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Two-dimensional elastic turbulence

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2008
auteur(s) Berti Stefano; Bistagnino A.; Boffetta Guido; Celani A.; Musacchio S.
journal (abréviation) Physical Review E (Phys Rev E)
volume (numéro) 77 (5)
numéro de papier 055306
résumé We report numerical evidence of elastic turbulence phenomenology in a two-dimensional periodic Kolmogorov flow. By direct numerical simulations of the Oldroyd-B viscoelastic model at very small Reynolds numbers, we find that above the elastic instability threshold the flow develops an elastic turbulent regime. We observe that both the turbulent drag and the Lyapunov exponent increase with the Weissenberg number, indicating the presence of a disordered, turbulentlike mixing flow. The energy spectrum develops a power-law scaling range with an exponent close to the experimental and theoretical expectations.
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