent reconstruction of the former parameter value. Depending on the channel rotation period or the configurations of magnet locations in the case of MHD generation or sources and sinks in numerical experiments the following results are possible. (1) The initial and final regimes differ quantitavely in the number of cyclonic or anticyclonic vortices generatted. (2) The number of vortex formations does not change but their localization in space, for example, the angular coordinates of their centers, varies. (3) After the change and reconstruction of the original value of the governing parameter the flow returns to the regime almost undistinguishable from the original regime. The flow patterns and the corresponding diagrams for laboratory experiments and numerical simulations based on shallow water equations are presented.



中文翻译:

旋转环形通道中薄流体层中流动机制的多样性

摘要-

在控制流动动力学的相同外部参数下,在封闭环形通道中可能存在不同的正压环流状态,这通过实验和数值进行了研究。通过改变确定速度场能量的主要参数的值(例如,在速度场的 MHD 生成的情况下控制安培力的电流)以及随后重建前一个参数值,来实现状态之间的转换. 根据通道旋转周期或 MHD 生成或数值实验中的源和汇的情况下的磁铁位置配置,以下结果是可能的。(1) 初始状态和最终状态在产生的气旋或反气旋涡旋数量上存在定量差异。(2) 涡旋形成的数量没有变化,但它们在空间中的定位,例如它们的中心的角坐标,会发生变化。 2. 涡旋形成的数量没有变化,但它们在空间中的定位,例如它们的中心的角坐标,会发生变化。 2。 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (3) 在控制参数的原始值改变和重建后,流量返回到与原始状态几乎没有区别的状态。介绍了基于浅水方程的实验室实验和数值模拟的流动模式和相应的图表。

更新日期:2021-06-18
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