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

Результат исследования: Научные публикации в периодических изданияхстатья

8 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаанглийский
Номер статьи062601
Число страниц9
ЖурналPhysical Review Fluids
Том3
Номер выпуска6
DOI
СостояниеОпубликовано - 14 июн 2018

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