【简答题】The Internationa1 Space Station allows astronauts to live in space for extended amounts of time, enabling them to explore the outside universe and conduct many experiments. However, nothing like that ...
【简答题】已知光滑平板紊流边界层内的流速分布的对数律公式为 u x /u ﹡ =A+BIn(u ﹡ /ν) 令上式中的A=Blna,则 u x /u ﹡ =Bln(au ﹡ y/ν) 由上式不难看出,当y=0时,u x ≠0而是等于-∞,因而无法使用y=0的边界条件,为了弥补这个缺陷,将上式改写成 u x /u ﹡ =Bln(1+αu ﹡ y/ν) 上式中能满足y=0时,u x =0的条件,且在对数式...