Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Three-Dimensional Computational Modeling of Scour around Pile Groups

군말뚝 주변의 세굴 3차원 수치모의

  • Kim, Hyung Suk (River and coastal Research Division, Korea Institute of Civil Engineering and Building Technology) ;
  • Park, Moonhyeong (River and coastal Research Division, Korea Institute of Civil Engineering and Building Technology)
  • 김형석 (한국건설기술연구원 하천해안연구실) ;
  • 박문형 (한국건설기술연구원 하천해안연구실)
  • Received : 2014.06.17
  • Accepted : 2014.09.22
  • Published : 2014.10.31
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Abstract

This study presents scour processes and its characteristics around the pile groups using the large eddy simulation (LES) coupled with sediment transport and morphodynamic models. The scour and deposition around pile groups were significantly influenced by the pile interval. In case the non-dimensional pile interval was less than 3.75, the local scours as well as the contraction scour were observed around the pile group. On the other hand, in case the non-dimensional pile interval was more than 3.75, the contraction scour disappeared and only local scours were developed at individual piles. Change in the scour depth at piles located in the upstream was similar with the case of single pile, but the scour depth around piles located in the downstream was lower and showed a significantly different tendency due to the presence of piles in the upstream. The non-dimensional maximum scour depth around the pile group decreased as the pile interval increased.

본 연구는 LES와 유사이동 모형을 이용하여 군말뚝 주변 세굴과정 및 특성의 수치모의에 관한 내용이다. 군말뚝 주변에서 세굴 및 퇴적은 말뚝간격에 크게 영향을 받았다. 무차원 말뚝간격이 3.75보다 작은 경우에는 군말뚝 주변 국부세굴 뿐만 아니라 단면축소세굴이 발생하였다. 반면 무차원 말뚝간격이 3.75 이상이면 단면축소세굴은 사라지고 각각의 말뚝에서 국부세굴만발생하였다. 상류에 위치한 말뚝에서 세굴 심변화는 단일 말뚝의 경우와 유사한 경향을 보였지만 하류에 위치한 말뚝근처에서 세굴심은 상류말뚝 존재 때문에 세굴심이 낮게 나타났고 경향성도 상당히 다름을 보였다. 군말뚝 주변의 무차원 최대 세굴심은 말뚝간격이 증가할수록 감소하였다.

Keywords

References

  1. Ataie-Ashtiani, B., and Beheshti, A.A. (2006). "Experimental investigation of clear-water local scour at pile groups." Journal of Hydraulic Engineering, Vol. 132, No. 10, pp. 1100-1104. https://doi.org/10.1061/(ASCE)0733-9429(2006)132:10(1100)
  2. Choi, H.K., Baek, K.W., Koo, B.S., and Choi, Y.M. (2001). "An Experimental study on the scour characteristics based on shape and arrangement of the piers." Journal of Korean Society of Civil Engineers, Vol. 21, No. 4, pp. 409-415 (in Korean).
  3. Dargahi, B. (1990). "Controlling mechanism of local scouring." Journal of Hydraulic Engineering, Vol. 116, No. 10, pp. 1197-1214. https://doi.org/10.1061/(ASCE)0733-9429(1990)116:10(1197)
  4. De Ruiter JCC. (1993). Incipient motion and pick-up of sediment as function of local variables. Technical Report R 657-XI, Delft Hydraulics Laboratory, Delft, Netherlands.
  5. Escauriaza, C., and Sotiropoulos, F. (2011). "Initial stages of erosion and bed form development in a turbulent flow around a cylindrical pier." Journal of Geophysical Research, Vol. 116, F03007.
  6. Ettem, R., Kirkil, G., and Muste, M. (2006). "Similitude of large-scale turbulence in experiments on local scour at cylinders." Journal of Hydraulic Engineering, Vol. 132, No. 1, pp. 33-39. https://doi.org/10.1061/(ASCE)0733-9429(2006)132:1(33)
  7. Hannah, C.R. (1978). Scour at pile groups. Research Report. No 28-3, Civil Engineering Dept. Univ. of Canterbury, Christchurch, New Zealand.
  8. Khosronejad, A., Kang, S., and Sotiropoulos, F. (2012). "Experimental and computational investigation of local scour around bridge piers." Advance in Water Resources, Vol. 37, pp. 73-85. https://doi.org/10.1016/j.advwatres.2011.09.013
  9. Kirkil, G., Constantinescu, G., and Ettema, R. (2009). "Detached eddy simulation investigation of turbulence at a circular pier with scour hole." Journal of Hydraulic Engineering, Vol. 135, No. 11, pp. 888-901. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000101
  10. Lee, S.O., Lee, J.W., and Cho, Y.S. (2006). "Temporal variation of local scour depth around a bridge pier." Journal of Korean Society of Civil Engineers, Vol. 27, No. 1, pp. 29-35 (in Korean).
  11. Maxey, M.R., and Riley, J.J. (1983). "Equation of motion for a small ridge sphere in a nonuniform flow." Physics of Fluids, Vol. 26, No. 4, pp. 883-889. https://doi.org/10.1063/1.864230
  12. McLaughlin, J.B. (1991). "Inertial migration of a small sphere in linear shear flows." Journal of Fluid Mechanics, Vol. 224, pp. 261-274. https://doi.org/10.1017/S0022112091001751
  13. Mei, R. (1992). "An approximate expression for the shear lift force on a spherical particle at finite Reynolds number." International Journal of Multphase Flow, Vol. 18, No. 1, pp. 145-147. https://doi.org/10.1016/0301-9322(92)90012-6
  14. Melville, B. W., and Coleman, S. (2000). Bridge scour. Water Resources Publication, Colo.
  15. Morsi, S.A., and Alexander, A.J. (1972). "An investigation of particle trajectories in two-phase flow systems." Journal of Fluid Mechanics, Vol. 55, No. 2, pp. 193-208. https://doi.org/10.1017/S0022112072001806
  16. Nabi, M. (2012). Computational modelling of small-scale river morphodynamics. Ph.D. dissertation, Delft University of Technology, Netherlands.
  17. Nagata, N., Hosoda, T., Nakato, T., and Muramoto, Y. (2005). "Three-dimensional numerical model for flow and bed deformation around river hydraulic structures." Journal of Hydraulic Engineering. Vol. 131, No. 12, pp. 1074-1087. https://doi.org/10.1061/(ASCE)0733-9429(2005)131:12(1074)
  18. Olsen, N., and Melaaen, C. (1993). "Three dimensional calculation of scour around cylinders." Journal of Hydraulic Engineering, Vol. 119, No. 9, pp. 1048-1054. https://doi.org/10.1061/(ASCE)0733-9429(1993)119:9(1048)
  19. Paik, J., Escauriaza, C., and Sotiropoulos, F. (2010). "Coherent structure dynamics in turbulent flows past in-stream structures: some insights gained via numerical simulation." Journal of Hydraulic Engineering, Vol. 136, No. 12, pp. 981-993. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000089
  20. Roulund, A., Sumer, B. M., Fredsoe, J., and Michelsen, J. (2005). "Numerical and experimental investigation of flow and scour around a circular pile." Journal of Fluid Mechanics, Vol. 534, pp. 351-401. https://doi.org/10.1017/S0022112005004507
  21. Saffman, P.G. (1965). "The lift on a small sphere in a slow shear flow." Journal of Fluid Mechanics, Vol. 22, No. 2, pp. 385-400. https://doi.org/10.1017/S0022112065000824
  22. Schmeeckle, M.W., Nelson, J.M., Pitlick, J., and Bennett, J.P. (2001). "Interparticle collosion of natural sediment grains in water." Water Resources Research, Vol. 37, No. 9, WR000531.
  23. Smagorinsky, J.S. (1963). "General circulation experiments with the primitive equations." MonthlyWeather Review, Vol. 91, No. 3, pp. 99-164.
  24. Sumer, B.M., and Fredsoe, J. (1998). "Wave scour around group of vertical piles." Journal of Waterway, Port, Coastal and Ocean Engineering, Vol. 124, No. 5, pp. 248-256. https://doi.org/10.1061/(ASCE)0733-950X(1998)124:5(248)
  25. Sumer, B. M., and Fredsoe, J. (2002). The mechanics of scour in the marine environment. Water Resources Publications, LLC.
  26. Yang, W., and Choi, S-U. (2002). "Three-dimensional numerical simulation of local scour around the bridge pier using large eddy simulation." Journal of Korean Society of Civil Engineers, Vol. 22, No. 4, pp. 437-446 (in Korean).
  27. Yoon, B., Seo, J., and Roh, Y. (2001). "An experimental study on local scour around group pile foundation." Journal of Korean Society of Civil Engineers, Vol. 34, No. 6, pp. 641-649 (in Korean).
  28. Zhao, M., Cheng, L., and Zang, Z. (2010). "Experimental and numerical investigation of local scour around a submerged vertical circular in steady currents." Coastal Engineering, Vol. 27, pp. 709-721.