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Two-Dimensional Numerical Simulation of Primary Settling Tanks by Hybrid Finite Analytic Method |
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| Authors: | Bai-Cang Liu Jun Ma She-Hua Huang Da-Hong Chen Wen-Xue Chen |
| Affiliation: | 1Ph.D. Candidate, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China. E-mail: baicangliu@yahoo.com.cn 2Professor, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China (corresponding author). E-mail: majun@hit.edu.cn 3Professor, State Key Laboratory of Water Resources and Hydropower Engineering, Wuhan Univ., Wuhan, Hebei 430072, China. E-mail: huangsh@public.wh.hb.cn 4Associate Professor, State Key Laboratory of Water Resources and Hydropower Engineering, Wuhan Univ., Wuhan, Hebei 430072, China. E-mail: dhchen@whu.edu.cn 5Associate Professor, Dept. of Hydraulics Research, China Institute of Water Resources and Hydropower Research, Beijing 100038, China. E-mail: wenxuechen@sina.com |
| Abstract: | In order to investigate the turbulent flow and mass transfer in primary settling tanks, numerical simulations are conducted by using a modified k?ε two-layer model based Boussinesq’s approximation to model the Reynolds stress in primary settling tanks, and solving the governing equations using a hybrid finite analytic method (HFAM). The simulation results obtained using the mathematical model are compared with the experimental data and simulation results available in the literature, and the results of comparison indicate that the profiles of the primary velocity field are in line with the experimental results and the flow-through curve obtained using the mathematical model are in good agreement with the curves based on experimental data. It is therefore concluded that the HFAM approach can be used to simulate the turbulent flow and mass transfer in a primary settling tank, and the modified k?ε two-layer model can be used to establish the velocity field distribution at the bottom of a primary settling tank. |
| Keywords: | Sedimentation tanks Hydrodynamics Turbulent flow Two-dimensional models Simulation Hybrid methods |