Studies of nonparallel stability of boundary layer

In this article the nonparallel stability of the boundary layer is investigated effectively by using the parabolized stability equations (PSE). With the coordinate transformation, the finitely expanded out-boundary condition, and the finite difference technique in both x-coordinate and y-coordinate, the evolution of Tollmien-Schlichting waves are presented which are comparable with the Orr-Sommerfeld equations (OSE) results and PSE results by spectral method.