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Propagating helical waves as a building block of round turbulent jets

R. I. Mullyadzhanov, R. D. Sandberg, S. S. Abdurakipov, W. K. George, and K. Hanjalić
Phys. Rev. Fluids 3, 062601(R) – Published 14 June 2018
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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.

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  • Received 21 February 2017

DOI:https://doi.org/10.1103/PhysRevFluids.3.062601

©2018 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

R. I. Mullyadzhanov1,2,*, R. D. Sandberg3, S. S. Abdurakipov1,2, W. K. George4, and K. Hanjalić2,5

  • 1Institute of Thermophysics SB RAS, Lavrentyeva 1, Novosibirsk 630090, Russia
  • 2Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russia
  • 3University of Melbourne, Victoria 3010, Australia
  • 4Imperial College of Science, Technology and Medicine, London SW7 2AZ, United Kingdom
  • 5Delft University of Technology, Building 58, Van der Maasweg 9, 2629 HZ Delft, The Netherlands

  • *rustammul@gmail.com

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Issue

Vol. 3, Iss. 6 — June 2018

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