When is a flow compressible? compressible flow differs from an incompressible one in that significant change happens in the density

Boundary layer(边界层) Although frictional effects in slightly viscous fluid are indeed present, they are confined to a thin layer near the surface of the body, and the rest of the flow can be considered inviscid. (1904, Prandt/)

Chapter 1 Introduction 1.1 Preliminary Remarks When you think about it, almost everything on this planet either is a fluid or moves within or near a fluid. -Frank M. White What is a fluid?

§1 内积、欧氏空间 Rn §2 标准正交基 §3 R3中向量的向量积与混合积

§1 线性方程组的Gauss消元法 §2. 线性方程组解的结构 §3 解线性方程组的一个应用

§14-1地下建筑工程测量概述 §14-2 地面控制测量 一、平面控制测量 （一）直线定线法 二、导线测量法 三、三角网法 四、全球定位系统法 二、高程控制测量 §14-3隧道施工测量 §14-4 竖井联系测量

§1 二元一次方程组的求解 §2 n阶行列式 §3 行列式的性质与行列式的展开 §4 克莱姆法则

Chapter 10&11 Rotational Motion Angular Quantities Torque Angular Momentum Conservation of Angular Momentum

北京钢铁学院：专利项目（1985部分）

Chapter 8 Energy and Conservation Law 1. Work and Energy 2. Kinetic Energy(能)&work- Energy Principle 3. Conservative(保守) and Noncons Forces 4. Potential Energy(势能) 5. Conservation Snarav