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Some Dynamical Features of the Turbulent Flow of a Viscoelastic Fluid for Reduced Drag

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2012
auteur(s) Thais Laurent; Mompean Gilmar; Gatski Thomas B.
journal (abréviation) Journal of Turbulence (JoT)
volume (numéro) 13
numéro de papier N19
  
résumé It is well-known that the addition of minute amounts of long polymer chains to organic solvents, or water, can lead to significant turbulent drag reduction. In the present study, direct numerical simulations (DNS) of turbulent channel flow of a viscoelastic fluid, at zero- shear friction Reynolds numbers up to of 1000 are analyzed. Both the mean and turbulent fields are studied, but with a primary focus on the turbulent stress and viscoelastic extra- stress (conformation tensor) fields in order to contrast the dynamics of each. An analysis of both the turbulent kinetic energy and elastic energy budgets is made with emphasis on the interactive dynamics between the two fields.
mots clés Turbulent channel flow; viscoelastic fluid; drag reduction; FENE-P model
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