3d nozzles employing the apparatus and method may be embodied as shown in fig5 the convergent inlet portion 61 and divergent outlet portion 62 of nozzle 64 have corresponding geometric relationships to the 2d embodiments described with a total angle of less than 150 u00b0 created by convergence angle of the inlet portion is greater than 18 u00b0 and divergence angle 22 of the outlet portion greater than 12 u00b0 multiple injection inlets 66 with associated feed conduits 68 are provided around the circumference of the diverging outlet portion of the nozzle eight inlets at 45 u00b0 spacing are shown as examples however four inlets at 90 u00b0 spacing or a greater number of inlets for refined control of wall separation by the jet may be employed multiple sets of injection inlets may be spaced along the length of the diverging outlet portion to accommodate multiple design operating conditions of the jet operation of the embodiments disclosed herein is summarized in fig6 a nozzle with convergent inlet and divergent outlet is provided in step 802 with preliminary determination of a desired total angle and convergence and divergence angles to achieve desired flow performance in step 800 disturbance generators such as inlet flow slots vibrating membranes or sonic impulse generators are located substantially symmetrically oppositely at a predetermined length along the divergent outlet portion of the nozzle in step 804 and the magnitude of the disturbance created by the generators is controlled to create a non shock induced separation of the flow from the wall of the divergent outlet portion to create a separation zone extending substantially from the nozzle throat to the nozzle.