Propagating helical waves as a building block of round turbulent jets

Journal article (2018)

Authors

Rustam Mullyadzhanov Novosibirsk State University, Institute of Thermophysics SB RAS
Richard D. Sandberg University of Melbourne
Sergey S. Abdurakipov Novosibirsk State University, Institute of Thermophysics SB RAS
W. K. George Imperial College London
K. Hanjalic Novosibirsk State University, ChemE/Transport Phenomena - AS
Research Group
ChemE/Transport Phenomena (AS) (TU Delft)
Copyright: © 2018 R. I. Mullyadzhanov, R. D. Sandberg, S. S. Abdurakipov, W. K. George, K. Hanjalic
DOI: https://doi.org/10.1103/PhysRevFluids.3.062601
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Published Date

2018

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Transport Phenomena

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.