TURBULENCE MODELING OF SOLUTE TRANSPORT IN OPEN-CHANNEL FLOWS OVER SUBMERGED VEGETATION
A model for numerical simulations of solute transport in vegetated open-channel flows is proposed. The Reynolds-Averaged Navier-Stokes model is used for the flow analysis. For the turbulence closure, the Reynolds stress model is used, and the generalized gradient diffusive hypothesis is used to close the Reynolds-averaged advection/diffusion equation. The developed model is applied to an experimental case of solute transport in turbulent open-channel flows over submerged vegetation reported by Ghisalberti and Nepf (2005). The simulated distributions of mean concentration along the streamwise direction are compared with measured data, showing a good agreement. In addition, numerical simulations reveal that the pattem of secondary currents in vegetated open-channel flows is significantly different from that in plain open-channel flows. Using the simulated results, the vertical turbulent Schmidt number for the vegetated open-channel flow is estimated and a value of 0.58 is obtained. This value can be compared to 0.47, which was obtained by Ghisalberti and Nepf (2005) using laboratory data.
solute transport secondary currents turbulent Schmidt number Reynolds stress model generalized gradient diffusion hypothesis
Hyeongsik Kang SungUk Choi
School of Civil & Environmental Engineering, Yonsei University, Shinchon-dong,Seodaemun-gu, Seoul 12 School of Civil & Environmental Engineering, Yonsei University, Shinchon-dong, Seodaemun-gu,Seoui 12
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
674-679
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）