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SUBGRID-SCALE ENSTROPHY TRANSFER IN TURBULENT WALL BOUNDED FLOWS

G. Hauet
Instituto Superior Tecnico, Pav. Mecanica I, 1o andar/LASEF, 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

Sinopsis

A-priori tests are carried out to analyse the SGS enstrophy transfer in turbulent channel ow. The SGS enstrophy transfer is negative (SGS enstrophy backscatter) in the viscous sublayer until y+~6, where it becomes positive (SGS enstrophy forward scatter). The maximum enstrophy dissipation is found to be located at about 8 wall units, where a strong correlation is detected between the highspeed streaks and the SGS enstrophy dissipation.