コリオリの力が作用する低レイノルズ数二次元チャネル発達乱流の速度分布

概要

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Mean velocity distributions of fully developed turbulent flow have been measured in two-dimensional stationary and rotating channels under low-Reynolds number range. The turbulent structures receive Coriolis force effect as well as low-Reynolds-number effect. Three parameters Re^*, Ωv/u^2_* and ΩD/u_* (two of which are independent) where u_*, D and Ω are friction velocity, channel half width and rotating angular velocity, respectively, are sufficient to describe these effects on the velocity distribution. The changes from the conventional log and defect laws are well described by these parameters. A Coriolis region where the Coriolis length scale, u_*/Ω, predominates is experimentally confirmed to exist. On the suction side of a rotating channel, the turbulent structure of the wall region is similar to that on the stationary channel, while it differs on the pressure side.
一般社団法人日本機械学会の論文
1993-02-25