Lecture 09 Notes - EGN 3353C Fluid Mechanics Chapter 4:...

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EGN 3353C Fluid Mechanics Lou Cattafesta MAE Dept. University of Florida Chapter 4: Fluid Kinematics Lecture 9 ± In order to calculate forces exerted by moving fluids, we must be able to describe the dynamics mathematically o To do this, we must be able to describe the motion (i.e., displacement, velocity, and acceleration) Æ called kinematics o 2 Methods of Description Lagrangian Æ keep track of individual, identifiable elements of fixed mass as a function of time (system approach) Æ in fluid mechanics, this “particle tracking” approach would be a bookkeeping nightmare due to huge number of molecules in region of interest and small distance between molecular collisions Example: Air @ STP Æ 66 nm l Eulerian Æ we draw a control surface that bounds a control volume. Flux of mass, momentum, energy, etc. across the boundary of control volume. Here, we keep track of points in space as a function of time (x,y,z,t) Æ field approach
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EGN 3353C Fluid Mechanics Lou Cattafesta MAE Dept. University of Florida ± What is the difference between the Lagrangian vs. Eulerian descriptions?
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This note was uploaded on 08/17/2011 for the course EGN 3353C taught by Professor Lear during the Spring '07 term at University of Florida.

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Lecture 09 Notes - EGN 3353C Fluid Mechanics Chapter 4:...

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