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. Published under an exclusive license by AIP Publishing.

Structure of turbulence in temporal planar jets / Cimarelli A.; Fregni A.; Mollicone J.-P.; Van Reeuwijk M.; De Angelis E.. - In: PHYSICS OF FLUIDS. - ISSN 1070-6631. - STAMPA. - 34:4(2022), pp. 045109.1-045109.12. [10.1063/5.0085091]

Structure of turbulence in temporal planar jets

De Angelis E.
2022

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. Published under an exclusive license by AIP Publishing.
2022
Structure of turbulence in temporal planar jets / Cimarelli A.; Fregni A.; Mollicone J.-P.; Van Reeuwijk M.; De Angelis E.. - In: PHYSICS OF FLUIDS. - ISSN 1070-6631. - STAMPA. - 34:4(2022), pp. 045109.1-045109.12. [10.1063/5.0085091]
Cimarelli A.; Fregni A.; Mollicone J.-P.; Van Reeuwijk M.; De Angelis E.
File in questo prodotto:
File Dimensione Formato  
Accepted_PoF8.pdf

accesso aperto

Tipo: Postprint
Licenza: Licenza per accesso libero gratuito
Dimensione 7.41 MB
Formato Adobe PDF
7.41 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/965710
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 2
social impact