Question 1
In low-speed aerodynamic reasoning, why is the fluid often treated as incompressible when the speed is small compared with the speed of sound?
Question 2
Which quantity is most commonly used to judge whether compressibility effects are important in low-speed aerodynamics?
Question 3
What is the main purpose of a boundary layer in low-speed flow analysis?
Question 4
Why can viscous effects matter even when the fluid speed is low?
Question 5
Which statement best describes the drag on a body in low-speed flow when viscous effects are significant?
