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Journal Article

Universality of oscillatory instabilities in fluid mechanical systems


Morales,  Vladimir Garcia
External Organizations;

Tandon,  Shruti
External Organizations;


Kurths,  Jürgen
Potsdam Institute for Climate Impact Research;

Sujith,  R. I.
External Organizations;

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Morales, V. G., Tandon, S., Kurths, J., Sujith, R. I. (2024): Universality of oscillatory instabilities in fluid mechanical systems. - New Journal of Physics, 26, 033005.

Cite as: https://publications.pik-potsdam.de/pubman/item/item_29690
Oscillatory instability emerges amidst turbulent states in experiments in various turbulent fluid and thermo-fluid systems such as aero-acoustic, thermoacoustic and aeroelastic systems. For the time series of the relevant dynamic variable at the onset of the oscillatory instability, universal scaling behaviors have been discovered in experiments via the Hurst exponent and certain spectral measures. By means of a center manifold reduction, the spatiotemporal dynamics of these real systems can be mapped to a complex Ginzburg–Landau equation with a linear global coupling. In this work, we show that this model is able to capture the universal behaviors of the route to oscillatory instability, elucidating it as a transition from defect to phase turbulence mediated by the global coupling.