FERHAT, RabiaMERAHI, LeilaABED, BouabdellahBelabdi, Ali2019-05-272019-05-272018-12-10https://dspace.univ-eloued.dz/handle/123456789/1675International Symposium on Mechatronics and Renewable Energies El-Oued 10- 11 December 2018In the present work, a numerical simulation of turbulent flows, three-dimensional incompressible of a fluid through a 90° elbow square section, using a computing code ANSYS CFX that models the characteristics of the flow of fluids in complex geometries and using structured meshes. The general structure of the flow (hydrodynamic fields as well as the parameters of the turbulence) has been obtained for the Geometry considered, we have tested the performance of two models of k-ε turbulence and k-ω OSH, it proves that the model k-ω SST is more efficient meadows of wall that the k-ε model. the study confirms the existence of secondary flows to the interior and after the elbow. In fact, the flows at the level of Elbow are characterized by the presence of cells counter-rotating responsible on the disruption of the flow.enElbow, Turbulence, Secondary flow, counter - rotating cells.Other