Aquatic environment

Application of computational fluid dynamic to model the hydraulicperformance of subsurface flow wetlands


FAN Liwei , Hai Reti , WANG Wenxing , LU Zexiang , YANG Zhiming

DOI:

Received January 10, 2008,Revised May 23, 2008, Accepted , Available online

Volume 20,2008,Pages 1415-1422

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A subsurface flow wetland (SSFW) was simulated using a commercial computational fluid dynamic (CFD) code. The constructed media was simulated using porous media and the liquid resident time distribution (RTD) in the SSFW was obtained using the particle trajectory model. The e ect of wetland configuration and operating conditions on the hydraulic performance of the SSFW were investigated. The results indicated that the hydraulic performance of the SSFW was predominantly a ected by the wetland configuration. The hydraulic e ciency of the SSFW with an inlet at the middle edge of the upper media was 0.584 and the best among the SSFWs with an inlet at the top, the middle, and the bottom edge of the upper media. The constructed media a ected the hydraulic performance by the ratio (K) of the upper and lower media resistance. The selection of appropriate media resistance in the protection layer can improve the hydraulic e ciency. When the viscous resistance coe cient of the media in the protection layer changed from 2.315 105 to 1.200 108, the hydraulic e ciency of the SSFW increased from 0.301 to 0.751. However, the e ect of operating conditions on the hydraulic e ciency of the SSFW was slight.

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