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SCALE-BY-SCALE ENERGY AND TEMPERATURE VARIANCE BUDGETS IN A TURBULENT MIXING LAYER

Lyazid Djenidi
Discipline of Mechanical Engineering, University of Newcastle, Newcastle, 2308, NSW, AUSTRALIA

Robert Anthony Antonia
Discipline of Mechanical Engineering, University of Newcastle, Newcastle, 2308, NSW, AUSTRALIA

S. Rajagopalan
Department of Mechanical Engineering, University of Newcastle. University Drive, Callaghan, NSW, 2308

Sinopsis

Velocity and temperature measurements are carried out in a mixing layer of a heated turbulent round jet with the aim of investigating how the large scale vortical structures that characterize the mixing layer affect both the energy and scalar variance transport terms. The assessment is performed through the measurements of the second and third-order velocity and temperature structure functions.
Compared with the jet centreline, the structure functions for both velocity and temperature are altered in the mixing layer. The modification is consistent with the presence of large scale coherent structures in the mixing layer. For example, the approach to the limiting value of 2 for the second-order structure functions, which is monotonic on the jet centreline, undergoes an oscillation in the mixing layer. An oscillation is also observed for the third-order structure functions in the mixing layer. The scale-by-scale energy budgets suggest that the non-homogeneity in the mixing layer contributes more to the budget than on the jet centreline.