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VORTICITY STRUCTURES NEAR THE TURBULENT/NONTURBULENT INTERFACE IN A PLANAR TURBULENT JET

Ricardo J. N. dos Reis
Mechanical Engineering Department Instituto Superior Tecnico Av. Rovisco Pais, 1049-001 Lisboa Portugal

Carlos B. da Silva
Department of Mechanical Engineering (DEM) IDMEC/IST, Technical University of Lisbon Av. Rovisco Pais, 1049-001 Lisbon, Portugal

Jose C. F. Pereira
Mechanical Engineering Department Instituto Superior Tecnico Av. Rovisco Pais, 1049-001 Lisboa Portugal

Аннотация

The intense vorticity and the large vorticity structures are studied using a DNS of a turbulent planar jet. The structures are characterised in the jet regarding their radius, vorticity, tangential velocity, circulation and orientation in respect to the turbulent/nonturbulent interface. The variation of their characteristics with the distance to the Turbulent/Non-turbulent interface is also documented and their effect on this interface is described. A model is presented to explain the behaviour of the enstrophy viscous diffusion term at the Turbulent/Non-turbulent interface.