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Turbulent Flow01:24

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Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent spots,...
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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
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Published on: February 27, 2016

Turbulence-condensate interaction in two dimensions.

H Xia1, H Punzmann, G Falkovich

  • 1Physical Sciences and Engineering, Australian National University, Canberra ACT 0200, Australia.

Physical Review Letters
|December 31, 2008
PubMed
Summary
This summary is machine-generated.

A spectral condensate in thin fluid layers alters turbulence. This large-scale flow affects velocity moments across many scales, potentially resolving energy flux debates in atmospheric turbulence.

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Last Updated: Jun 26, 2026

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Area of Science:

  • Fluid Dynamics
  • Turbulence Research
  • Atmospheric Science

Background:

  • Turbulence in thin fluid layers is influenced by large-scale coherent flows, known as spectral condensates.
  • Understanding the impact of these condensates on turbulence statistics is crucial for various scientific fields.

Purpose of the Study:

  • To experimentally investigate how a spectral condensate modifies turbulence in thin fluid layers.
  • To analyze the effects on second and third-order velocity moments and velocity flatness.

Main Methods:

  • Experimental generation of turbulence in thin fluid layers.
  • Inclusion of a large-scale coherent flow (spectral condensate).
  • Measurement and analysis of velocity moments and flatness across different scales.

Main Results:

  • The spectral condensate modifies the third-order velocity moment over a broader scale range than the second-order moment.
  • A sign change in the third moment within the inverse cascade was observed.
  • The presence of the condensate was found to increase velocity flatness.

Conclusions:

  • The spectral condensate significantly impacts turbulence statistics, particularly the third-order velocity moment.
  • Subtracting the coherent flow's influence is necessary for accurate energy flux calculations in mesoscale atmospheric turbulence.
  • Findings contribute to resolving controversies regarding energy flux measurements in atmospheric studies.