When the limits of wings and rudders are pushed to their performance limits, complicated three-dimensional separations are common. Traditional models like Reynolds Averaged Navier Stokes Simulations (RANSS) often fail to model these cases well, especially if flow control is used to extend the performance range. Recent efforts demonstrating massively parallel, adaptive finite element simulations will be presented to illustrate what Detached Eddy Simulation (DES) can provide will be shown and compared with experiments.