Scaling of Acceleration Statistics in High Reynolds Number Turbulence

Autor:	Dhawal Buaria, Katepalli Sreenivasan
Rok vydání:	2022
Předmět:	Physics::Fluid Dynamics Fluid Dynamics (physics.flu-dyn) Soft Condensed Matter (cond-mat.soft) FOS: Physical sciences General Physics and Astronomy Physics - Fluid Dynamics Condensed Matter - Soft Condensed Matter
Zdroj:	Physical Review Letters. 128
ISSN:	1079-7114 0031-9007
Popis:	The scaling of acceleration statistics in turbulence is examined by combining data from the literature with new data from well-resolved direct numerical simulations of isotropic turbulence, significantly extending the Reynolds number range. The acceleration variance at higher Reynolds numbers departs from previous predictions based on multifractal models, which characterize Lagrangian intermittency as a naive extension of Eulerian intermittency. The disagreement is even more prominent for higher-order moments of the acceleration. Instead, starting from a known exact relation, we relate the scaling of acceleration variance to that of Eulerian fourth-order velocity gradient and velocity increment statistics. This prediction is in excellent agreement with the variance data. Our work highlights the need for models that consider Lagrangian intermittency independent of the Eulerian counterpart. Comment: 6 pages, 4 figures + 6 pages of supplementary material
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::083119b2769c94000d9e15f383ec3b91 https://doi.org/10.1103/physrevlett.128.234502 Zobrazit plný text záznamu