Four turbulence models,namely,the basic and nonlinear stress-transport models and the basic and anisotropic k-ε models,have been tested in thecase of interaction between a longitudinal vortex pair and a flat-plate boundary layer.The results of their predictions were compared with Mehta and Bradshaw’s measure-ments.In this paper,part of the results involving those of the nonlinear stress-transport model and anisotropic k-ε model are presented and discussed. Four turbulence models, namely, the basic and nonlinear stress-transport models and the basic and anisotropic k-ε models, have been tested in the case of interaction between a longitudinal vortex pair and a flat-plate boundary layer. The results of their predictions were compared with Mehta and Bradshaw’s measure-ments. In this paper, part of the results involving those of the nonlinear stress-transport model and anisotropic k-ε models are presented and discussed.