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John A. Redford
School of Engineering Sciences, University of Southampton, Highfield, Southampton, SO17 1BJ, UK

Gary N. Coleman
School of Engineering Sciences, University of Southampton Highfield, Southampton, Hampshire, SO17 1BJ, UK


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.