separated flows wakes and cavities olivier cadot, equipe dynamique des fluides et acoustique de...
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Separated FlowsWakes and Cavities
Olivier Cadot, Equipe Dynamique des Fluides et Acoustique de l’Unité de Mécanique, ENSTA, Palaiseau.
OverviewShort serie of 4 lectures
Application fields : naval research, aerodynamics of salient bodies (cars, lorries… ), geophysical flows (island wakes)...
Streamlines that do not follow the solid body
attached flow
•Complex wake structure and dynamics
• Consequence on drag and lift
separated flow
Bluff body wakes at large Reynolds numbers
circular cylinder
Re=102.
Bluff body wakes at large Reynolds numbers
Square cylinder
Re=104.
Bluff body wakes at large Reynolds numbers
Car (real scale Re = 5 106)
Car, lorries, trains Re>106.
Car (scale 1/8)
Bluff body wakes at large Reynolds numbers
Island wakes
Re>108.
Bluff body wakes at large Reynolds numbers
airfoils
Re>106.
Vapor and gaz cavities in liquids at large Re
• Cavity size
• Local pressure, drag and lift
• Cavity dynamic
• Super-cavities, ventilated wake.
Cavitating blade
Cavitating plate wake
Super-cavitation
Lecture plan
• 12th december.
• 19th december.
• 9th january at ENSTA Palaiseau, fluid mechanics facilities
• 16th january at ENSTA Palaiseau, fluid mechanics facilities .
• Examination : to be defined.
absent from 4th feb to 13th may
• Generalities
• Separation in context of the B.L.T.
• 2D Bluff body flows
• Free streamline flow theory
• Cavitation
ENSTA Cavitation Tunnel
lecture room D105
meeting in front of the main entrance
The SOURCES /
Articles from <1970 + some recent reviews
Books :