Thermal convection is ubiquitous in nature as well as in many industrial applications. The identification of effective control strategies to, e.g., suppress or enhance the convective heat exchange under fixed external thermal gradients is an outstanding fundamental and technological issue. In this work, we explore a novel approach, based on a state-of-the-art Reinforcement Learning (RL) algorithm, which is capable of significantly reducing the heat transport in a two-dimensional Rayleigh-B\'enard system by applying small temperature fluctuations to the lower boundary of the system. By using numerical simulations, we show that our RL-based control is able to stabilize the conductive regime and bring the onset of convection up to a Rayleigh number $Ra_c \approx 3 \cdot 10^4$, whereas in the uncontrolled case it holds $Ra_{c}=1708$. Additionally, for $Ra > 3 \cdot 10^4$, our approach outperforms other state-of-the-art control algorithms reducing the heat flux by a factor of about $2.5$. In the last part of the manuscript, we address theoretical limits connected to controlling an unstable and chaotic dynamics as the one considered here. We show that controllability is hindered by observability and/or capabilities of actuating actions, which can be quantified in terms of characteristic time delays. When these delays become comparable with the Lyapunov time of the system, control becomes impossible.


    Zugriff

    Download


    Exportieren, teilen und zitieren



    Titel :

    Controlling Rayleigh-Bénard convection via Reinforcement Learning


    Beteiligte:

    Erscheinungsdatum :

    31.03.2020


    Anmerkungen:

    Beintema , G , Corbetta , A , Biferale , L & Toschi , F 2020 , ' Controlling Rayleigh-Bénard convection via Reinforcement Learning ' , arXiv , vol. 2020 , 2003.14358 . < https://arxiv.org/abs/2003.14358 >


    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :

    DDC:    629



    Competing Instabilities in Rayleigh-Benard Convection

    Branover, Herman / Mond, Michael / Unger, Yeshajahu | AIAA | 1988



    Linear Stability Analysis of Magnetic Rayleigh-Benard Convection

    Morimoto, H. / Maekawa, T. / Ishikawa, M. et al. | British Library Conference Proceedings | 1998


    Oscillatory instabilities of two-layer Rayleigh-Marangoni-Benard convection

    Liu, Q. S. / Zhou, B. H. / Liu, R. et al. | British Library Conference Proceedings | 2006


    Rayleigh–Bénard Power-Law Fluid Convection in Rectangular Enclosures

    Yigit, Sahin / Chakraborty, Nilanjan | AIAA | 2017