Universality in the emergence of oscillatory instabilities in turbulent flows

Pavithran, I.; Unni, V. R.; Varghese, A. J.; Sujith, R. I.; Saha, A.; Marwan, Norbert; Kurths, Jürgen

doi:10.1209/0295-5075/129/24004

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Universality in the emergence of oscillatory instabilities in turbulent flows

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Pavithran, I.
External Organizations;

Unni, V. R.
External Organizations;

Varghese, A. J.
External Organizations;

Sujith, R. I.
External Organizations;

Saha, A.
External Organizations;

/persons/resource/Marwan

Marwan, Norbert
Potsdam Institute for Climate Impact Research;

/persons/resource/Juergen.Kurths

Kurths, Jürgen
Potsdam Institute for Climate Impact Research;

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Zitation

Pavithran, I., Unni, V. R., Varghese, A. J., Sujith, R. I., Saha, A., Marwan, N., Kurths, J. (2020): Universality in the emergence of oscillatory instabilities in turbulent flows. - EPL (Europhysics Letters), 129, 2, 24004.
https://doi.org/10.1209/0295-5075/129/24004

Zitierlink: https://publications.pik-potsdam.de/pubman/item/item_23938

Zusammenfassung

Self-organization driven by feedback between subsystems is ubiquitous in turbulent fluid mechanical systems. This self-organization manifests as emergence of oscillatory instabilities and is often studied in different system-specific frameworks. We uncover the existence of a universal scaling behaviour during self-organization in turbulent flows leading to oscillatory instability. Our experiments show that the spectral amplitude of the dominant mode of oscillations scales with the Hurst exponent of a fluctuating state variable following an inverse power law relation. Interestingly, we observe the same power law behaviour with a constant exponent near –2 across various turbulent systems such as aeroacoustic, thermoacoustic and aeroelastic systems.