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The dynamics of unconfined, spatially developing shear layers is studied by numerical solutions of the time-dependent Euler equations using a second-order Godunov scheme. Effects of density and velocity variations between the two streams of the shear layer are studied and color graphics is used to show more clearly the entrainment process of the surrounding streams. The calculations demonstrated that the evolution of the mean flow was dominated by two-dimensional, inviscid effect.s. The I.m.s. fluctuating velocity and density profiles were found to be in good agreement with the measurements of Oster and \\'ygnanski and of Konrad, except for the peak value of the v' profile.

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