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Structure of turbulence in temporal planar jets

Cimarelli, A., Fregni, A., Mollicone, J.-P., van Reeuwijk, M. and De Angelis, E. 2022. Structure of turbulence in temporal planar jets. Physics of Fluids 34 (4) , 045109. 10.1063/5.0085091

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Abstract

A detailed analysis of the structure of turbulence in a temporal planar turbulent jet is reported. Instantaneous snapshots of the flow and three-dimensional spatial correlation functions are considered. It is found that the flow is characterized by large-scale spanwise vortices whose motion is felt in the entire flow field. Superimposed to this large-scale motion, a hierarchy of turbulent structures is present. The most coherent ones take the form of quasi-streamwise vortices and high and low streamwise velocity streaks. The topology of these interacting structures is analyzed by quantitatively addressing their shape and size in the different flow regions. Such information is recognized to be relevant for a structural description of the otherwise disorganized motion in turbulent free-shear flows and can be used for the assessment of models based on coherent structure assumptions. Finally, the resulting scenario provides a phenomenological description of the elementary processes at the basis of turbulence in free-shear flows.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Engineering
Publisher: American Institute of Physics
ISSN: 1070-6631
Date of First Compliant Deposit: 27 May 2022
Date of Acceptance: 20 March 2022
Last Modified: 29 May 2022 16:12
URI: https://orca.cardiff.ac.uk/id/eprint/149407

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