Widely Applied Mathematics Seminars

Information-theoretic formulation of chaotic systems: causality, modeling and control

Adrian Lozano Duran, Draper Assistant Professor of Aeronautics and Astronautics, MIT

Mar 9, 2023

The problems of causality, modeling, and control for chaotic, high-dimensional dynamical systems are formulated in the language of information theory. The central quantity of interest is the Shannon entropy, which measures the amount of information in the states of the system. Within this framework, causality in the dynamical system is quantified by the information flux among the variables of interest. Reduced-order modeling is posed as a problem on the conservation of information, in which models aim at preserving the maximum amount of relevant information from the original system. Similarly, control theory is cast in information-theoretic terms by envisioning the tandem sensor-actuator as a device reducing the unknown information of the state to be controlled. The new formulation is applied to address three problems in the causality, modeling, and control of turbulence, which stands as a primary example of a chaotic, high dimensional dynamical system. The applications include the causality of the energy transfer in the turbulent cascade, subgrid-scale modeling for large-eddy simulation, and flow control for drag reduction in wall-bounded turbulence.

Speaker Bio

Adrian Lozano-Duran is the Draper Assistant Professor at MIT AeroAstro. He received his Ph.D. in Aerospace Engineering from the Technical University of Madrid in 2015. From 2016 to 2020, he was a Postdoctoral Research Fellow at the Center for Turbulence Research at Stanford University. His research is focused on physics and modeling of turbulent flows using transformative tools. 


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