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Les travaux de recherche sur les projets : BIOENGINE, NEPTUNE, TIGRE, MADNESS, SUPERMEN, CO2 VIDRIS, EMOPLAF, Energétique du Bâtiment sont cofinancés par l’Union européenne. L’Europe s’engage en Normandie avec le Fonds européen de développement régional (FEDER).


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Les événements de la journée

1 événement

  • Mardi 17 décembre 14:00-15:00 - Bérengère Dubrulle - Service de Physique de l’Etat Condensé, CNRS, CEA Saclay, Université Paris-Saclay

    Revisiting Kolmogorov Theory

    Résumé : Turbulent flows are characterized by a self-similar energy spectrum, signature of fluid movements at all scales. This organization has been described for more than 70 years by the phenomenology of "Kolmogorov cascade" : the energy injected on a large scale by the work of the force that moves the fluid (e. g. a turbine) is transferred to smaller and smaller scales with a constant dissipation rate, up to the Kolmogorov scale, where it is transformed into heat and dissipated by viscosity. I will explain why this image, which Landau questioned in the 1950s, is false. I will use recent velocity measurements obtained by very high-resolution laser velocimetry to show that the energy "cascade" is in fact driven by extreme events on a very small scale, which are the signature of quasi-singularities of the Navier-Stokes equations existing under the Kolmogorov scale.

    Lieu : LOMC

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