Fluid Flows: Description and Laws

This lecture focuses on the description of fluid flows, discussing the Eulerian versus Lagrangian approaches, specific field lines like stream lines, path lines, and streak lines, and the acceleration field. The instructor explains the Reynolds transport theorem, which relates the rate of change of a quantity in a Lagrangian system to the rate of change in an Eulerian system. The lecture emphasizes the importance of fundamental laws of physics, such as mass conservation, Newton's second law, and energy conservation, and how to reformulate them for a control volume to solve fluid mechanics problems.