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Experimental observation of viscoelastic fluid–structure interactions

Published online by Cambridge University Press:  26 January 2017

Anita A. Dey ,
Yahya Modarres-Sadeghi  and
Jonathan P. Rothstein
Anita A. Dey
Affiliation:
Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003, USA
Yahya Modarres-Sadeghi
Affiliation:
Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003, USA
Jonathan P. Rothstein*
Affiliation:
Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003, USA
*
†Email address for correspondence: rothstein@ecs.umass.edu
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Abstract

It is well known that when a flexible or flexibly mounted structure is placed perpendicular to the flow of a Newtonian fluid, it can oscillate due to the shedding of separated vortices. Here, we show for the first time that fluid–structure interactions can also be observed when the fluid is viscoelastic. For viscoelastic fluids, a flexible structure can become unstable in the absence of fluid inertia, at infinitesimal Reynolds numbers, due to the onset of a purely elastic flow instability. Nonlinear periodic oscillations of the flexible structure are observed and found to be coupled to the time-dependent growth and decay of viscoelastic stresses in the wake of the structure.

JFM classification

Low-Reynolds-number flows: Low-Reynolds-number flows Non-Newtonian Flows: Viscoelasticity
Type
Rapids
Information
Journal of Fluid Mechanics , Volume 813 , 25 February 2017 , R5
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Copyright
© 2017 Cambridge University Press 

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