Two modes of jet formation in fluid flow out of a slit

Two types of fluid outflow into a submerged space are considered: (1) a mode of outflow with a jet front on which a spiral structure is present and (2) a mode of outflow with a smooth jet front. The asymptotic behavior of the solution at the connection point of the ends of a vortex sheet is examined for the second mode. A numerical solution to the self-similar problem is presented. It is shown that both modes of outflow occur in specific ranges of the parameters of the problem: the discharge coefficient and the self-similarity index.