DNSによるエクマン境界層における乱流構造の研究(流体工学,流体機械)

概要

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The direct numerical simulations (DNSs) of the turbulent Ekman layer over a smooth flat surface are performed. The Reynolds numbers are set to be Re_f=400, 510 and 600 where Re_f is defined by Re_f=G/√<((νf)/2)> with use of the Geostrophic wind velocity G, kinematic viscousity ν and Coriolis parameter f. The result with a higher Reynolds number of 600 shows a logarithmic region. However the slope is quite different from that of the turbulent Poiseuille flow because of its three-dimensional nature. The characteristics of the streak structure in the vicinity of the wall and large-scale structure in far upper region are discussed based on the obtained statistics such as premultiplied energy spectra. The effect of Reynolds number onto the large-scale structure is also discussed.
一般社団法人日本機械学会の論文
2003-11-25