Transitional Flow Dynamics Past a Passively Flapping Airfoil in Gusty Flow

Chandan Bose; Sayan Gupta; Sunetra Sarkar

doi:10.1007/978-3-030-55594-8_14

Transitional Flow Dynamics Past a Passively Flapping Airfoil in Gusty Flow

Chandan Bose^*, Sayan Gupta, Sunetra Sarkar

^*Corresponding author for this work

Metallurgy and Materials

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

Abstract

This paper investigates the transitional flow dynamics behind a passively flapping airfoil supported by nonlinear springs in the presence of gusty inflow. The fluid-structure interaction (FSI) framework is composed of an incompressible Navier-Stokes solver weakly coupled with a two degree-of-freedom (dof) nonlinear structural model. The fluid-elastic system shows a rich bifurcation behavior in terms of successive Hopf bifurcations in uniform flow condition as the mean wind speed is increased. Presence of gusty fluctuations in the inflow makes the dynamics more complex through transitional states that we refer to as ‘intermittency’ between different dynamical states. A regular intermittent state between quasi-periodic dynamics and low amplitude aperiodic response has been observed when the FSI system is subjected to a time harmonic gust in terms of sinusoidal fluctuation. A parametric study has been carried out for various amplitudes and frequencies of the sinusoidal fluctuation to demarcate the transitional regimes. Thereafter, the system is subjected to random gusts modeled as Ornstein-Uhlenbeck process and ‘on-off’ and ‘burst’ type intermittent dynamics have been observed for long time-scale and short time-scale input fluctuations respectively. The intermittent states have been characterized through time series analyses tools and the corresponding flow-field dynamics has been investigated in detail.

Original language	English
Title of host publication	Advances in Critical Flow Dynamics Involving Moving/Deformable Structures with Design Applications
Subtitle of host publication	Proceedings of the IUTAM Symposium on Critical Flow Dynamics involving Moving/Deformable Structures with Design applications, June 18-22, 2018, Santorini, Greece
Editors	Marianna Braza, Kerry Hourigan, Michael Triantafyllou
Publisher	Springer
Pages	135-148
Number of pages	14
ISBN (Electronic)	9783030555948
ISBN (Print)	9783030555931, 9783030555962
DOIs	https://doi.org/10.1007/978-3-030-55594-8_14
Publication status	Published - 11 Feb 2021
Event	IUTAM Symposium on Critical Flow Dynamics involving Moving/Deformable Structures with Design applications - Hotel-Resort De Sol, Greece Duration: 18 Jun 2018 → 22 Jun 2018

Publication series

Name	Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Volume	147
ISSN (Print)	1612-2909
ISSN (Electronic)	1860-0824

Conference

Conference	IUTAM Symposium on Critical Flow Dynamics involving Moving/Deformable Structures with Design applications
Country/Territory	Greece
Period	18/06/18 → 22/06/18

Bibliographical note

Publisher Copyright:
© 2021, Springer Nature Switzerland AG.

Keywords

Fluid-structure interactions
Intermittent flow-field
On-off intermittency
Ornstein-uhlenbeck process
Passive flapping
Time harmonic gust

ASJC Scopus subject areas

Fluid Flow and Transfer Processes

Access to Document

10.1007/978-3-030-55594-8_14Licence: None: All rights reserved

Cite this

Bose, C., Gupta, S., & Sarkar, S. (2021). Transitional Flow Dynamics Past a Passively Flapping Airfoil in Gusty Flow. In M. Braza, K. Hourigan, & M. Triantafyllou (Eds.), Advances in Critical Flow Dynamics Involving Moving/Deformable Structures with Design Applications: Proceedings of the IUTAM Symposium on Critical Flow Dynamics involving Moving/Deformable Structures with Design applications, June 18-22, 2018, Santorini, Greece (pp. 135-148). (Notes on Numerical Fluid Mechanics and Multidisciplinary Design; Vol. 147). Springer. https://doi.org/10.1007/978-3-030-55594-8_14

Bose, Chandan ; Gupta, Sayan ; Sarkar, Sunetra. / Transitional Flow Dynamics Past a Passively Flapping Airfoil in Gusty Flow. Advances in Critical Flow Dynamics Involving Moving/Deformable Structures with Design Applications: Proceedings of the IUTAM Symposium on Critical Flow Dynamics involving Moving/Deformable Structures with Design applications, June 18-22, 2018, Santorini, Greece. editor / Marianna Braza ; Kerry Hourigan ; Michael Triantafyllou. Springer, 2021. pp. 135-148 (Notes on Numerical Fluid Mechanics and Multidisciplinary Design).

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abstract = "This paper investigates the transitional flow dynamics behind a passively flapping airfoil supported by nonlinear springs in the presence of gusty inflow. The fluid-structure interaction (FSI) framework is composed of an incompressible Navier-Stokes solver weakly coupled with a two degree-of-freedom (dof) nonlinear structural model. The fluid-elastic system shows a rich bifurcation behavior in terms of successive Hopf bifurcations in uniform flow condition as the mean wind speed is increased. Presence of gusty fluctuations in the inflow makes the dynamics more complex through transitional states that we refer to as {\textquoteleft}intermittency{\textquoteright} between different dynamical states. A regular intermittent state between quasi-periodic dynamics and low amplitude aperiodic response has been observed when the FSI system is subjected to a time harmonic gust in terms of sinusoidal fluctuation. A parametric study has been carried out for various amplitudes and frequencies of the sinusoidal fluctuation to demarcate the transitional regimes. Thereafter, the system is subjected to random gusts modeled as Ornstein-Uhlenbeck process and {\textquoteleft}on-off{\textquoteright} and {\textquoteleft}burst{\textquoteright} type intermittent dynamics have been observed for long time-scale and short time-scale input fluctuations respectively. The intermittent states have been characterized through time series analyses tools and the corresponding flow-field dynamics has been investigated in detail.",

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Bose, C, Gupta, S & Sarkar, S 2021, Transitional Flow Dynamics Past a Passively Flapping Airfoil in Gusty Flow. in M Braza, K Hourigan & M Triantafyllou (eds), Advances in Critical Flow Dynamics Involving Moving/Deformable Structures with Design Applications: Proceedings of the IUTAM Symposium on Critical Flow Dynamics involving Moving/Deformable Structures with Design applications, June 18-22, 2018, Santorini, Greece. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol. 147, Springer, pp. 135-148, IUTAM Symposium on Critical Flow Dynamics involving Moving/Deformable Structures with Design applications, Greece, 18/06/18. https://doi.org/10.1007/978-3-030-55594-8_14

Transitional Flow Dynamics Past a Passively Flapping Airfoil in Gusty Flow. / Bose, Chandan; Gupta, Sayan; Sarkar, Sunetra.
Advances in Critical Flow Dynamics Involving Moving/Deformable Structures with Design Applications: Proceedings of the IUTAM Symposium on Critical Flow Dynamics involving Moving/Deformable Structures with Design applications, June 18-22, 2018, Santorini, Greece. ed. / Marianna Braza; Kerry Hourigan; Michael Triantafyllou. Springer, 2021. p. 135-148 (Notes on Numerical Fluid Mechanics and Multidisciplinary Design; Vol. 147).

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

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Bose C, Gupta S, Sarkar S. Transitional Flow Dynamics Past a Passively Flapping Airfoil in Gusty Flow. In Braza M, Hourigan K, Triantafyllou M, editors, Advances in Critical Flow Dynamics Involving Moving/Deformable Structures with Design Applications: Proceedings of the IUTAM Symposium on Critical Flow Dynamics involving Moving/Deformable Structures with Design applications, June 18-22, 2018, Santorini, Greece. Springer. 2021. p. 135-148. (Notes on Numerical Fluid Mechanics and Multidisciplinary Design). doi: 10.1007/978-3-030-55594-8_14