One of the main objectives of the European project Eurolift 2 is to develop numerical simulation tools that can deal with high-lift wing configurations at takeoff or landing. Among the many difficulties to be handled are the inclusion of aeroelasticity (wing deformation under load), pertinent geometric details (attachments of the slat and of the flaps), regions of flows separation at approach to stall, and laminar-turbulent transition. This last question has to be considered because of the low approach velocities as well as the reduced dimensions of the slat and flaps, which limits the local Reynolds number with respect to cruise conditions. Conceming transition, the high-lift context calls for modeling the contamination of the attachment line, the relaminarization, and the transition due to the growth of instabilities or to the presence of a separation bubble.
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