Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
권호 표지
DOI QR코드

DOI QR Code

Flow and Scour Analysis Around Monopole of Fixed Offshore Platform Using Method that Couples Computational Fluid Dynamics and Discrete Element Method

CFD-DEM 연계기법을 활용한 고정식 해양구조물의 모노파일 주위 유동 및 세굴해석

  • Song, Seongjin (Department of Ocean Engineering, Korea Maritime and Ocean University) ;
  • Jeon, Wooyoung (Department of Ocean Engineering, Korea Maritime and Ocean University) ;
  • Park, Sunho (Department of Ocean Engineering, Korea Maritime and Ocean University)
  • 송성진 (한국해양대학교 해양공학과) ;
  • 전우영 (한국해양대학교 해양공학과) ;
  • 박선호 (한국해양대학교 해양공학과)
  • Received : 2019.03.29
  • Accepted : 2019.06.13
  • Published : 2019.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

When an offshore foundation is exposed to waves and currents, local scour could develop around a pile and even lead to structural failure. Therefore, understanding and predicting the scour due to sediment transport around foundations are important in the engineering design. In this study, the flow and scour around a monopole foundation exposed to a current were investigated using a method that coupled the computational fluid dynamics (CFD) and discrete element method (DEM). The open source computation fluid dynamics library OpenFOAM and a sediment transport library were coupled in the OpenFOAM platform. The incipient motion of the particle was validated. The flow fields and sediment transport around the monopole were simulated. The scour depth development was simulated and compared with existing experimental data. For the upstream scour hole, the equilibrium scour depth could be reproduced qualitatively, and it was underestimated by about 23%.

Keywords

References

  1. Ali, S.Z., Dey, S., 2017. Origin of the Scaling Laws of Sediment Transport. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 473(2197). https://doi.org/10.1098/rspa.2016.0785
  2. Anderson, T., Jackson, R., 1967. A Fluid Mechanical Description of Fluidized Beds: Equations of Motion. Industrial & Engineering Chemistry Fundamentals, 6(4), 527-539. https://doi.org/10.1021/i160024a007
  3. Baykal, C., Sumer, B.M., Fuhrman, D.R., Jacobsen, N.G., Fredsoe, J., 2017. Numerical Simulation of Scour and Backfilling Processes around a Circular Pile in Waves. Coastal Engineering, 122, 87-107. https://doi.org/10.1016/j.coastaleng.2017.01.004
  4. Cundall, P.A., Strack, O.D., 1979. A Discrete Numerical Model for Granular Assemblies. Geotechnique, 29(1), 47-65. https://doi.org/10.1680/geot.1979.29.1.47
  5. Dargahi, B., 1989. The Turbulent Flow Field around a Circular Cylinder. Experiments in Fluids, 8(1-2), 1-12. https://doi.org/10.1007/BF00203058
  6. Goniva, C., Kloss, C., Deen, N.G., Kuipers, J.A., Pirker, S., 2012. Influence of Rolling Friction on Single Spout Fluidized Bed Simulation. Particuology, 10(5), 582-591. https://doi.org/10.1016/j.partic.2012.05.002
  7. Hur, D.S., Jeon, H.S., 2011. Development of Numerical Model for Scour Analysis under Wave Loads in Front of an Impermeable Submerged Breakwater. Journal of The Korean Society of Civil Engineers, 31.
  8. Kloss, C., Goniva, C., Hager, A., Amberger, S., Pirker, S., 2012. Models, Algorithms and Validation for Opensource DEM and CFD-DEM. Progress in Computational Fluid Dynamics, an International Journal, 12(2-3), 140-152. https://doi.org/10.1504/PCFD.2012.047457
  9. Koch, D.L., Hill, R.J., 2001. Inertial Effects in Suspension and Porous-media Flows. Annual Review of Fluid Mechanics, 33(1), 619-647. https://doi.org/10.1146/annurev.fluid.33.1.619
  10. Li, J., Tao, J., 2018. CFD-DEM Two-Way Coupled Numerical Simulation of Bridge Local Scour Behavior under Clear-Water Conditions. Transportation Research Board 97th Annual Meeting (No. 18-05939), Washington, DC, USA.
  11. Lim, B.G., Son, M., 2016. Study on Applicability of Fractal Theory to Cohesive Sediment in Small Rivers. Journal of Korea Water Resource Association, 49, 887-901. https://doi.org/10.3741/JKWRA.2016.49.10.887
  12. Pang, A.L.J., Skote, M., Lim, S.Y., Gullman-Strand, J., Morgan, N., 2016. A Numerical Approach for Determining Equilibrium Scour Depth around a Mono-pile Due to Steady Currents. Applied Ocean Research, 57, 114-124. https://doi.org/10.1016/j.apor.2016.02.010
  13. Park, S., Song, S., Whang, H. Joung, T., Shin, Y., 2017. Parametric Study on Scouring around Suction Bucket Foundation. Journal of Ocean Engineering and Technology, 31(4), 281-287. https://doi.org/10.26748/KSOE.2017.08.31.4.281
  14. Roulund, A., Sumer, B.M., Fredsoe, J., Michelsen, J., 2005. Numerical and Experimental Investigation of Flow and Scour around a Circular Pile. Journal of Fluid Mechanics, 534, 351-401. https://doi.org/10.1017/S0022112005004507
  15. Schmeeckle, M.W., 2014. Numerical Simulation of Turbulence and Sediment Transport of Medium Sand. Journal of Geophysical Research: Earth Surface, 119(6), 1240-1262. https://doi.org/10.1002/2013JF002911
  16. Sumer, B.M., Fredsoe, J., 2002. The Mechanics of Scour in the Marine Environment. 17, World Scientific Publishing Company, Singapore.
  17. Sun, R., Xiao, H., 2016. CFD-DEM Simulations of Current-induced Dune Formation and Morphological Evolution. Advances in Water Resources, 92, 228-239. https://doi.org/10.1016/j.advwatres.2016.03.018
  18. Trygsland, E., 2015. Numerical Study of Seabed Boundary Layer Flow around Monopile and Gravity-based Wind Turbine Foundations. Master's Thesis, NTNU, Trondheim, Norway.
  19. Whitehouse, R., 1998. Scour at Marine Structures: A Manual for Practical Applications. Thomas Telford, London.
  20. Xu, S.L., Sun, R., Cai, Y.Q., Sun, H.L., 2018. Study of Sedimentation of Non-cohesive Particles via CFD-DEM Simulations. Granular Matter, 20(1), 4. https://doi.org/10.1007/s10035-017-0769-7
  21. Yang, J., Low, Y.M., Lee, C.H., Chiew, Y.M., 2018. Numerical Simulation of Scour around a Submarine Pipeline Using Computational Fluid Dynamics and Discrete Element Method. Applied Mathematical Modelling, 55, 400-416. https://doi.org/10.1016/j.apm.2017.10.007