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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:51 |
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Conference: Bucharest University Faculty of Physics 2021 Meeting
Section: Theoretical Physics and Applied Mathematics
Title:
Scaling laws of 2D incompressible turbulent transport
Authors:
M. GHITA (1), D. I. PALADE (2), M. VLAD (2)
Affiliation:
1) Faculty of Physics, University of Bucharest, Romania
2) National Institute for Laser, Plasma and Radiation Physics, Romania
E-mail
mariaaghita@gmail.com
Keywords:
turbulence, transport, incompressible, scaling
Abstract:
One of the fundamental problems of turbulence is the relation between the Eulerian characteristics of velocity fields and the Lagrangian characteristics of flows – represented by transport coefficients. The case of two-dimensional incompressible turbulence is particularly important in the description of magnetically confined plasmas, astrophysical plasmas, incompressible fluids, magnetic field lines wandering, etc. The resulting transport is known to be anomalous with supposingly universal scaling laws. In the present work we intent to take under scrutiny the dependency between the scaling exponents and the Eulerian properties of turbulence using the direct numerical simulation method (DNS), a state-of-the-art statistical approach to stochastic transport. The results are confirmed qualitatively using an approximative statistical approach, the Decorrelation Trajectory Method (DTM). We find that the exponents are weakly dependent on the turbulence spectra (~10%). We proceed to a quantitative characterization of these dependencies.
References:
Acknowledgement:
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