Numerical solution of three-dimensional rectangular submerged jets with evidence of the undisturbed region of flow

The evolution of turbulent rectangular submerged free jets has been investigated numerically with a two-dimensional approach, [1], by using the Large Eddy Simulations (LES) at several Reynolds numbers. The average numerical results confirmed the presence of the undisturbed region of flow, URF, located between the slot exit and the beginning of the potential core region, PCR, previously observed experimentally at the University of Rome “Tor Vergata”. The two-dimensional study, [1], carried out under the conditions previously investigated in the literature, showed that the URF has a self-similar behavior, and proposed a new law for the evolution of the momentum. The present paper extends the Large Eddy Simulations (LES) to three-dimensional rectangular submerged free jets, showing that the self-similar behavior of URF is present also in the three-dimensional numerical simulations, as well as in the PCR and in the fully developed region, FDR