From N-S equations to flow models

摘要

The suitability of N-S equations and the soruces of misconceptions in flow models are idscussed here. Some of points of view are: (1) some part of established flowfield around, whether with or without boundary layer, is specious, (2) the torsion deformation of streamline features the generation of vortex, (3) at separation point the shear stress is not zero, but avoids the danger to be zero there, (4) inherent in turbulence is not randomness but strict orderliness just that causes its randomness in motion.