TED-AJ03-226 DNS of turbulent heat transfer in a channel flow with different thermal boundary conditions
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概要
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Direct numerical simulations (DNS's) have been performed on the turbulent heat transfer in a channel flow with an emphasis laid upon the effect of the thermal boundary condition. Two boundary conditions are applied; one is the constant temperature difference between the top and botton surfaces (CTD hereafter) and the other the uniform heat flux over both surfaces (UHF). A fully developed turbulent channel flow driven by a constant pressure gradient is assumed. Two Reynolds numbers of Re_γ=180 and 395 are calculated, where Re_γ is based on the friction velocity u_γ and the channel half width δ. Prandtl number of the fluid is 0.71. The buoyancy effect is not taken into consideration to examine the fundamental nature of the convective turbulent heat transfer. Finite difference method is employed with the fourth order accuracy in x and z directions and with the second order in y. To the authers' knowledge, this is the first attempt of the DNS with Re_γ=395 with the boundary condition of CTD. The temperature variance of UHF indicates a well known profile similar to that of the turbulent energy. On the other hand, the profile of CTD exhibits a maximum at the channel center (see Fig.A) previously proposed by Wikstrom & Johansson [8]. An interesting point found in the present study is that the maximum value at the center increases with the increase of Re_γ when scaled with the wall unit. A phenomenological consideration revealed, however, that the peak value will be saturated with further increase of Re_γ. Another peculiar point encountered in the present work is a non-similarity in the skewness factor between the velocity and scalar fluctuations. It is well known that, for UHF, these two skewness factors show a similar behaviour and become negative in the central region. In case of CTD, however, the skewness factor of the temperature variation stays in a positive value even in the central region (see Fig.B). The reason can be explained in consideration of the budget of the transport equation for the triple correlations.[figure]
- 一般社団法人日本機械学会の論文
著者
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Abe Hiroyuki
Computation And Network Infrastructure Laboratory National Aerospace Laboratory Of Japan
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Seki Yohji
Department Of Mechanical Engineering Tokyo University Of Science
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Kawamura Hiroshi
Department Of Biology Faculty Of Science Konan University
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Kawamura Hiroshi
Department Of Architecture And Civil Engineering Kobe University
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