Downstream boundary conditions for vertical jets

One of the more important fluid mechanics problems with a free surface is the analysis of the laminar flow of an imcompressible Newtonian liquid jet issuing from a circular nozzle into an inviscid gas phase. Considerable effort has been expended in recent years in obtaining numerical solutions to the complex set of nonlinear equations describing this flow field. The purpose of this note is to discuss the formulation of downstream boundary conditions for vertical Newtonian jets and to present some selected results for liquid jets under the influence of gravity.