Flow Classifications

This lecture covers different classifications and examples of flow, including stationary versus transient flows, two-dimensional versus three-dimensional flows, perfect versus real fluids, laminar versus turbulent flows, and compressible versus incompressible flows. The instructor explains how to classify flows based on their characteristics, such as the stability of velocity, the presence of fluctuations, and the effects of compressibility and viscosity. Various examples, such as flow around a cylinder and the formation of vortices, are used to illustrate these concepts. The lecture also touches on the distinction between fluid and solid behavior, the concept of viscosity, and the behavior of Newtonian and non-Newtonian fluids under different stress conditions.