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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...
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When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
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Preferential turbulence enhancement in two-dimensional compressions.

Seth Davidovits1, Nathaniel J Fisch2

  • 1Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

Physical Review. E
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PubMed
Summary

Two-dimensional compression of initially isotropic turbulence can lead to anisotropic energy distribution. This phenomenon may enable enhanced turbulent energy growth and increased turbulent Mach numbers, even without thermal losses.

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Area of Science:

  • Fluid Dynamics
  • Turbulence Research
  • Computational Physics

Background:

  • Understanding the behavior of turbulence under compression is crucial in various scientific fields.
  • Isotropic turbulence, where properties are the same in all directions, simplifies theoretical models but is less common in natural phenomena.

Purpose of the Study:

  • To investigate the effects of two-dimensional compression on initially isotropic three-dimensional turbulence.
  • To analyze the energy distribution and dynamics of turbulent flow components under such compression.

Main Methods:

  • Numerical simulations were employed to model the behavior of turbulence.
  • The study focused on compressions applied along two dimensions of a three-dimensional turbulent flow.

Main Results:

  • Two-dimensional compression leads to anisotropic energy distribution, with energy accumulating in the compressed directions.
  • The nonlinearity of hydrodynamic equations is insufficient to maintain isotropy under these conditions.
  • Turbulent energy growth can be stronger and more sustained compared to three-dimensional compressions.

Conclusions:

  • The study highlights the significant impact of anisotropic compression on turbulent energy dynamics.
  • An increasing turbulent Mach number is observed even in compressions without thermal losses.
  • Findings suggest potential for enhanced energy transfer and dissipation mechanisms in anisotropic turbulent flows.