f01_fall - Fluids Lecture 1 Notes 1 Introductory Concepts...

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Fluids – Lecture 1 Notes 1. Introductory Concepts and Definitions 2. Properties of Fluids Reading: Anderson 1.1 (optional), 1.2, 1.3, 1.4 Introductory Concepts and Definitions Fluid Mechanics and Fluid Dynamics encompass a huge range of topics which deal with the behavior of gasses and liquids. In UE we will focus mainly on the topic subset called Aerodynamics, with a bit af Aerostatics in the beginning. Merriam Webster’s definitions: Aerostatics: a branch of statics that deals with the equilibrium of gaseous fluids and of solid bodies immersed in them Aerodynamics: a branch of dynamics that deals with the motion of air and other gaseous fluids and with the forces acting on bodies in motion relative to such fluids Related older terms are Hydrostatics and Hydrodynamics, usually used for situtations in- volving liquids. There is surprisingly little fundamental difference between the Aero– and Hydro– disciplines. They differ mainly in the applications (e.g. airplanes vs. ships). Difference between a Solid and a Fluid (Liquid or Gas): Solid: Applied tengential force/area (or shear stress) τ produces a proportional de- formation angle (or strain) θ .
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