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Significant influence of fluid viscoelasticity on flow dynamics past an oscillating cylinder

Published online by Cambridge University Press:  16 November 2023

Faheem Hamid Open the ORCID record for Faheem Hamid [Opens in a new window]  and
C. Sasmal Open the ORCID record for C. Sasmal [Opens in a new window]
Faheem Hamid
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
C. Sasmal*
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
*
†Email address for correspondence: [email protected]
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Abstract

This study focuses on numerically investigating the impact of fluid viscoelasticity on the flow dynamics around a transversely forced oscillating cylinder operating in the laminar vortex shedding regime at a fixed Reynolds number of $Re = 100$. Specifically, we explore how fluid viscoelasticity affects the boundary between the lock-in and no lock-in regions and the corresponding wake characteristics compared with a simple Newtonian fluid. Our findings reveal that fluid viscoelasticity enables the synchronization of the vortex street with the cylinder motion at lower oscillation frequencies than those required for a Newtonian fluid. Consequently, the lock-in region boundary for a viscoelastic fluid differs from that of a Newtonian fluid and expands in the non-dimensional cylinder oscillation amplitude and frequency parameter space. In the primary synchronization region, the wake of a Newtonian fluid exhibits ‘2S’ (two single vortices) and ‘P+S’ (a pair of vortices and a single vortex) shedding modes. In contrast, a ‘2P’ (two pairs of vortices) vortex mode is observed for a viscoelastic fluid within the same region. To gain a deeper understanding of the differences in the coherent flow structures and their associated frequencies between the two fluids, we employ the data-driven reduced-order modelling technique, known as the dynamic mode decomposition (DMD) technique. Utilizing this technique, we successfully extract and visualize the two competing fundamental frequencies (cylinder oscillation and natural vortex shedding frequencies) and their associated flow structures in the case of the no lock-in state, whereas only the dominant cylinder oscillation frequency and associated flow structure in the case of the lock-in state. Furthermore, we propose that the presence of excess strain resulting from the stretching of polymer molecules in viscoelastic fluids leads to a distinct difference in the wake structure compared with Newtonian fluids. This observation aligns with the findings obtained from the $Q$-criterion and vorticity transport analysis of the wake.

JFM classification

Non-Newtonian Flows: Viscoelasticity Vortex Flows: Vortex shedding
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 975 , 25 November 2023 , A26
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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