Ovalling oscillations of cylindrical shells in cross-flow: A review and some new results

Unsteady Reynolds averaged Navier–Stokes simulation of the post-critical flow around a closely spaced group of silos

“…The large difference between the natural ovalling frequencies (figure 1) and the vortex shedding frequencies in present simulations ( f vs in table 1), confirms that subharmonic excitation by vortex shedding is a condition neither necessary nor sufficient for the onset of ovalling [23]. Furthermore, Païdoussis et al [24] have convincingly shown that conventional vortex shedding cannot excite ovalling oscillations of cylindrical shells in cross flow since ovalling of a single cylinder also occurs when a long splitter plate in the wake suppresses periodic vortex shedding. Although the periodicities in the interstitial flow may be very different from classical vortex shedding, these do not seem to be related to ovalling, since they occur throughout the entire group while ovalling is only observed on the corner silos.…”

Wind-structure interaction simulations of ovalling vibrations in silo groups

“…Even when vortex shedding was completely suppressed, e.g. by mounting a splitter plate in the wake of the shell structure, ovalling was still observed [137,188,189]. The results of all these studies clearly suggest that periodic vortex shedding is not related to the occurrence of ovalling vibrations of shell structures which does not necessarily mean that ovalling and vortex shedding cannot occur simultaneously.…”

Wind Loading of Structures: Framework, Phenomena, Tools and Codification

“…This phenomenon is very dangerous for the steel structures in which the repetition of large vibrations in a wide neighborhood of the critical wind velocity may cause fatigue damage accumulation. Figure 31 Finally, in addition to strong crosswind vibrations, the alternate shedding of vortices may also give rise to ovalling deformation and oscillations [160][161][162] of thin shell circular cross-section structures such as steel chimneys, silos and tanks (Figure 34). In all these cases the use of suitable stiffening rings may mitigate up to eliminate these phenomena.…”