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Rotating turbulence under "precession-like" perturbation.

Kartik P Iyer1, Irene Mazzitelli2, Fabio Bonaccorso2

  • 1University of Rome and INFN, 00133, Tor Vergata Rome, Italy. iyerpkartik@gmail.com.

The European Physical Journal. E, Soft Matter
|December 6, 2015
PubMed
Summary
This summary is machine-generated.

Changing the rotation axis in homogeneous turbulence simulations alters energy flow. Sudden changes promote inverse cascades, while regular shifts lead to forward energy transfer and isotropic-like structures.

Keywords:
Topical Issue: Multi-scale phenomena in complex flows and flowing matter

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Area of Science:

  • Fluid Dynamics
  • Turbulence Research
  • Computational Physics

Background:

  • Homogeneous turbulence is fundamental in fluid dynamics.
  • Rotation significantly influences turbulent flows.
  • Understanding axis orientation effects is crucial for predicting turbulent behavior.

Purpose of the Study:

  • To investigate the impact of altering the rotation axis orientation on homogeneous turbulence.
  • To differentiate effects of instantaneous versus periodic axis reorientation.

Main Methods:

  • Direct numerical simulations (DNS) were conducted on a 1024^3 grid.
  • Two scenarios were simulated: (a) instantaneous axis change, (b) regular axis changes.

Main Results:

  • Instantaneous axis changes resulted in a dominant inverse energy cascade.
  • Regular axis changes hindered the inverse cascade, promoting forward energy transfer.
  • Recurrent axis shifts generated large-scale structures similar to isotropic turbulence.

Conclusions:

  • The timing and frequency of rotation axis changes critically affect energy transfer mechanisms in homogeneous turbulence.
  • DNS provides a powerful tool for exploring complex turbulent phenomena.