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Related Experiment Videos

Drag reduction by polymer additives in decaying turbulence.

Chirag Kalelkar1, Rama Govindarajan, Rahul Pandit

  • 1Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560012, India. kalelkar@physics.iisc.ernet.in

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 11, 2005
PubMed
Summary

This study numerically investigates decaying turbulence in polymer solutions, defining drag reduction and revealing new insights into polymer energy spectra and turbulent intermittency.

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Area of Science:

  • Fluid Dynamics
  • Polymer Physics
  • Computational Physics

Background:

  • Turbulence in dilute polymer solutions exhibits complex dynamics.
  • Understanding drag reduction mechanisms is crucial for various applications.
  • Previous studies have not fully characterized the interplay between polymers and turbulence decay.

Purpose of the Study:

  • To systematically study decaying turbulence in dilute polymer solutions using a computational model.
  • To define and analyze drag reduction in this specific turbulent regime.
  • To uncover novel aspects of polymer behavior and energy transfer within turbulence.

Main Methods:

  • Utilized a shell-model version of the finitely extensible nonlinear elastic (FENE) and Peterlin equations.
  • Conducted systematic numerical simulations of decaying turbulence.

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  • Compared results with the Gledzer-Ohkitani-Yamada (GOY) shell model for fluid turbulence.

    • Main Results:

    • Presented a novel definition for drag reduction in decaying turbulence.
    • Observed and analyzed the potential-energy spectrum of the polymer.
    • Identified previously unobserved features in the temporal evolution of the kinetic-energy spectrum.
    • Characterized intermittency in polymer-laden turbulent flows.

    Conclusions:

    • The FENE-Peterlin shell model provides valuable insights into polymer-turbulence interactions.
    • The study offers a new perspective on drag reduction in decaying turbulence.
    • New data on polymer energy spectra and intermittency contribute to fundamental understanding.