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Transitions of turbulent superstructures in generalized Kolmogorov flow

Title data

Lalescu, Cristian ; Wilczek, Michael:
Transitions of turbulent superstructures in generalized Kolmogorov flow.
In: Physical Review Research. Vol. 3 (2021) Issue 2 . - No. L022010.
ISSN 2643-1564
DOI: https://doi.org/10.1103/PhysRevResearch.3.L022010

Abstract in another language

Self-organized large-scale flow structures occur in a wide range of turbulent flows. Yet, their emergence, dynamics, and interplay with small-scale turbulence are not well understood. Here, we investigate such self-organized turbulent superstructures in three-dimensional turbulent Kolmogorov flow with largescale drag. Through extensive simulations, we uncover their low-dimensional dynamics featuring transitions between several stable and metastable large-scale structures as a function of the damping parameter. The main dissipation mechanism for the turbulent superstructures is the generation of small-scale turbulence, whose local structure depends strongly on the large-scale flow. Our results elucidate the generic emergence and low-dimensional dynamics of large-scale flow structures in fully developed turbulence and reveal a strong coupling of large- and small-scale flow features.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics I > Chair Theoretical Physics I - Univ.-Prof. Dr. Michael Wilczek
Profile Fields > Advanced Fields > Nonlinear Dynamics
Result of work at the UBT: No
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 23 Feb 2022 15:21
Last Modified: 23 Feb 2022 15:21
URI: https://eref.uni-bayreuth.de/id/eprint/67604