XIONG, Yong Liang; BRUNEAU, Charles-Henri; KELLAY, Hamid

doi:10.1209/0295-5075/91/64001

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XIONG, Yong Liang
Institut de Mathématiques de Bordeaux [IMB]

BRUNEAU, Charles-Henri
Institut de Mathématiques de Bordeaux [IMB]

KELLAY, Hamid
Centre de physique moléculaire optique et hertzienne [CPMOH]

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EPL - Europhysics Letters. 2010-09, vol. 91, n° 6

European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing

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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.< Leer menos

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Drag enhancement and drag reduction in viscoelastic fluid flow around a cylinder

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