J056064 2次元ポアズイユ流れにおける運動量と熱輸送の非相似性([J05606]乱流における運動量,熱,物質の輸送現象(6))

概要

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This study is conducted to investigate the dissimilarity between momentum and heat transfers in a turbulent flow. In a preceding report, it was shown from numerical results about a three-dimensional turbulent channel flow that the dissimilarity is strongly related to the spanwise vortex structure where Reynolds stress can be suppressed by the effect of wall-normal velocity and pressure gradient fluctuation correlation, (Yap/ax) . In this report, in order to understand the role of spanwise vorticity more clearly, a direct numerical simulation was performed to consider the dissimilarity in a two-dimensional Poiseuille flow in which the turbulent mixing is mainly dependent on the transverse vortex motion. A travelling wave pattern was observed with a cell structure in which a clock-wise vortex appears. In the cell averaged over the whole ensemble, the correlation (yap/ax) is noticeably reinforced near the vortex core and the turbulent heat flux overcomes Reynolds stress by 70 % at the maximum. The positive dissimilarity appears in the upstream of the vortex structure in a similar manner to the 3-D turbulent flow.
一般社団法人日本機械学会の論文
2011-09-11