Numerical models of flow control in jets

A series of computational experiments is discussed where a submerged round jet is subjected to different ways of active flow control to achieve the effect of jet splitting. The first method is to superimpose axial and helical excitations onto the velocity profile at the jet inlet. The second one consists of mechanical vibration of the jet inlet nozzle added to axial forcing. Both methods result in jet splitting at Reynolds numbers Re above 1000. At lower Re, the splitting is not guaranteed and requires pinpointing the optimal forcing frequencies and amplitudes to produce a meaningful effect.