G102 乱流場における熱と運動量輸送の非相似性に関する研究(GS-1 乱流1,一般セッション)

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  • G102 Dissimilarity between Heat and Momentum transfers in Turbulent Flow

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The influence of transverse vorticity on the dissimilarity between turbulent heat flux and Reynolds stress was investigated by using the result of direct numerical simulation. The dissimilarity can be strengthened by the transverse vorticity ω_z because the correlation between wall-normal velocity and pressure gradient in the flow direction becomes noticeable in the region with strong ω_z. The swirl motion with the axis in the spanwise direction can be extracted in the turbulent flow field by use of the condition proposed in this study. A strong dissimilarity can be recognized in such region, especially in the upstream of the vortex center. The transverse vortex should be responsible for the dissimilarity in the turbulent flow, since the contribution to the overall dissimilarity is concentrated and is roughly 150% in the region with the swirl motion.

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