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Artificial intelligence control of a turbulent jet

Abstract : An artificial intelligence (AI) control system is developed to manipulate a turbulent jet with a view to maximizing its mixing. The system consists of sensors (two hot-wires), genetic programming for learning/ evolving and execution mechanism (6 unsteady radial minijets). Mixing performance is quantified by the jet centerline mean velocity. AI control discovers a hitherto unexplored combination of flapping and helical forcings. Such a combination of several actuation mechanisms-if not creating new ones-is practically inaccessible to conventional methods like a systematic parametric analysis and gradient search, and vastly outperforms the optimized periodic axisymmetric, helical or flapping forcing produced from conventional open-or closed-loop controls. Intriguingly, the learning process of AI control discovers all these forcings in the order of increased performance. The AI control has dismissed sensor feedback and multi-frequency components for optimization. Our study is the first highly successful AI control experiment for a non-trivial spatially distributed actuation of a turbulent flow. The results show the great potential of AI in conquering the vast opportunity space of control laws for many actuators and sensors and manipulating turbulence.
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https://hal.archives-ouvertes.fr/hal-02398705
Contributor : Bernd Noack <>
Submitted on : Saturday, December 7, 2019 - 9:44:41 PM
Last modification on : Wednesday, October 14, 2020 - 3:41:44 AM

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  • HAL Id : hal-02398705, version 1

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Dewei Fan, Yu Zhou, Bernd Noack. Artificial intelligence control of a turbulent jet. 21st Australasian Fluid Mechanics Conference, Dec 2018, Adelaide, Australia. ⟨hal-02398705⟩

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