Large eddy simulations of turbulent mixing layers excited with two frequencies

In this study, we investigate the energy transfer during the pairing and merging process of two vortices into one in an excited turbulent mixing layer using Large Eddy Simulations. We present simulations of natural and periodically excited mixing layers for validation purposes and study the vortex pairing dynamics by exciting the mixing layer by two frequencies. The results help in understanding the effects of the energy transfer in the long-wave turbulent spectrum and assessing the role of backscatter.