Large-eddy simulation of transition in a separation bubble

In this paper, large-eddy, simulation of the transition process in a separation bubble is compared to experimental results. The measurements and simulations are conducted under low freestream turbulence conditions over a flat plate with a streamwise pressure distribution typical of those encountered on the suction side of turbine airfoils. The computational grid is refined to the extent that the simulation qualifies as a coarse direct numerical simulation. The simulations are shown to accurately capture the transition process in the separated shear layer The results of these simulations are used to gain further insight into the breakdown mechanisms in transitioning separation bubbles.