Tamura’s nonlinear wake oscillator model was built upon physical considerations of the near-wake behaviour of the circular cylinder. Although a certain success has been obtained in the literature using it to predict the interaction of vortex induced vibration and galloping, the physical arguments concerning the near-wake behaviour, which is a strong point of Tamura’s model, have never been carefully examined for sharp-edged bluff bodies. In particular, it has been noticed that the various versions of Tamura’s model tend to reflect unrealistic near-wake geometry for rectangular cylinders. Therefore, new modifications to the wake-oscillator model were proposed based on physical considerations. Wake flow measurements revealed the opportunity of these modifications, for both the 2:1 rectangular cylinder and the square cylinder. Moreover, a new method was developed to identify a key parameter from wake measurements. In this way, all the parameters in the wake-oscillator model are measured based on their physical meaning, without any calibration.
A modified wake-oscillator model for VIV-galloping interaction of sharp-edged bluff bodies / Chen, C., Mannini, C., Bartoli, G., Thiele, K.. - ELETTRONICO. - (2022), pp. 163-166. (Intervento presentato al convegno 8th European and African Conference on Wind Engineering EACWE tenutosi a Bucarest, Romania nel 20-23 September 2022).
A modified wake-oscillator model for VIV-galloping interaction of sharp-edged bluff bodies
Mannini C.Conceptualization
;Bartoli G.Membro del Collaboration Group
;Thiele K.Membro del Collaboration Group
2022
Abstract
Tamura’s nonlinear wake oscillator model was built upon physical considerations of the near-wake behaviour of the circular cylinder. Although a certain success has been obtained in the literature using it to predict the interaction of vortex induced vibration and galloping, the physical arguments concerning the near-wake behaviour, which is a strong point of Tamura’s model, have never been carefully examined for sharp-edged bluff bodies. In particular, it has been noticed that the various versions of Tamura’s model tend to reflect unrealistic near-wake geometry for rectangular cylinders. Therefore, new modifications to the wake-oscillator model were proposed based on physical considerations. Wake flow measurements revealed the opportunity of these modifications, for both the 2:1 rectangular cylinder and the square cylinder. Moreover, a new method was developed to identify a key parameter from wake measurements. In this way, all the parameters in the wake-oscillator model are measured based on their physical meaning, without any calibration.
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