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The turbulent cascade in five dimensions.

José I Cardesa1, Alberto Vela-Martín2, Javier Jiménez2

  • 1School of Aeronautics, Universidad Politécnica de Madrid, 28040 Madrid, Spain. ji.cardesa@upm.es.

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Summary
This summary is machine-generated.

Researchers identified a cross-scale energy link in turbulent flows. Fluid energy lumps appear at larger scales and dissipate at smaller scales, improving turbulence modeling for various fluid types.

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Area of Science:

  • Fluid dynamics
  • Turbulence research
  • Multiscale physics

Background:

  • Turbulent flows display energy dissipation across various scales.
  • Understanding energy cascade is crucial for geophysical and industrial flow modeling.

Purpose of the Study:

  • To detect and characterize the statistical predominance of cross-scale energy transfer in turbulent flows.
  • To offer insights for developing advanced turbulence models.

Main Methods:

  • Tracking fluid regions containing energy across different scales.
  • Analyzing the statistical predominance of energy transfer between scales (Δ, 2Δ, Δ/2).

Main Results:

  • Identified a predominant cross-scale link in energy transfer.
  • Observed fluid energy lumps appearing at scale 2Δ, existing at scale Δ, and dissipating at scale Δ/2.
  • Demonstrated the energy cascade in a water-like fluid.

Conclusions:

  • The study uncovers a key mechanism of the energy cascade in turbulent flows.
  • Findings provide fundamental insights for improving turbulence models.
  • The methodology can be extended to conducting fluids, quantum fluids, and plasmas.