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Updated: Dec 31, 2025

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
Published on: February 22, 2018
Observability of laminar bidimensional fluid flows seen as autonomous chaotic systems
Gisela D Charó1, Denisse Sciamarella2, Sylvain Mangiarotti3
1Laboratorio de Fluidodinámica, Facultad de Ingeniería, Universidad de Buenos Aires, CONICET, C1063ACV CABA, Argentina.
Abstract:
Lagrangian transport in the dynamical systems approach has so far been investigated disregarding the connection between the whole state space and the concept of observability. Key issues such as the definitions of Lagrangian and chaotic mixing are revisited under this light, establishing the importance of rewriting nonautonomous flow systems derived from a stream function in autonomous form, and of not restricting the characterization of their dynamics in subspaces. The observability of Lagrangian chaos from a reduced set of measurements is illustrated with two canonical examples: the Lorenz system derived as a low-dimensional truncation of the Rayleigh-Bénard convection equations and the driven double-gyre system introduced as a kinematic model of configurations observed in the ocean. A symmetrized version of the driven double-gyre model is proposed.
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