Direct Numerical Simulation of an Axially Rotating Pipe Flow (1st Report, Turbulent Statics for Low Rotation Rate)

摘要

A direct numerical simulations (DNS) of the fully developed axially rotating turbulent pipe flow was carried out. The Reynolds number, which is based on bulk velocity U_b and pipe diameter D, was set to be 5286, while rotating rates N= uφ｜w/U_b were 0.25, 0.30 and 0.35. The statistics obtained were the mean flow, the root-mean-square value of the fluctuating velocities, and the anisotropy invariant. It was found that the friction coefficient decreased with the rotation rate increase. Detailed distribu- tion of the turbulent kinetic energy and Reynolds stress budgets are also presented.