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Related Experiment Videos

Transient vortex events in the initial value problem for turbulence.

D D Holm1, Robert Kerr

  • 1T-Division and CNLS, MS-B284, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|June 13, 2002
PubMed
Summary
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A study on turbulence found that helical vortex structures precede energy cascade signatures. Understanding this coherent mechanism is key for accurate large-eddy simulations of turbulent flows.

Area of Science:

  • Fluid dynamics
  • Turbulence research
  • Computational physics

Background:

  • Turbulent flows exhibit complex dynamics, including bursting events.
  • Vorticity dynamics play a crucial role in energy transfer within turbulence.
  • Helical structures are observed in turbulent systems, but their precise role is debated.

Purpose of the Study:

  • To investigate a specific vorticity surge event as a potential paradigm for turbulence bursting.
  • To characterize the coherent mechanism underlying this event.
  • To analyze the role of helicity in the early stages of turbulent energy cascades.

Main Methods:

  • Analysis of a specific vorticity surge event in a turbulent flow.
  • Examination of vortex configurations in physical and Fourier space.

Related Experiment Videos

  • Comparison of different large-eddy simulations (LES) to assess modeling impacts.

    • Main Results:

    • The studied event features intrinsically helical vortex configurations at peak vorticity.
    • Nonhelical, antiparallel vorticity elements were not observed during the event.
    • This helical structure precedes traditional energy cascade signatures like increased dissipation and spectral changes.

    Conclusions:

    • The observed helical vorticity surge is a significant coherent mechanism in turbulence.
    • This mechanism precedes the development of energy cascade phenomena.
    • Accurate modeling of nonlinear energy and helicity transport is crucial for LES of turbulence.