Flow regimes

In fluid dynamics, turbulence or turbulent flow is fluid motion exhibiting chaotic changes in pressure and flow velocity. It is in contrast to laminar flow, which occurs when a fluid flows in parallel layers with no disruption between those layers.

flow where fluid particles follow smooth paths in layers

flow of a viscous fluid in the space between two surfaces, one of which is moving tangentially relative to the other

compressible flow effect

adiabatic flow through a constant-area duct where the effect of friction is considered