1. where
2. Consider the vortex sheet i n figure 3 as a rigid wall with vertical displacement y = n (x) = E sinax. On starting from the linearized equations of motion it i s easy to show that the pressure disturbances pl andp2associ
3. This work was supported by the Office of Naval Research under Grant No. NO0014-87-5-1 130. I n (A31 Ucl and Uc 2 are the mean flow velocities