Evolution of Near-Singular Jet Modes

The purpose of this contribution is to very briefly describe some simulations we have done concerning the evolution of modal disturbances to a planar jet in which the phase velocity of the perturbation is initially equal to the maximum jet velocity. For a more complete discussion of this work see Swaters (1999,2000). As is well known, the perturbation stream function for this configuration is algebraically singular at the jet maximum unlike the logarithmic singularity of a critical layer in a monotonic shear flow.