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Hydrodynamics are the study of fluids in motion.
a dam
M. Ungarish has written:
'Hydrodynamics of suspensions' -- subject(s): Centrifugation, Hydrodynamics, Suspensions (Chemistry)
Hydrodynamics is not a concept used on cars, as it is the study of the behavior of water on an object, I suppose you mean aerodynamics.
Jean-Pierre Boon has written:
'Molecular hydrodynamics' -- subject(s): Hydrodynamics, Molecular dynamics