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Mixed-derivative skewness for high Prandtl and Reynolds numbers in homogeneous isotropic turbulence

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2016
auteur(s) Briard Antoine; Gomez Thomas
journal (abréviation) Physics of Fluids (Phys Fluid)
volume (numéro) 28 (8)
numéro de papier 081703
résumé The mixed-derivative skewness S uθ of a passive scalar field in high Reynolds and Prandtl numbers decaying homogeneous isotropic turbulence is studied numerically using eddy-damped quasi-normal Markovian closure, for Re λ ≥ 103 up to Pr = 105. A convergence of S uθ for Pr ≥ 103 is observed for any high enough Reynolds number. This asymptotic high Pr regime can be interpreted as a saturation of the mixing properties of the flow at small scales. The decay of the derivative skewnesses from high to low Reynolds numbers and the influence of large scales initial conditions are investigated as well.
mots clés Higher order statistics; Turbulence
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