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Journal of the Brazilian Society of Mechanical Sciences

Print version ISSN 0100-7386

Abstract

MENDONCA, Márcio T; PAULEY, Laura L  and  MORRIS, Philip J. Effect of wave frequency on the nonlinear interaction between Görtler vortices and three-dimensional Tollmien-Schlichting waves. J. Braz. Soc. Mech. Sci. [online]. 2000, vol.22, n.1, pp. 69-82. ISSN 0100-7386.  http://dx.doi.org/10.1590/S0100-73862000000100006.

The nonlinear interaction between Görtler vortices (GV) and three-dimensional Tollmien-Schlichting (TS) waves nonlinear interaction is studied with a spatial, nonparallel model based on the Parabolized Stability Equations (PSE). In this investigation the effect of TS wave frequency on the nonlinear interaction is studied. As verified in previous investigations using the same numerical model, the relative amplitudes and growth rates are the dominant parameters in GV/TS wave interaction. In this sense, the wave frequency influence is important in defining the streamwise distance traveled by the disturbances in the unstable region of the stability diagram and in defining the amplification rates that they go through.

Keywords : Görtler vortices; Tollmien-Schlichting waves; boundary layer stability; instability; transition.

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