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Influence of density fluctuation on DNS of turbulent channel flow in the presence of temperature stratification

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.550
pages 297-300

Takashi Ohta
Department of Mechanical Engineering, Osaka University, Yamadaoka, Suita, Osaka 565-0871; Department of Mechanical Engineering, University of Fukui, Bunkyo, Fukui 910-8507, Japan

K. Mizobata
Department of Mechanical Engineering, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan

Takeo Kajishima
Department of Mechanical Engineering, Osaka University, 2-1 Yamada-oka, Suita-city, Osaka 565-0871 Japan

Abstract

To improve the accuracy of turbulent heat transfer prediction, we propose a new method which indicates the effect of density variation. In the present study, the direct numerical simulation(DNS) of turbulent flow in a horizontal channel of different wall temperature is carried out by using the method. As a result of the density fluctuation in near-wall eddies, asymmetric profiles are observed in turbulence statistics. This tendency has not been reproduced by the Boussinesq approximation based on the constant density formulation. By the 4-quadrant analysis of turbulent shear stress, it is found that the ejection events in the vicinity of the walls are particularly affected by the density variation. The results suggest that the present method is potent in simulating the change in heat transfer rate due to density fluctuation in a more practical flow field.

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