Small widths wall-attached Coandă jets for flow control

The flow dynamics of small widths wall-attached jets generated by a Coand\v{a} effect nozzle is investigated by URANS simulations. The data are validated by comparison to hot-wire velocity measurements performed on the same flow configurations. The jets exhibit a complex topology strongly influenced not only by the spanwise vorticity (as usually observed in wall jets) but also by a vorticity component normal to the wall and induced by the shear layer developing on the jet sides. This results in an original U-shaped jet whose characteristics are studied in detail for three different mass flow rates. The robustness of the flow topology on a larger range of injected mass flow rates is finally presented.