A Predictive Framework for Flow Reversals and Excursions in Turbulence
ORAL
Abstract
We present a dynamical framework for intermittent reversals and excursions (R&Es) of large-scale circulations in turbulence.
We show that R&Es can arise when turbulent trajectories in phase space shadow invariant manifolds of certain unstable periodic orbits (UPOs).
Consequently, substantial flow reorganization and extreme fluctuations in flow metrics observed during R&Es can be reconstructed by splicing unstable manifolds of such dynamically relevant UPOs.
Using this geometrical framework, we predict imminent R&Es and preemptively avert these extreme events using closed-loop control.
We show that R&Es can arise when turbulent trajectories in phase space shadow invariant manifolds of certain unstable periodic orbits (UPOs).
Consequently, substantial flow reorganization and extreme fluctuations in flow metrics observed during R&Es can be reconstructed by splicing unstable manifolds of such dynamically relevant UPOs.
Using this geometrical framework, we predict imminent R&Es and preemptively avert these extreme events using closed-loop control.
*This work was supported by Startup Research Grant, IISc
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Presenters
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Balachandra Suri
- Indian Institute of Science Bangalore