The universality of intermittency in hydrodynamic turbulence is considered based on a recent model for the velocity gradient tensor evolution. Three possible versions of the model are investigated differing in the assumed correlation time-scale and forcing strength. Numerical tests show that the same (universal) anomalous relative scaling exponents are obtained for the three model variants. It is also found that transverse velocity gradients are more intermittent than longitudinal ones, whereas dissipation and enstrophy scale with the same exponents. The results are consistent with the universality of intermittency and relative scaling exponents, and suggest that these are dictated by the self-stretching terms that are the same in each variant of the model.
Le caractère universel du phénomène d'intermittence en turbulence est étudié à partir d'un modèle récent régissant l'évolution du tenseur des gradients de vitesse. Trois versions possibles du modèle, pour lesquelles les hypothèses retenues pour le temps de corrélation et l'amplitude du forçage sont différentes, sont analysées. Une intégration numérique des équations montre que les exposants anormaux des moments relatifs sont les mêmes pour les trois variantes du modèle. Il est de plus montré que les gradients transversaux de vitesse sont plus intermittents que les longitudinaux alors que la dissipation et l'enstrophie se comportent comme des lois de puissance de même exposant. Ces résultats sont cohérents avec l'universalité des exposants relatifs et suggèrent l'importance du terme d'auto-étirement, qui est identique dans les trois variantes du modèle.
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Mot clés : Turbulence, Intermittence, Géométrie
Laurent Chevillard 1; Charles Meneveau 1
@article{CRMECA_2007__335_4_187_0, author = {Laurent Chevillard and Charles Meneveau}, title = {Intermittency and universality in a {Lagrangian} model of velocity gradients in three-dimensional turbulence}, journal = {Comptes Rendus. M\'ecanique}, pages = {187--193}, publisher = {Elsevier}, volume = {335}, number = {4}, year = {2007}, doi = {10.1016/j.crme.2007.03.002}, language = {en}, }
TY - JOUR AU - Laurent Chevillard AU - Charles Meneveau TI - Intermittency and universality in a Lagrangian model of velocity gradients in three-dimensional turbulence JO - Comptes Rendus. Mécanique PY - 2007 SP - 187 EP - 193 VL - 335 IS - 4 PB - Elsevier DO - 10.1016/j.crme.2007.03.002 LA - en ID - CRMECA_2007__335_4_187_0 ER -
%0 Journal Article %A Laurent Chevillard %A Charles Meneveau %T Intermittency and universality in a Lagrangian model of velocity gradients in three-dimensional turbulence %J Comptes Rendus. Mécanique %D 2007 %P 187-193 %V 335 %N 4 %I Elsevier %R 10.1016/j.crme.2007.03.002 %G en %F CRMECA_2007__335_4_187_0
Laurent Chevillard; Charles Meneveau. Intermittency and universality in a Lagrangian model of velocity gradients in three-dimensional turbulence. Comptes Rendus. Mécanique, Volume 335 (2007) no. 4, pp. 187-193. doi : 10.1016/j.crme.2007.03.002. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2007.03.002/
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