Abstract
The experimental studies on flow-induced vibrations (FIV) reduction of two side-by-side flexible cylinders inclined at 45° by using the helical strakes were carried out in a towing tank. The main aim of the experiment is to check whether the helical strakes with a pitch of 17.5D and a height of 0.25D, which is considered as the most effective vibration suppression device for the isolated cylinder undergoing vortex-shedding, still perform very well to reduce FIV of two inclined flexible cylinders in a side-by-side arrangement. The vibration of two identical inclined cylinders with a mass ratio of 1.90 and an aspect ratio of 350 was tested in the experiment. The center-to-center distance between the two cylinders was 3.0D. The uniform flow was simulated by towing the cylinder models along the tank. The towing velocity varied from 0.05 to 1.0 m/s with an interval of 0.05 m/s. The maximum Reynolds number can be up to 1.6×104. Three cases were experimentally studied in this paper, including two side-by-side inclined smooth cylinders, only one smooth cylinder fitted with helical strakes in the two side-by-side inclined cylinders system and both two cylinders attached with helical strakes. The variations of displacement amplitude, dominant frequency, FIV suppression efficiency and dominant mode for the two side-by-side inclined cylinders with reduced velocity were shown and discussed.
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Foundation item: This research was financially supported by the National Natural Science Foundation of China (Grant Nos. 51479135, 51679167 and 51379144), the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 51621092) and the Natural Science Foundation of Tianjin (Grant Nos. 15JCQNJC43900 and 15JCQNJC07700).
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Xu, Wh., Zhang, Sh., Zhou, Ld. et al. Use of Helical Strakes for FIV Suppression of Two Inclined Flexible Cylinders in A Side-by-Side Arrangement. China Ocean Eng 32, 331–340 (2018). https://doi.org/10.1007/s13344-018-0034-9
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DOI: https://doi.org/10.1007/s13344-018-0034-9