Journal article

Large-scale eddies and their role in entrainment in turbulent jets and wakes

Jimmy Philip, Ivan Marusic

PHYSICS OF FLUIDS | AMER INST PHYSICS | Published : 2012

Abstract

A large-scale or energy-containing eddy model of turbulent axisymmetric jets and wakes is developed, wherein eddies are randomly distributed in the azimuthal and convecting in the axial directions. The mean velocities and second order statistics obtained from the models agree well with the various available experimental data. There is an average inflow into the turbulent jet at the boundary, which is virtually non-existent for wakes. These eddy contributions are used to reconsider the entrainment process, which has to date been largely conceived as either an "engulfment" or "nibbling" process. Here we suggest that entrainment in turbulent jets be viewed as a three-part-process wherein non-tu..

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Grants

Funding Acknowledgements

The authors wish to thank Professor Ronald J. Adrian for discussions on the entrainment process. The Australian Research Council is gratefully acknowledged for its financial support.