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. As wind turbines grow larger, the use of flatbackairfoils has become standard practice for the root region of the blades.Flatback profiles provide higher lift and reduced sensitivity to soiling atsignificantly higher drag values. A number of flow control devices have beenproposed to improve the performance of flatback profiles. In the presentstudy, the flow past a flatback airfoil at a chord Reynolds number of1.5×106 with and without trailing edge flow control devicesis considered. Two different numerical approaches are applied, unsteadyReynolds-Averaged Navier Stokes (RANS) simulations and detached eddysimulations (DES). The computational predictions are compared against windtunnel measurements to assess the suitability of each method. The effect ofeach flow control device on the flow is examined based on the DES results onthe finer mesh. Results agree well with the experimental findings and showthat a newly proposed flap device outperforms traditional solutions forflatback airfoils. In terms of numerical modelling, the more expensive DESapproach is more suitable if the wake frequencies are of interest, but thesimplest 2D RANS simulations can provide acceptable load predictions.

The flow past a flatback airfoil with flow control devices: benchmarking numerical simulations against wind tunnel data