In the present work an analysis of the performance of three different turbulence models in the prediction of flows that present separation and reattachment. The turbulent flow was investigated through ducts with curvilinear obstructions. The selected models belong to the class of models with two differential equations k-e for low numbers of Reynolds. The objective of the analysis is to verify if these models are capable of capturing the recirculation areas and pressure recovery after the obstruction, fundamentals for the evaluation of the distribution of tensions. The fields of velocity, turbulent kinetic energy, dissipation rate obtained by the different models are compared with numeric and experiments data found in the literature, seeking to identify which is the model more adapted for those type of flows. The numeric determination of the fluid flows in the geometry with a curvilinear obstruction, described by a sine curve, was accomplished by a finite volume method with non orthogonal curvilinear coordinates which adapt to the geometry. The countervariants velocity components was employed as independent variables in the momentum conservation equation and the velocity-pressure coupling was solved by the SIMPLEC algorithm . Among all the tested models, none was able to reproduce exactly the experimental data. However, the LSH model, proposed by Launder and Sharma (1974) with the modification proposal for Hanjalic and Launder (1980) presented the best performance, which can be considered satisfactory.