Stability analysis of passive suppression for vortex-induced vibration

Critical effect of fore-aft tapering on galloping triggering for a trapezoidal body

“…Similar observations on the relationship between galloping stability and attack angles were reported by (Ding et al 2015;Zhang et al 2016b). Bukka, Magee & Jaiman (2020) attempted to suppress the FIV response, especially the galloping phenomenon, of the system through the inclusion of passive suppression devices in the tail of the structure. The shapes of the suppression devices considered in this study encompass a number of interesting configurations: namely, a fairing (two strips affixed tangent to the upper and lower ends of the cylinder), a splitter plate (a strip attached perpendicular to the tail section of the cylinder, cf.…”

“…Moreover, the FIV behaviour of the connected-C device with its radius identical to the cylinder radius was observed to be similar to that of a fairing in the sense that both devices were shown to suppress successfully the occurrence of FIV. However, decreasing the radius of a C-shaped foil in a connected C was found to provoke structural instability and lead to galloping -one interesting phenomenon did not cause Bukka et al (2020) to think and explore further.…”

“…This leaves an important gap in our current knowledge of the effects of shape in the transition of the vibration response characteristics from lock-in to galloping. Following on from the investigation of Yao & Jaiman (2017), the above-introduced works by Bukka et al (2020) also applied LSA using ROM/ERA and demonstrated that a LSA based on ROM/ERA can be used to provide physically insightful explanations for the FIV response of an elastically supported structure from the perspective of modal mechanisms.…”

“…However, decreasing the radius of a -shaped foil in a connected was found to provoke structural instability and lead to galloping – one interesting phenomenon did not cause Bukka et al. (2020) to think and explore further.

Figure 2.Passive suppression devices investigated by Bukka et al.

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Suppression of vortex shedding using a slit through the circular cylinder at low Reynolds number

“…The unsteady analysis over the passive flow controlled cylinder provides a qualitative description of the suppression of vortex shedding. Bukka et al 43 studied the suppression of vortex-induced vibration using a passive flow control device (fairing and C-type connecting device). To quantify the suppression through the energy modes and identify the vortical structure, the study employs the proper orthogonal decomposition (POD) technique.…”