Abstract
Three-dimensional Direct Numerical Simulation (DNS) is applied to a wind-driven air-water two-phase flow, and the turbulence structure in boundary layers on both gas and liquid sides near the air-water interface is investigated in detail. The results show that the behaviors of the turbulence structure on the gas side and shear stress and pressure acting on the interface are similar to those over rigid wavy walls. On the other hand, turbulent motions on the liquid side are strongly affected by orbital motion of wind-wave. Beneath the interface of the leeward side of the wind-wave, mean vertical velocity without orbital motion shows negative value and turbulence intensities become large. These suggest that the scalar transfer tends to be enhanced in this region.
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