Abstract
Large eddy simulation was performed for flow and heat transfer under stable density stratification in a wavy wall channel to reveal the effect of stratification on turbulent structures. Low-Mach-number approximation was applied to treat density variation. The iso-surface of instantaneous temperature in the middle of the channel shows that the effect of stable stratification is strong and greatly reduces turbulence there. On the other hand, instantaneous structures and two-point correlations near the wavy wall suggest that characteristic near-wall structures and their scales are not strongly affected by the extent of stratification in spite of considerable reduction of turbulent intensity.
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