Convective Transport Around a Rotating Square Cylinder at Moderate Reynolds Numbers
Convective Transport Around a Rotating Square Cylinder at Moderate Reynolds Numbers
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DOI：
10.1080/10407782.2014.965077
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发表时间：
2015-02
期刊：
影响因子：
--
通讯作者：
D. Chatterjee;S. Gupta
中科院分区：
文献类型：
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作者：
D. Chatterjee;S. Gupta
进行二维数值模拟来分析无约束介质中旋转方形圆柱体周围的热流体传输。对流传输起源于均匀自由流与由于锐边体旋转而演变的流之间相互作用的结果。基于有限体积的方法和贴体网格系统以及移动边界用于获得不可压缩纳维-斯托克斯和能量方程的数值解。基于自由流的雷诺数被认为在 10 ≤ Re ≤ 200 的范围内，并且圆柱体的无因次转速保持为 0 ≤ Ω ≤ 5。根据雷诺数和圆柱体的转速，传输特性会发生变化。对于 10 ≤ Re < 50 的范围，无论转速如何，流量都保持稳定。在 50 ≤ Re ≤ 200 范围内，在达到临界旋转速率 (Ωcr ) 时观察到规则的低频卡门涡旋脱落 (VS)。超过 Ωcr 后，全球对流传输表现出稳定的性质。旋转圆柱体在某个临界转速下也同样显示出 Kármán VS 的退化。然而，传热行为随着旋转的圆柱体而显着变化。这种在无约束自由流中围绕旋转方块的热流体传输是首次报道。
Two-dimensional numerical simulation is performed to analyze the thermofluidic transport around a rotating square cylinder in an unconfined medium. The convective transport originates as a consequence of the interaction between a uniform free-stream flow and the flow evolving due to the rotation of the sharp-edged body. A finite volume-based method and a body-fitted grid system along with the moving boundaries are used to obtain the numerical solution of the incompressible Navier–Stokes and energy equations. The Reynolds number based on the free-stream flow is considered in the range 10 ≤ Re ≤ 200, and the dimensionless rotational speed of the cylinder is kept 0 ≤ Ω ≤ 5. Depending on the Reynolds number and the rotational speed of the cylinder, the transport characteristics change. For the range 10 ≤ Re < 50, the flow remains steady irrespective of the rotational speed. In the range 50 ≤ Re ≤ 200, regular low-frequency Kármán vortex shedding (VS) is observed up to a critical rate of rotation (Ωcr ). Beyond Ωcr , the global convective transport shows a steady nature. The rotating circular cylinder also shows likewise degeneration of Kármán VS at some critical rotational speed. However, the heat transfer behavior varies significantly with a rotating circular cylinder. Such thermofluidic transport around a spinning square in an unconfined free-stream flow is reported for the first time.