A Model for Vortex Induced Oscillation of Structures

Iwan, W. D.; Blevins, Robert D.

doi:10.1115/1.3423352

Cited by 219 publications

(81 citation statements)

References 3 publications

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“…Iwan (1975) extended the model of Iwan and Blevins (1974) to predict the maximum VIV amplitude of taut strings and circular cylindrical beams with different end conditions. Iwan (1981) also derived an analytical model for the VIV of elastic structures under non-uniform flows.…”

Section: Literature Summarymentioning

confidence: 99%

“…They also introduced the Skop-Griffin parameter, which is now commonly used in studying VIV problems. Iwan and Blevins (1974) considered the fluid mechanics of the vortex street and developed a model in terms of a fluid variable that captures the fluid dynamics effects of the problem. Landl (1975) added a nonlinear aerodynamic damping term of fifth order to the van der Pol oscillator in his two-equation model, suggesting that this enables better capturing of some physical characteristics.…”

Section: Literature Summarymentioning

confidence: 99%

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Modeling Steady-state and Transient Forces on a Cylinder

Marzouk

Nayfeh

Akhtar

et al. 2007

Journal of Vibration and Control

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Numerical simulations of flow past a stationary circular cylinder at different Reynolds numbers have been performed using a computational fluid dynamics (CFD) solver that is based on the Reynoldsaveraged Navier-Stokes equations (RANS). The results obtained are used to develop reduced-order models for the lift and drag coefficients. The models do not only match the numerical simulation results in the time domain, but also in the spectral domain. They capture the steady-state region with excellent accuracy. Further, the models are verified by comparing their results in the transient region with their counterparts from the CFD simulations and a very good agreement is found. The work performed here is a step towards building models for vortex-induced vibrations (VIV) encountered in risers, spars, and other offshore structures.

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Section: Literature Summarymentioning

confidence: 99%

Section: Literature Summarymentioning

confidence: 99%

Modeling Steady-state and Transient Forces on a Cylinder

Marzouk

Nayfeh

Akhtar

et al. 2007

Journal of Vibration and Control

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show abstract

“…This form of modelling, according to Hartlen & Currie (1970), was introduced by Birkhoff & Zarantanello (1957). Earlier models include those developed by Bishop & Hassan (1964), Skop & Griffin (1973) and Iwan & Blevins (1974). For example, Hartlen & Currie assume a simple spring-mass-damper equation for the cylinder, dependent upon a time-varying lift coefficient.…”

Section: (I) Wake-body Coupled Modelsmentioning

confidence: 99%

Modelling vortex-induced fluid–structure interaction

Benaroya

Gabbai

2007

Phil. Trans. R. Soc. A.

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The principal goal of this research is developing physics-based, reduced-order, analytical models of nonlinear fluid-structure interactions associated with offshore structures. Our primary focus is to generalize the Hamilton's variational framework so that systems of flowoscillator equations can be derived from first principles. This is an extension of earlier work that led to a single energy equation describing the fluid-structure interaction. It is demonstrated here that flow-oscillator models are a subclass of the general, physical-based framework. A flow-oscillator model is a reduced-order mechanical model, generally comprising two mechanical oscillators, one modelling the structural oscillation and the other a nonlinear oscillator representing the fluid behaviour coupled to the structural motion.Reduced-order analytical model development continues to be carried out using a Hamilton's principle-based variational approach. This provides flexibility in the long run for generalizing the modelling paradigm to complex, three-dimensional problems with multiple degrees of freedom, although such extension is very difficult. As both experimental and analytical capabilities advance, the critical research path to developing and implementing fluid-structure interaction models entails -formulating generalized equations of motion, as a superset of the flow-oscillator models; and -developing experimentally derived, semi-analytical functions to describe key terms in the governing equations of motion. The developed variational approach yields a system of governing equations. This will allow modelling of multiple d.f. systems. The extensions derived generalize the Hamilton's variational formulation for such problems. The Navier-Stokes equations are derived and coupled to the structural oscillator. This general model has been shown to be a superset of the flow-oscillator model. Based on different assumptions, one can derive a variety of flowoscillator models.

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“…Esta linha de modelagem é conhecida como wake oscillators. Exemplos clássicos desta abordagem são discutidos em Hartlen & Currie (1970), Iwan & Blevins (1974), Skop & Balasubramanian (1997), Fujarra & Pesce (2002), Facchinetti et al (2004). Esta linha de pesquisa tem sido muito bem explorada no âmbito da EP-USP, ver por exemplo: Parra (1996), Fujarra (2002), Silveira et al (2007), Franzini et al (2009), Silveira (2009 Essa configuração estudada visava entender a resposta de estruturas comuns à engenharia civil tais quais a passagem de vento através de chaminés implantadas em 2 Cantilever é o nome dado à condição de contorno na qual o cilindro está engastado em uma extremidade, enquanto a outra permanece livre.…”

Section: Parâmetro Símbolo Expressãounclassified

“…Os avanços no campo da previsão do fenômeno ressonante começaram com a fundamentação teórica apresentada em e Skop & Griffin (1975), na qual o modelo fenomenológico que utiliza a equação de van der Pol foi modificado de forma a estender os estudos prévios feitos com cilindros rígidos Griffin et al, 1973;Iwan & Blevins, 1974) para o estudo de sistemas com cilindros flexíveis.…”

Section: Parâmetro Símbolo Expressãounclassified

Estudo experimental das vibrações induzidas pela emissão de vórtices em cilindros flexíveis inclinados em relação à correnteza.

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A Model for Vortex Induced Oscillation of Structures

Cited by 219 publications

References 3 publications

Modeling Steady-state and Transient Forces on a Cylinder

Modeling Steady-state and Transient Forces on a Cylinder

Modelling vortex-induced fluid–structure interaction

Estudo experimental das vibrações induzidas pela emissão de vórtices em cilindros flexíveis inclinados em relação à correnteza.

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