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Schlagwörter:
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Zusammenfassung:
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.
