Journal of JSCE
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SIMULATING AIR-WATER GAS TRANSFER AT HIGH SCHMIDT NUMBER USING DYNAMICS OF OPEN-CHANNEL TURBULENCE
Yuji SUGIHARADaisuke NAKAGAWARyosuke TERAOKAKoji SHIONO
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Volume 4 (2016) Issue 1 Pages 52-58

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Abstract

 We propose a simple numerical method to describe the air-water gas transfer at high Schmidt number. A numerical simulation is carried out in terms of the advection-diffusion equation using interfacial velocities obtained from a direct numerical simulation of open-channel turbulent flow. The present numerical method can describe the high Schmidt number air-water gas transfer driven by turbulence dynamics of the open channel flow. The numerical results show that the surface divergence effectively promotes the interfacial gas flux. Characteristics of surface-renewal eddies, such as surface divergence and vorticities, are found on the basis of cross-correlation coefficients between the interfacial gas flux and turbulent quantities.

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© 2016 Japan Society of Civil Engineers
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