高等流体力学 讲义Chap07.pdf

Chapter 07: Boundary Layers 1. Boundary Layer Introduction 2. Boundary Layer Equations 3. Solution for Laminar Boundary Layer Flow Over a Flat Plate (Blasius’ Solution) 4. Falkner-Skan Solutions 5. Approximate Methods: The Kármán Momentum Integral Equation 6. Approximate Methods: Thwaites’ Correlation 7. Turbulent Boundary Layer over a Flat Plate 8. Boundary Layer Separation 9. Forces on Objects Immersed in a Fluid Flow C. Wassgren Page 1 of 48 Last Updated: 25 Nov 2003 1. Boundary Layer Introduction Boundary layers are the regions near a boundary in which rotational effects are significant. The various flow field regions are indicated in the figure below. outer, potential flow (irrotational flow, negligible viscous effects) typical streamline wake region (viscous forces negligible since velocity gradients are small, vorticity is convected in from the boundary layer) boundary layer thickness inner, boundary layer flow boundary layer (strong viscous effects, separation point