ABSTRAKT

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.