Mike Gaster ([email protected])
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Transcript of Mike Gaster ([email protected])
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Mike Gaster ([email protected])
Boundary layer perturbations created by various boundary value excitations
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),(),,( txvtxu to be imposed on the wall
![Page 3: Mike Gaster (m.gaster@qmul.ac.uk)](https://reader034.fdocument.pub/reader034/viewer/2022051401/56812aad550346895d8e7334/html5/thumbnails/3.jpg)
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Velocity perturbations created by a periodic source
![Page 5: Mike Gaster (m.gaster@qmul.ac.uk)](https://reader034.fdocument.pub/reader034/viewer/2022051401/56812aad550346895d8e7334/html5/thumbnails/5.jpg)
![Page 6: Mike Gaster (m.gaster@qmul.ac.uk)](https://reader034.fdocument.pub/reader034/viewer/2022051401/56812aad550346895d8e7334/html5/thumbnails/6.jpg)
Phase locked velocity fluctuations on a smooth plate excited by a periodic point source
C Calculation Measurement
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Perturbation Created by u(0) = δ(x)
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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.
![Page 10: Mike Gaster (m.gaster@qmul.ac.uk)](https://reader034.fdocument.pub/reader034/viewer/2022051401/56812aad550346895d8e7334/html5/thumbnails/10.jpg)
Skin friction from a periodic point source
Re = 1000 Free-stream velocity =12.6m/s
Frequency = 150 Hz
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Fast-nearfield.exeFast-nearfield.exe
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Flow over a sinusoidal ripple
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![Page 15: Mike Gaster (m.gaster@qmul.ac.uk)](https://reader034.fdocument.pub/reader034/viewer/2022051401/56812aad550346895d8e7334/html5/thumbnails/15.jpg)
Phase locked velocity fluctuations on a smooth plate excited by a periodic point source
C Calculation Measurement