Articles | Volume 23, issue 2
Nonlin. Processes Geophys., 23, 83–89, 2016
https://doi.org/10.5194/npg-23-83-2016

Special issue: Complex environmental and geophysical turbulence

Nonlin. Processes Geophys., 23, 83–89, 2016
https://doi.org/10.5194/npg-23-83-2016

Research article 04 Apr 2016

Research article | 04 Apr 2016

Dual-plane PIV investigation of acoustically excited jets in a swirl nozzle

Gavita S. Regunath et al.

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Short summary
Helical structures are commonplace in geophysical flows, but their effect on turbulence is still enigmatic. A novel PIV laser technique has been used to analyze helical structures in a turbulent swirling jet where the underlying shear flow is subjected to external acoustic forcing. Although the acoustic excitation had an effect on the flow field, no evidence for the existence of large-scale helical structures with maximal helicity was found.