상하수도학회지 (Journal of Korean Society of Water and Wastewater)

  • 제25권5호
  • /
  • Pages.635-642
  • /
  • 2011
  • /
  • 1225-7672(pISSN)
  • /
  • 2287-822X(eISSN)
대한상하수도학회 (The Korean Society of Water and Wastewater)
권호 표지

정수지 내 추적자 실험과 CFD(전산유체역학)의 상관관계 분석

Case study comparisons of computational fluid dynamics modeling versus tracer test to evaluate the hydraulic efficiency of clearwell

  • 발행 : 2011.10.15
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

Hydraulic efficiency was a vital component in evaluating the disinfection capability of clearwell. Current practice evaluates these system based on the tracer test only. In this paper, CFD(Computational Fluid Dynamics) was applied on the clearwell for alternating or supplementing the tracer test. The baffle factor derived from the CFD modeling closely matched the values obtained from full scale tracer testing. And, for suggesting proper numerical model in clearwell; the turbulence model, discretization scheme, convergence criteria were investigated through separate simulation runs. The model validation was conducted by comparing the simulated data with experimental data. In the turbulence model, the realizable ${\kappa}-{\varepsilon}$ model and the standard ${\kappa}-{\varepsilon}$ model were found to be more appropriate than RNG ${\kappa}-{\varepsilon}$ model. The residuals of convergence criteria should be used as not $10^{-3}$ but $10^{-4}$ or $10^{-5}$. In discretization scheme, the difference of simulated values in 1st, 2nd, 3rd upwind scheme was found to be insignificant. Moreover, the result of this study suggest that CFD modeling can be a reliable alternative to tracer testing for evaluating the hydraulic efficiency.

키워드

참고문헌

  1. USEPA(1989) Drinking water; National primary drinking water regulations; Filtration, Disinfection; Turbidity, Giardia lamblia, Viruses, Legionella, and Heterotrophic bacteria; Final rule, 54(124)
  2. 환경부(2008) 정수처리기준등에 관한 규정(환경부 고시 제2008-60호)
  3. Bishop, M. et al.(1993) Improving the disinfection detention time of a water plant clearwell, J. AWWA, 85(3), 68-75
  4. Clark, M.M. et al.(1999) Improving clearwell design for CT Compliance, AWWARF
  5. Lousi Soracco(2009) Silver lake WTP clearwell Part 2 - the tracer study, NEWWA spring joint regional conference and exhibition
  6. Templeton, M.R., Hofmann, R. and Andrews, R.C.(2006) Case study comparisons of computational fluid dynamics modeling versus tracer testing for determining clearwell residence times in drinking water treatment, J. Environ. Eng. Sci., 5, 529-536 https://doi.org/10.1139/s06-007
  7. Li, J. et al.(2006) Application of computational fluid dynamics(CFD) to ozone contactor optimization, Water Science & Technology : Water Supply, 6(4), 9-16 https://doi.org/10.2166/ws.2006.905
  8. Canada Ontario EPA(2010) Strategies for minimizing the disinfection by products trihalomethanes and haloacetic acids, Ministry of Environment, Ontario, Canada
  9. US EPA(2006) Ultraviolet disinfection guidance manual for the final long term 2 Enhanced SWTR
  10. Patankar, S.V.(1980) Numerical heat transfer and fluid flow, Taylor & Francis
  11. Schiesser, W.E.(1991) The numerical method of lines : Integration of partial differential equations, Academic press Inc.
  12. Launder, B.E. and Spalding, D.B.(1974) The numerical computation of turbulent flows, Computer methods in applied mechanics and engineering, 3(2), 269-289 https://doi.org/10.1016/0045-7825(74)90029-2
  13. Adams, E.W., Rodi, W.(1990) Modeling flow and mixing in sedimentation tanks, J. Hydraul. Eng. 116(7), 895-913 https://doi.org/10.1061/(ASCE)0733-9429(1990)116:7(895)
  14. Rodi, W.(1980) Turbulence models and their application in hydraulics ; A state of the art review, IAHR, Delft, The Netherlands
  15. Patankar, S.V. and Spalding, D.B.(1972) A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows, Int. J. Heat Mass Transfer, 15, 147-163 https://doi.org/10.1016/0017-9310(72)90172-X
  16. Yakhot, V., Orszag, S.A., Thangam, S., Gatski, T.B. & Speziale, C.G.(1992) Development of turbulence models for shear flows by a double expansion technique, Physics of Fluids, 4(7), 1510-1520 https://doi.org/10.1063/1.858424