Compare the features of hydrostatic and hydrodynamic pumps.
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✳️Hydrostatic systems transfer energy by pressure, and the fluid is static with respect to the piston or surface it pushes against. The oil and piston of course are moving through space, but are relatively static with respect to each other. A given drop of oil basically 'pushes' to transfer energy.
Examples: gear/vane/piston pumps or motors, hydraulic cylinders.
Hydrodynamic systems transfer energy by relative motion and momentum exchanging between oil and object. One is moving more than the other, and its momentum or motion causes the other to accelerate/decelerate, thus transfering energy. Basically, the system 'throws' a bit of fluid with mass and velocity against a vane or impellor with less velocity and the energy from f=ma transfers to the impellor blades as a motor. Or, the impellor has more velocity and it transfers energy by F=MA to the fluid and vane acts as a pump. Examples: centrifugal pumps, fans, fluid torque convertors.
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