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Article Dans Une Revue EPL - Europhysics Letters Année : 2011

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

Résumé

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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Dates et versions

hal-00664966 , version 1 (31-01-2012)

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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, 2011, 95 (6), ⟨10.1209/0295-5075/95/64003⟩. ⟨hal-00664966⟩
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