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Fifth International Symposium on Turbulence and Shear Flow Phenomena
August, 27-29, 2007, Technische Universität München, Munich, Germany

DOI: 10.1615/TSFP5

NUMERICAL STUDY OF TURBULENT WAKES IN BACKGROUND TURBULENCE

pages 561-566
DOI: 10.1615/TSFP5.860
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RÉSUMÉ

Time-developing axisymmetric turbulent wakes with background turbulence are studied through Direct Numerical Simulation (DNS). A velocity field from turbulent wake and isotropic turbulence simulations have been fused together to produce the initial condition. Cases for which the background turbulence has a greater length scale than the wake are considered. Visualizations of the results are included along with plots showing how quickly the wake merges with the background. The turbulent background has a profound effect on the wake, which is not surprising, but the results here can help to quantify the effects. For example the stronger background has a greater effect on the wake, causing a reduction in the time taken for the wake and background to merge. Also, the effects of the background turbulence on some wake statistics only emerge after some time.

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