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Related Experiment Videos

Large-scale finite-wavelength modulation within turbulent shear flows.

Arnaud Prigent1, Guillaume Grégoire, Hugues Chaté

  • 1CEA-Service de Physique de l'Etat Condensé, Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette, France.

Physical Review Letters
|July 5, 2002
PubMed
Summary

Turbulent spirals and spots in fluid flow match a Ginzburg-Landau model, indicating a new instability in homogeneous turbulence. This finding reveals patterns within chaotic fluid dynamics.

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Area of Science:

  • Fluid dynamics
  • Nonlinear dynamics
  • Statistical physics

Background:

  • Turbulent patterns like "spirals" and "spots" are observed in fluid systems such as Taylor-Couette and plane Couette flow.
  • Understanding the underlying mechanisms of these patterns is crucial for advancing fluid dynamics.
  • Existing models may not fully capture the complex dynamics of turbulent structures.

Purpose of the Study:

  • To identify the fundamental nature of turbulent "spirals" and "spots" in fluid flow.
  • To connect observed turbulent patterns with theoretical models.
  • To investigate potential instabilities in homogeneous turbulence regimes.

Main Methods:

  • Analysis of turbulent "spirals" and "spots" in Taylor-Couette and plane Couette flow.

Related Experiment Videos

  • Comparison with the phenomenology of coupled noisy Ginzburg-Landau equations.
  • Mathematical modeling of turbulence-intensity modulated finite-wavelength patterns.

    • Main Results:

    • Turbulent "spirals" and "spots" were shown to correspond to a turbulence-intensity modulated finite-wavelength pattern.
    • This pattern precisely fits the behavior of coupled noisy Ginzburg-Landau equations.
    • The findings suggest a previously unrecognized long-wavelength instability in homogeneous turbulence.

    Conclusions:

    • The observed turbulent structures are explained by a specific type of Ginzburg-Landau equation model.
    • A novel long-wavelength instability of homogeneous turbulence is proposed.
    • This research bridges experimental observations in fluid dynamics with nonlinear theoretical frameworks.