Slow and random phase models for vortex-induced vibrations

Vortex-induced vibrations (VIV) present significant challenges in understanding and mod- eling the cross-wind behavior of structures subjected to fluid flow. This presentation has provided a review and comparison of some existing models, classified under the families A, B, and C as defined in [1]. After recalling the rationale behind the well-known spectral method, which falls within the B-family, some limitations of the wake-oscillator model from family C were highlighted. In particular, although several additional models have been developed since the seminal works of Hartlen and Currie [2], and Tamura [3], models from this family are seldom used today in the wind engineering community. One reason that could explain this reluctance to use such models is that, in their current form, they still usually operate in a deterministic setting.
The talk addressed stochasticity from two main sources within fluid-structure interaction. The first source is the oncoming wind flow, which characterizes turbulence in the atmospheric boundary layer and affects the vibration response of structures, relevant to tower and chimney design. The second source arises from turbulence in the near wake, creating randomness as vortices are shed, observable in a fixed cylinder in uniform flow with a slowly changing lift force envelope.
This short summary of the presentation gives a glimpse of the main messages and highlights some comments that were made during the discussions after the presentation.