Volume 64, Number 4, November 2003
|Page(s)||461 - 467|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 November 2003|
Universality of anisotropic fluctuations from numerical simulations of turbulent flows
Università “Tor Vergata” and INFM - Via della Ricerca Scientifica 1
I-00133 Roma, Italy
2 Università di Ferrara and INFN - Via Paradiso 12, I-43100 Ferrara, Italy
3 CNR, IAC - Viale del Policlinico 137, I-00161, Roma, Italy
Accepted: 8 September 2003
We present new results from a direct numerical simulation of a three-dimensional homogeneous Rayleigh-Bénard system (HRB), i.e. a convective cell with an imposed linear mean temperature profile along the vertical direction. We measure the SO(3)-decomposition of both velocity structure functions and buoyancy terms. We give a dimensional prediction for the values of the anisotropic scaling exponents in this Rayleigh-Bénard systems. Measured scaling does not follow dimensional estimate, while a better agreement can be found with the anisotropic scaling of a different system, the random-Kolmogorov-flow (RKF) (Biferale L., Daumont I., Lanotte A. and Toschi F. Phys. Rev. E, 66 (2002) 056306). Our findings support the conclusion that scaling properties of anisotropic fluctuations are universal, i.e. independent of the forcing mechanism sustaining the turbulent flow.
PACS: 47.27.Ak – Turbulent flows, convection, and heat transfer: Fundamentals / 47.27.Eq – Turbulence simulation and modeling / 47.27.Te – Convection and heat transfer
© EDP Sciences, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.