高解像度DNSによる平行平板間乱流熱伝達における各種乱流統計量に対するプラントル数の影響(<小特集>乱流研究の最前線)

概要

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Direct numerical simulation of turbulent heat transfer in a channel flow through high spatial resolution has been carried out for Re_τ=180, which is based on the friction velocity and the channel half width. The configuration is a fully developed turbulent channel flow with uniform heat flux heating from both walls. Molecular Prandtl numbers are set to be 0.71, 1.0, 2.0 and 10.0. The Prandtl number effect on the turbulence quantities such as turbulent Prandtl number, skewness and flatness factors of temperature derivatives are examined. Moreover, the resulting one-dimensional pre-multiplied energy spectra of temperature fluctuations at large wavenumbers are investigated to confirm the accuracy of the calculation.
社団法人日本機械学会の論文
2006-12-25