Propagating helical waves as a building block of round turbulent jets

R. I. Mullyadzhanov, R. D. Sandberg, S. S. Abdurakipov, W. K. George, K. Hanjalić

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Turbulent jets are known to support large-scale vortical wave packets traveling downstream. We show that a propagating helical wave represents a common form of the "optimal" eigenfunction tracking these structures from the near to the far field of a round jet issuing from a pipe. Two first mirror-symmetric modes containing around 5% of the total turbulent kinetic energy capture all significant large-scale events and accurately replicate the full shear-layer dynamics of the azimuthal wave number m=1. A family of the most energy-containing traveling waves represents low wave numbers and is described in terms of "empirical" dispersion laws.

Original languageEnglish
Article number062601
Number of pages9
JournalPhysical Review Fluids
Volume3
Issue number6
DOIs
Publication statusPublished - 14 Jun 2018

Keywords

  • COHERENT STRUCTURES
  • INITIAL CONDITIONS
  • AXISYMMETRICAL JET
  • REYNOLDS-NUMBER
  • FIELD
  • FLOW
  • MODES
  • DYNAMICS
  • VELOCITY

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