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- W3217187813 abstract "We experimentally investigated the attenuation of the von Kármán vortex street behind a circular cylinder by the use of active suction through a structured porous surface in wind tunnel tests. The Reynolds number Re, based on the outer diameter of the cylinder D, is set to be 1.0×104. The structured porous surface of the test model is made of resin by the three-dimensional printing technique to obtain well-organized porous structures. The active suction control effectiveness is quantified by a non-dimensional suction coefficient CQ, which is determined by the suction flow rate Q, the porous structure of the cylinder's surface, and the free stream velocity U∞. A high-speed particle image velocimetry measurement system is utilized to acquire global and detailed wake flows behind the baseline and controlled cylinders. In addition to directly perceived time-averaged characteristics, flow analysis methods including proper orthogonal decomposition, spectral analysis, and linear stability analysis are employed to study the underlying nature of cylinder wakes with and without distributed suction control. Experimental results show that multi-scale coherent structures in the cylinder wake are homogenized and the near wake is regularized under the control of suction. With a proper CQ, the alternating vortex street behind the circular cylinder is found to be greatly attenuated and the vortex shedding mode completely switched." @default.
- W3217187813 created "2021-12-06" @default.
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- W3217187813 date "2021-12-01" @default.
- W3217187813 modified "2023-09-23" @default.
- W3217187813 title "Attenuation of vortex street by suction through the structured porous surface" @default.
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- W3217187813 doi "https://doi.org/10.1063/5.0073150" @default.
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