DOI: 10.1016/j.watres.2018.06.067
Scopus记录号: 2-s2.0-85053051509
论文题名: Evaluation of three turbulence models in predicting the steady state hydrodynamics of a secondary sedimentation tank
作者: Gao H. ; Stenstrom M.K.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 143 起始页码: 445
结束页码: 456
语种: 英语
英文关键词: CFD modeling
; RNG k-ε and realizable k-ε model
; Secondary sedimentation tank
; Standard k-ε
; Turbulent flow
Scopus关键词: Computational fluid dynamics
; Forecasting
; Hoppers
; Hydrodynamics
; Sedimentation
; Semiconductor metal boundaries
; Settling tanks
; Turbulence models
; Turbulent flow
; CFD modeling
; Comprehensive comparisons
; Computational fluid dynamics methods
; Concentration patterns
; Physical quantities
; Secondary sedimentation tanks
; Solids concentrations
; Turbulent properties
; Activated sludge process
; activated sludge
; computational fluid dynamics
; concentration (composition)
; effluent
; hydrodynamics
; modeling
; numerical model
; optimization
; performance assessment
; sedimentation
; steady-state equilibrium
; suspended load
; turbulent diffusion
; turbulent flow
; activated sludge
; article
; calibration
; computational fluid dynamics
; effluent
; geometry
; height
; hydrodynamics
; prediction
; sedimentation
; steady state
; suspended particulate matter
; turbulent flow
英文摘要: The secondary sedimentation tank (SST) is a sensitive and complicated process in an activated sludge process. Due to the importance of its performance, computational fluid dynamics (CFD) methods have been employed to study the underflow hydrodynamics and solids distribution. Unlike most of the previous numerical studies, in the present investigation, the performance of three different types of turbulence models, standard k-ε RNG k-ε and Realizable k-ε are evaluated. Firstly, two-dimensional axisymmetric CFD models of two circular SSTs are validated with the field observations. Next, comprehensive comparisons are presented of the model predictions of the key physical quantities, such as the concentration of effluent suspended solids (ESS), and returned activated sludge (RAS), sludge blanket height (SBH), turbulent properties and flow and concentration patterns. A surprising result shows that the prediction of the ESS concentration is not sensitive to the change of turbulence models; while remarkable prediction difference can be observed in the inlet zone and near-field of sludge hopper and SBH. The results suggest that more observations inside the inlet zone are needed to achieve better model calibration and correct application of the turbulence model, which can be crucial to optimizing the geometry of inlet structure and sludge hopper as well as changing return solids concentration for the operation. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112573
Appears in Collections: 气候减缓与适应
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作者单位: Dept. of Civil and Environmental Engineering, University of California Los Angeles, 5714 Boelter Hall, Los Angeles, CA 90095, United States
Recommended Citation:
Gao H.,Stenstrom M.K.. Evaluation of three turbulence models in predicting the steady state hydrodynamics of a secondary sedimentation tank[J]. Water Research,2018-01-01,143