Generalized lift force model under vortex shedding

This paper proposes a generalized model for vortex shedding around static cylinder. is first step to bridge the gap between two existing families of Vortex Induced Vibration (VIV) models , namely (1) stochastic spectral and (2) wake-oscillator with coupled fluid structural equations. The family experimentally-based while second typically rely on theoretical phenomenological concepts. These use Van der Pol, Rayleigh or combination both oscillators lift equation. proposed generalizes these by combining all third degree terms in case model, i.e. considering equation oscillator only. It possible enrich more complex parametric because its parameters are identified from experimental data. A specificity stems observation that, cylinder low turbulence flow envelope measured force not perfectly mono-harmonic, nor deterministic. Turbulence wake expected create fluctuations envelope. In stochasticity consequently introduced reproduce fluctuations. based as an additive exogenous noise input using Von Karman spectrum. Its coefficients adjusted so that reproduces probability density function (and power density). methodology applied Wind Tunnel data circular subcritical postcritical regimes. set used identify non-linear fluctuation coefficient generated matches results available literature considered work focuses obtain body. can be other cross-sections even extended cylinders arranged tandem. • developed. Coefficients experiments. Addition better fits random resulting different