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Direct numerical simulation of 2D channel flows in the presence of polymers

yong Liang Xiong 1, 2 Charles-Henri Bruneau 1, 2 Hamid Kellay 3 
2 MC2 - Modélisation, contrôle et calcul
Inria Bordeaux - Sud-Ouest, UB - Université de Bordeaux, CNRS - Centre National de la Recherche Scientifique : UMR5251
Abstract : We here use direct numerical simulations to describe the flow of a viscoelastic fluid, modeled using the so-called Oldroyd B model, around a cylinder in two dimensions. A wide range of flow parameters is covered in these simulations allowing to draw definitive conclusions as to the effect of viscoelasticity on such a flow situation. Both drag enhancement and drag reduction are observed and a phase diagram is proposed in the parameter space Reynolds number vs. Weissenberg number. While only drag enhancement is observed below a Reynolds number of 40, both drag enhancement and drag reduction are observed for higher Reynolds numbers indicating that drag reduction is a feature associated with the shedding of vortices behind the cylinder. An interesting observation accompanies the onset of drag enhancement in the vortex-shedding regime: the shedding is suppressed.
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https://hal.inria.fr/hal-00664966
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Submitted on : Tuesday, January 31, 2012 - 6:54:54 PM
Last modification on : Tuesday, December 21, 2021 - 3:34:04 PM

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yong Liang Xiong, Charles-Henri Bruneau, Hamid Kellay. Direct numerical simulation of 2D channel flows in the presence of polymers. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2011, 95 (6), ⟨10.1209/0295-5075/95/64003⟩. ⟨hal-00664966⟩

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