EMERGENCE OF OBLIQUE TS MODE DUE TO LONGITUDINAL WALL OSCILLATION IN 2D CHANNEL FLOW
Session: Instability and Transition 1
Session starts: Tuesday 25 August, 10:30
Presentation starts: 11:30
Room: Room B
Takashi Atobe (Japan Aerospace Exploration Agency)
Stabilizing effects of wall oscillation on two dimensional (2D) Tollmein-Schlichting (TS) waves and oblique TS waves developing in 2D channel flow are numerically investigated using the Floquet method. It was shown from the previous study that the wall oscillation mostly has stabilizing effect and then TS mode is occasionally more stable than the oblique mode. In the present study the characteristics of the stability are investigated in detail. Then it is cleared that the exchange of the most unstable mode form the 2D TS to the oblique TS can occur at a certain value of Reynolds number.