Hydraulics & Fluid Mechanics
Two dimensional flow occurs when

the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
the magnitude and direction of the velocity do not change from point to point in the fluid
the direction and magnitude of the velocity at all points are identical
the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

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Hydraulics & Fluid Mechanics
Fluid is a substance that

cannot remain at rest under action of any shear force
always expands until it fills any container
cannot be subjected to shear forces
has the same shear stress.at a point regardless of its motion

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