Abstract
We carried out a direct numerical simulation of open-channel flow with wind shear stress to investigate numerically the effect of the wind stress on the air-water gas transfer. The numerical results show the wind shear to affect significantly turbulent eddies close to the air-water interface. Spatial patterns of the surface divergence and the interfacial gas flux are stretched in the wind direction,and the similarity between both patterns is found to decrease with increase of the wind stress. The cross-correlation coefficients between the gas flux and the spanwise vorticity are also obviously changed by the presence of the wind stress. The gas transfer velocity in this case doesn't agree with the solution of the surface divergence model. This suggests that the other dynamical mechanism promotes the gas transfer at the wind-sheared interface.
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Schedule a callMore From: Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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