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Mike Gaster (m.gaster@qmul.ac.uk) ‏

Boundary layer perturbations created by various boundary value excitations. Mike Gaster (m.gaster@qmul.ac.uk) ‏. to be imposed on the wall. Velocity perturbations created by a periodic source. Phase locked velocity fluctuations on a smooth plate excited by a periodic point source.

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Mike Gaster (m.gaster@qmul.ac.uk) ‏

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  1. Boundary layer perturbations created by various boundary value excitations Mike Gaster (m.gaster@qmul.ac.uk)‏

  2. to be imposed on the wall

  3. Velocity perturbations created by a periodic source

  4. Phase locked velocity fluctuations on a smooth plate excited by a periodic point source C Calculation Measurement

  5. Perturbation Created by u(0) = δ(x)

  6. We can choose appropriate boundary values to model various physical situations:- jets issuing from a slit or from a point set at an angle to the flow – either steady or unsteady, an isolated bump, 2-D or 3-D, steady or unsteady, a periodic roughness ripple, random roughness, moving roughness. Transfer function for active control.

  7. Re = 1000 Free-stream velocity =12.6m/s Frequency = 150 Hz Skin friction from a periodic point source

  8. Flow over a sinusoidal ripple

  9. Phase locked velocity fluctuations on a smooth plate excited by a periodic point source C Calculation Measurement

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