GENERATION OF TOLLMIEN-SCHLICHTING WAVES BY HARMONIC EXCITATION

The creation of wavy disturbances (Tollmien-Schlichting waves) by a lo calized two-dimensional disturbance source vibrating periodically at a fixed frequency in a Blasius boundary layer is discussed. The initial -boundary value problem mathematically models the vibrating ribbon exp eriment of Schubauer and Skramstad. By considering the ribbon vibratio n to start at t=0, in the model one gets the transient and the eventua l periodic part of the solution. The results of the full simulation ar e compared with the time-asymptotic solution.