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Title: | Shear-induced autorotation of freely rotatable cylinder in a channel flow at moderate Reynolds number Editor’s Pick | Authors: | Xia, Y Lin, J Ku, X Chan, T |
Issue Date: | Apr-2018 | Source: | Physics of fluids, Apr. 2018, v. 30, no. 4, 043303 | Abstract: | Flow past a center-pinned freely rotatable cylinder asymmetrically confined in a two-dimensional channel is simulated with the lattice Boltzmann method for a range of Reynolds number 0.1 ≤ Re ≤ 200, eccentricity ratio 0/8 ≤ ε ≤ 7/8, and blockage ratio 0.1 ≤ β ≤ 0.5. It is found that the inertia tends to facilitate the anomalous clockwise rotation of the cylinder. As the eccentricity ratio increases, the cylinder rotates faster in the counterclockwise direction and then slows down at a range of Re < 10. At a range of Re > 40, there exists an anomalous clockwise rotation for the cylinder at a low eccentricity ratio and the domain where the cylinder rotates anomalously becomes larger with the increase in the Reynolds number. In a channel with a higher blockage ratio, the rotation of the cylinder is more sensitive to the change of cylinder lateral position, and the separatrix at which the cylinder remains a state of rest moves upward generally. The cylinder is more likely to rotate counterclockwise and the rotating velocity is larger. At a lower blockage ratio, the anomalous clockwise rotation is more likely to occur, and the largest rotating velocity occurs when the blockage ratio is equal to 0.3. The mechanism of distinct rotational behavior of the cylinder is attributed to the transformation of distribution of shear stress which is resulted from the variation of pressure drop, the shift of maximum or minimum pressure zones along the upper and lower semi-cylinder surface, and the movement of stagnant point and separate point. Finally, the effects of the cylinder rotation on the flow structure and hydrodynamic force exerted on the cylinder surface are analyzed as well. | Publisher: | AIP Publishing LLC | Journal: | Physics of fluids | ISSN: | 1070-6631 | EISSN: | 1089-7666 | DOI: | 10.1063/1.5021877 | Rights: | © 2018 Author(s). This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Yi Xia, Jianzhong Lin, Xiaoke Ku, Tatleung Chan; Shear-induced autorotation of freely rotatable cylinder in a channel flow at moderate Reynolds number. Physics of Fluids 1 April 2018; 30 (4): 043303 and may be found at https://doi.org/10.1063/1.5021877. |
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043303_1_online.pdf | 6.39 MB | Adobe PDF | View/Open |
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