Experimental and numerical investigation of a strongly-forced precessing cylinder flow

Thomas Albrecht, Hugh M. Blackburn, Patrice Meunier, Richard Manasseh, Juan Lopez

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Planar particle image velocimetry (PIV) and direct numerical simulations (DNS) of the flow in a precessing cylinder of height-to-radius ratio of 1.835 are presented for a nutation angle of 15° and a Reynolds number 6430 based on the cylinder's angular frequency. We find excellent agreement in terms of time-averaged velocity profiles and Kelvin mode amplitudes during the initial development and in the asymptotic state. In the experiment, a rapid transition to a disordered state follows a brief appearance of azimuthal structures with a predominant wavenumber . m=9. In the DNS, the transition occurs later than in the experiment, and shows dominance of a triad of azimuthal wavenumbers . m=1,4,5 during the transient evolution. Adding a small random perturbation to the simulation after the forced mode is established accelerates transition to flow dominated by . m=9 which eventually transitions to a disordered state, consistent with observations from PIV. The breaking of rotoreflection (inversion) symmetry of the system is found to be critical in establishing evolution paths to the disordered and asymmetric asymptotic state.

Original languageEnglish (US)
JournalInternational Journal of Heat and Fluid Flow
DOIs
StateAccepted/In press - Dec 14 2015

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Keywords

  • DNS
  • Inertial waves
  • Instability
  • PIV
  • Precession
  • Symmetry breaking
  • Triadic resonance

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics
  • Fluid Flow and Transfer Processes

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