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- W2979343911 abstract "The nonlinear character of the primary bifurcation is investigated for the flow around a flexibly mounted circular cylinder. We have considered the cases in which the cylinder can oscillate in the transverse direction only and in both transverse and in-line directions. Low and high values of mass ratio ( $m^{ast }=5$ and 50) were studied, and reduced velocity ( $V_{r}$ ) values are chosen inside ( $V_{r}=9$ ) and outside ( $V_{r}=5$ and $V_{r}=13$ ) the lock-in range for low Reynolds numbers. For each combination of $m^{ast }$ and $V_{r}$ , a global linear stability analysis was applied to find the critical Reynolds number $Re_{c}$ of the fluid–structure system. For $V_{r}$ in the lock-in range, the values of $Re_{c}$ were noticeably less than the critical Reynolds number of the flow around a fixed circular cylinder ( $Re_{c_{0}}cong 47$ ). On the other hand, for $V_{r}$ outside the lock-in range, the values of $Re_{c}$ were close to $Re_{c_{0}}$ . Next, nonlinear analyses were performed in the vicinity of $Re_{c}$ for each case. Subcritical character (with hysteresis) was observed for $V_{r}$ in the lock-in range, while for $V_{r}$ outside the lock-in region the bifurcations were found to be supercritical (without hysteresis). This shows that when the coupling between the structure and flow is strong, due to the proximity of the natural frequencies of the isolated systems, it significantly changes both the linear and nonlinear responses observed." @default.
- W2979343911 created "2019-10-18" @default.
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- W2979343911 date "2019-10-08" @default.
- W2979343911 modified "2023-09-30" @default.
- W2979343911 title "Bifurcation analysis of the primary instability in the flow around a flexibly mounted circular cylinder" @default.
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- W2979343911 doi "https://doi.org/10.1017/jfm.2019.754" @default.
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