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