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Related Experiment Videos

Large-scale anisotropy in scalar turbulence.

Antonio Celani1, Agnese Seminara

  • 1INLN, CNRS, 1361 Route des Lucioles, 06560 Valbonne, France.

Physical Review Letters
|May 23, 2006
PubMed
Summary

Even small anisotropy in turbulent flow significantly impacts passive tracer transport, dominating concentration field structure at large scales. This finding applies broadly and is confirmed by analytical and numerical methods.

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Area of Science:

  • Fluid dynamics
  • Turbulence theory
  • Statistical mechanics

Background:

  • Turbulent flows are complex systems with inherent randomness.
  • Understanding passive tracer transport is crucial in various scientific fields.
  • Anisotropy, or directional dependence, can influence flow dynamics.

Purpose of the Study:

  • To investigate the impact of anisotropy on passive tracer statistics in turbulent flow.
  • To determine how anisotropy affects concentration fields at different scales.

Main Methods:

  • Analytical investigation using an exactly solvable model.
  • Numerical simulations of scalar transport in two-dimensional turbulence.

Main Results:

  • An arbitrarily small amount of anisotropy propagates to large scales.
  • Anisotropy eventually dominates the structure of the concentration field.
  • Results are consistent between analytical and numerical approaches.

Conclusions:

  • Anisotropy plays a critical role in shaping passive tracer concentration fields in turbulent flows.
  • The influence of anisotropy is scale-dependent, becoming dominant at large scales.
  • The findings are robust under broad conditions and validated by multiple methods.

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