Vortex-induced vibration of the upstream cylinder of a two-cylinder system in cruciform arrangement

Shirakashi, Masataka and Takahashi, Tsutomu and Kumagai, Isao and Matsumoto, Tsuyoshi (2001) Vortex-induced vibration of the upstream cylinder of a two-cylinder system in cruciform arrangement. JOURNAL OF COMPUTATIONAL AND APPLIED MECHANICS, 2 (1). pp. 103-122. ISSN 1586-2070

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Abstract

Comprehensive wind tunnel experiments are carried out on the longitudinal vortex excitation of the upstream cylinder in a cruciform two-cylinder system. The vortex structure around the crossing is dominated by the ratio of gap s to the downstream cylinder diameter ds, i.e., the trailing vortices shed when s/d_2 < 0.25 and the necklace vortices shed when 0.25 < s/d_2 < 0.7. Based on measurements under variable damping factor, criteria for occurrence of the longitudinal vortex excitations are presented and substantial alternating lift coefficients are proposed for them to estimate the excitation force. These results are of practical importance to predict and to avoid these newly found vortex excitations.

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