[zdunol]

Hi, this question regards fluid dynamics in general not cfd, if I shouldn't post in here then I am sorry :c

I am wondering why and if reducing inlet diameter to some volume (rectangular cavity for example) would result in different (higher?) turbulence. First answer is obvious - for constant volumetric flow rate and reduced inlet diameter velocity must go up and therefore Reynolds number and turbulence will go up. However Reynolds number is a ratio of inertia and viscous forces and they do not depend on inlet diameter (amount of momentum is constant i think). I wonder if this is related to Kolmogorov's spectrum of energy(where energy density drops with eddies size growth), but I do not understand this concept to much, so I am not sure.