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Related Experiment Videos

Passive scalar intermittency in compressible flow.

A Celani1, A Lanotte, A Mazzino

  • 1CNRS, Observatoire de la Côte d'Azur, Boîte Postale 4229, 06304 Nice Cedex 4, France.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|April 24, 2002
PubMed
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Compressibility enhances intermittency in passive scalar advection by slowing Lagrangian trajectory separations. This study confirms increased intermittency with greater compressibility in the direct cascade regime.

Area of Science:

  • Fluid dynamics
  • Turbulence theory
  • Statistical physics

Background:

  • The Kraichnan model describes passive scalar advection in turbulent flows.
  • Intermittency in scalar statistics is a key feature of turbulent systems.
  • Compressibility effects on turbulence are complex and require detailed investigation.

Purpose of the Study:

  • To investigate the dynamical role of compressibility on scalar intermittency.
  • To extend the Kraichnan model to include compressibility effects.
  • To analyze intermittency exponents in the direct cascade regime under varying compressibility.

Main Methods:

  • Numerical simulation of a compressible generalization of the Kraichnan model.
  • Lagrangian methods for calculating N-point tracer correlations.

Related Experiment Videos

  • Analysis of intermittency exponents as a function of compressibility.

    • Main Results:

    • Compressibility was found to enhance scalar intermittency.
    • Increased compressibility leads to a slowing down of Lagrangian trajectory separations.
    • Numerical results confirm the theoretical prediction of enhanced intermittency.

    Conclusions:

    • Compressibility plays a significant role in modifying scalar intermittency in turbulent flows.
    • The direct cascade regime exhibits enhanced intermittency with increasing compressibility.
    • The study provides quantitative insights into compressibility effects on turbulent scalar statistics.