Abstract
The aerodynamic forces on a wall-mounted finite-length square cylinder are experimentally investigated. The width of the tested model d = 200 mm, and the aspect ratio H/d = 5. The oncoming flow velocity U ∞ = 13 m/s, corresponding to a Reynolds number of 1.73 × 105 based on U ∞ and d. It is found that the time-averaged drag coefficient \( \overline{{C_{D} }} \) and rms value of lift coefficient \( C^\prime_{L} \) of the finite-length cylinder are both smaller than those of 2D square cylinder. Two typical flow modes occur in the flow around the finite-length cylinder: Mode 1 is characterized by alternating spanwise vortex shedding, corresponding to a higher drag and large amplitude fluctuation of lift; Mode 2 is characterized by symmetrical vortex shedding, corresponding to a lower drag and the lift without periodic fluctuation. At the lower part of cylinder, \( C^\prime_{L} \) of Mode 1 is about one times larger than that of Mode 2, this difference reduces gradually with approaching to the free end. The spanwise correlation of aerodynamic force is stronger in Mode 1.
Financial support from the NSFC 11472312, 51108468 is acknowledged.
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Wang, H.F., Zou, C., Zhang, Y.P. (2016). Vortex Shedding Intermittency and Its Effects on the Aerodynamics Forces of a Finite-Length Square Cylinder. In: Zhou, Y., Lucey, A., Liu, Y., Huang, L. (eds) Fluid-Structure-Sound Interactions and Control. Lecture Notes in Mechanical Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-48868-3_66
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DOI: https://doi.org/10.1007/978-3-662-48868-3_66
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