Wake oscillator equations in modelling vortex-induced vibrations at low mass ratios

Victoria Kurushina; Ekaterina Pavlovskaia

doi:10.1109/OCEANSE.2017.8084644

Wake oscillator equations in modelling vortex-induced vibrations at low mass ratios

Victoria Kurushina, Ekaterina Pavlovskaia

Research output: Chapter in Book/Report/Conference proceeding › Published conference contribution

5 Citations (Scopus)

Abstract

The current research explores the capabilities of Rayleigh and Van der Pol equations from the standpoint of accuracy of vortex-induced vibrations (VIV) modelling for low mass ratio cases. The two degree-of-freedom rigid structure model suggested by Postnikov et al. [1] is used as the base case, and the fluid equations are modified to create 7 options as alternatives to this model. The considered options constitute variation in damping terms, including introduction of additional damping coefficients (as different Van der Pol or Rayleigh parameters). Then the calibration is performed to identify the best set of coefficients to provide accurate match with the experimental data. The main aim is to predict correctly the development of the super-upper branch [2]. Experimental results by Stappenbelt and Lalji [3] for mass ratio 2.36 are utilised for the model calibration. Then the obtained models are validated using data from the series of experiments by Stappenbelt and Lalji [3] and published experimental data from other sources [2, 4]. The obtained results demonstrate the advantages of changes in damping terms. Overall, it is concluded that Rayleigh oscillator can be recommended to approximate the lift coefficient for low mass ratios.

Original language	English
Title of host publication	OCEANS 2017 - Aberdeen
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	1-6
Number of pages	6
ISBN (Electronic)	9781509052783
ISBN (Print)	9781509052790
DOIs	https://doi.org/10.1109/OCEANSE.2017.8084644
Publication status	Published - 25 Oct 2017
Event	OCEANS 2017 - Aberdeen - Aberdeen, United Kingdom Duration: 19 Jun 2017 → 22 Jun 2017

Conference

Conference	OCEANS 2017 - Aberdeen
Country/Territory	United Kingdom
City	Aberdeen
Period	19/06/17 → 22/06/17

Bibliographical note

V.K. would like to acknowledge the support of the Tyumen Industrial University, Tyumen, Russia, and the State Program ”Global Education”, Russia.
This work was performed using the Maxwell High Performance Computing Cluster of the University of Aberdeen IT Service, provided by Dell Inc. and supported by Alces Software.
Authors would like to express their gratitude to Dr. Andrew Starkey for advices regarding optimization procedures and to Naveed Khan for technical advices on accelerating computations.

Keywords

calibration of the model
elastically-mounted cylinder
low mass ratio
vortex-induced vibration
wake oscillator model

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Cite this

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title = "Wake oscillator equations in modelling vortex-induced vibrations at low mass ratios",

abstract = "The current research explores the capabilities of Rayleigh and Van der Pol equations from the standpoint of accuracy of vortex-induced vibrations (VIV) modelling for low mass ratio cases. The two degree-of-freedom rigid structure model suggested by Postnikov et al. [1] is used as the base case, and the fluid equations are modified to create 7 options as alternatives to this model. The considered options constitute variation in damping terms, including introduction of additional damping coefficients (as different Van der Pol or Rayleigh parameters). Then the calibration is performed to identify the best set of coefficients to provide accurate match with the experimental data. The main aim is to predict correctly the development of the super-upper branch [2]. Experimental results by Stappenbelt and Lalji [3] for mass ratio 2.36 are utilised for the model calibration. Then the obtained models are validated using data from the series of experiments by Stappenbelt and Lalji [3] and published experimental data from other sources [2, 4]. The obtained results demonstrate the advantages of changes in damping terms. Overall, it is concluded that Rayleigh oscillator can be recommended to approximate the lift coefficient for low mass ratios.",

keywords = "calibration of the model, elastically-mounted cylinder, low mass ratio, vortex-induced vibration, wake oscillator model",

author = "Victoria Kurushina and Ekaterina Pavlovskaia",

note = "V.K. would like to acknowledge the support of the Tyumen Industrial University, Tyumen, Russia, and the State Program ”Global Education”, Russia. This work was performed using the Maxwell High Performance Computing Cluster of the University of Aberdeen IT Service, provided by Dell Inc. and supported by Alces Software. Authors would like to express their gratitude to Dr. Andrew Starkey for advices regarding optimization procedures and to Naveed Khan for technical advices on accelerating computations.; OCEANS 2017 - Aberdeen ; Conference date: 19-06-2017 Through 22-06-2017",

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N2 - The current research explores the capabilities of Rayleigh and Van der Pol equations from the standpoint of accuracy of vortex-induced vibrations (VIV) modelling for low mass ratio cases. The two degree-of-freedom rigid structure model suggested by Postnikov et al. [1] is used as the base case, and the fluid equations are modified to create 7 options as alternatives to this model. The considered options constitute variation in damping terms, including introduction of additional damping coefficients (as different Van der Pol or Rayleigh parameters). Then the calibration is performed to identify the best set of coefficients to provide accurate match with the experimental data. The main aim is to predict correctly the development of the super-upper branch [2]. Experimental results by Stappenbelt and Lalji [3] for mass ratio 2.36 are utilised for the model calibration. Then the obtained models are validated using data from the series of experiments by Stappenbelt and Lalji [3] and published experimental data from other sources [2, 4]. The obtained results demonstrate the advantages of changes in damping terms. Overall, it is concluded that Rayleigh oscillator can be recommended to approximate the lift coefficient for low mass ratios.

AB - The current research explores the capabilities of Rayleigh and Van der Pol equations from the standpoint of accuracy of vortex-induced vibrations (VIV) modelling for low mass ratio cases. The two degree-of-freedom rigid structure model suggested by Postnikov et al. [1] is used as the base case, and the fluid equations are modified to create 7 options as alternatives to this model. The considered options constitute variation in damping terms, including introduction of additional damping coefficients (as different Van der Pol or Rayleigh parameters). Then the calibration is performed to identify the best set of coefficients to provide accurate match with the experimental data. The main aim is to predict correctly the development of the super-upper branch [2]. Experimental results by Stappenbelt and Lalji [3] for mass ratio 2.36 are utilised for the model calibration. Then the obtained models are validated using data from the series of experiments by Stappenbelt and Lalji [3] and published experimental data from other sources [2, 4]. The obtained results demonstrate the advantages of changes in damping terms. Overall, it is concluded that Rayleigh oscillator can be recommended to approximate the lift coefficient for low mass ratios.

KW - calibration of the model

KW - elastically-mounted cylinder

KW - low mass ratio

KW - vortex-induced vibration

KW - wake oscillator model

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Wake oscillator equations in modelling vortex-induced vibrations at low mass ratios

Abstract

Conference

Bibliographical note

Keywords

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