Ejection mechanisms in the sublayer of a turbulent channel

Abstract

The structure of the vorticity field in the viscous wall layer of a turbulent channel is studied by examining the results of a fully resolved direct numerical simulation. It is shown that this region is dominated by intense three-dimensional shear layers in which the dominant vorticity component is spanwise. The advection and reproduction processes of these structures are examined and shown to be consistent with the classical generation mechanism for two-dimensional Tollmien–Schlichting waves. This process is fundamentally different from the usually accepted mechanism involving hairpin vortices.

Keywords

MechanicsTurbulenceVorticityVortexAdvectionLaminar sublayerPhysicsChannel (broadcasting)Classical mechanicsFlow separationThermodynamicsEngineeringTelecommunications

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Publication Info

Year: 1988
Type: article
Volume: 31
Issue: 6
Pages: 1311-1313
Citations: 45
Access: Closed

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APA Style

                            
                                
                                    Javier Jiménez, 
                                
                                    Parviz Moin, 
                                
                                    Robert Moser
                                
                                et al.
                            
                            (1988). 
                            Ejection mechanisms in the sublayer of a turbulent channel. 
                            The Physics of Fluids
                            , 31
                            (6)
                            , 1311-1313.
                            https://doi.org/10.1063/1.866721
                        

Identifiers

DOI: 10.1063/1.866721