Influences of a Rippled Surface on Growth Rates of Tollmien-Schlichting Waves

The goal of this study is a numerical investigation of the effect of rippled surfaces on transition of laminar-wing flow by Tollmien- Schlichting (TS) waves. This will provide a numerical tool for the prediction of dominating physical mechanisms. Numerical studies of different accuracy and effort are expected, starting from linear stability theory (LST) in comparison with direct simu- lations of TS-waves, basic studies of flat plate with sinusoidal perturbations of small amplitude and large wave-length, as well as spacial investigations of TS-modes on a laminar profile with realistic surface-waviness.