Closed-loop adaptive control of extreme events in a turbulent flow
Name
PhysRevE.100.033110.pdf
Description
Published version
Size
993.39 KB
Format
Adobe PDF
Checksum (MD5)
95b6b23a7b07050e5c994aa58ebf86bb
Author(s)
Farazmand, Mohammad
Sapsis, Themistoklis P
Date Issued
2019
Journal
Physical Review E
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
Extreme events that arise spontaneously in chaotic dynamical systems often have an adverse impact on the system or the surrounding environment. As such, their mitigation is highly desirable. Here, we introduce a control strategy for mitigating extreme events in a turbulent shear flow. The controller combines a probabilistic prediction of the extreme events with a deterministic actuator. The predictions are used to actuate the controller only when an extreme event is imminent. When actuated, the controller only acts on the degrees of freedom that are involved in the formation of the extreme events, exerting minimal interference with the flow dynamics. As a result, the attractors of the controlled and uncontrolled systems share the same chaotic core (containing the nonextreme events) and only differ in the tail of their distributions. We propose that such adaptive low-dimensional controllers should be used to mitigate extreme events in general chaotic dynamical systems, beyond the shear flow considered here.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1103/PHYSREVE.100.033110
