Fig. 1. Schematic diagram of compound open channels used in this study (Lee 2017).
Fig. 2. Computational setup and boundary conditions for the large eddy simulation (LES) used in this study (Lee 2017).
Fig. 3. Composition of cross sectional grid points used in this study (Lee 2017).
Fig. 4. Normalized streamwise mean velocity in case CR01.
Fig. 5. Normalized streamwise mean velocity in case CR13.
Fig. 6. Normalized streamwise mean velocity in case CR24.
Fig. 7. Secondary currents of the case CR01.
Fig. 8. Secondary currents of the case CR13.
Fig. 9. Secondary currents of the case CR24.
Fig. 10. Bed shear stress distribution in case CR01.
Fig. 11. Bed shear stress distribution in case CR04.
Fig. 12. Bed shear stress distribution in case CR11.
Fig. 13. Bed shear stress distribution in case CR14.
Fig. 14. Bed shear stress distribution in case CR21.
Fig. 15. Bed shear stress distribution in case CR24.
Fig. 16. Variation of max bed shear stresses with b/B in main channel.
Fig. 17. Variation of max bed shear stresses with h/H in main channel.
Fig. 18. Variation of max bed shear stresses with b/B in floodplain.
Fig. 19. Variation of max bed shear stresses with h/H in floodplain.
Table 1. Flow conditions of the simulation cases in this study
References
- Ban, C. and Choi, S.U. 2011. Large eddy simulation of rectangular open-channel flow using OpenFOAM. Journal of the Korean Society of Civil Engineers 34(3): 833-840. https://doi.org/10.12652/Ksce.2014.34.3.0833
- Cater, J.E. and Williams, J.J.R. 2008. Large eddy simulation of a long asymmetric compound. Journal of Hydraulic Research 46(4): 445-453. https://doi.org/10.3826/jhr.2008.3134
- Constantinescu, G., Sukhodolov, A. and McCoy, A. 2009. Mass exchange in a shallow channel flow with a series of groynes: LES study and comparison with laboratory and field experiments. Environmental Fluid Mechanics 9(6): 587. https://doi.org/10.1007/s10652-009-9155-2
- Kara, S., Stoesser, T., and Sturm, T.W. 2012. Turbulence statistics in compound channels with deep and shallow overbank flows. Journal of Hydraulic Research, 50(5), 482-493, DOI: 10.1080/00221686.2012.724194.
- Lee, D. 2017. Analysis of compound open channel flow using Large Eddy Simulation (LES). Ecology and Resilient Infrastructure 4(1): 054-062. https://doi.org/10.17820/eri.2017.4.1.054
- Naot, D., Nezu, I. and Nakagawa, H. 1993. Hydrodynamic behavior of compound rectangular open channels. Journal of Hydraulic Engineering 119(3): 390-408. https://doi.org/10.1061/(ASCE)0733-9429(1993)119:3(390)
- Pezzinga, G. 1994. Velocity distribution in compound channel flows by numerical modeling. Journal of Hydraulic Engineering 120(10): 1176-1198. https://doi.org/10.1061/(ASCE)0733-9429(1994)120:10(1176)
- Prinos, P., Townsend, R. and Tavoularis, S. 1985. Structure of turbulence in compound channel flows. Journal of Hydraulic Engineering 111(9): 1246-1261. https://doi.org/10.1061/(ASCE)0733-9429(1985)111:9(1246)
- Rogallo, R.S. and Moin, P. 1984. Numerical simulation of turbulent flows. Annual Review of Fluid Mechanics 16(1): 99-137. https://doi.org/10.1146/annurev.fl.16.010184.000531
- Shiono, K. and Knight, D.W. 1991. Turbulent open channel flows with variable depth across the channel. Journal of Fluid Mechanics 222: 617-646. https://doi.org/10.1017/S0022112091001246
- Sofialidis, D. and Prinos, P. (1998). Compound open-channel flow modelling with nonlinear low-Reynolds k-e models. J. Hydraulic Eng., 124 (3): 253-262. https://doi.org/10.1061/(ASCE)0733-9429(1998)124:3(253)
- Stoesser, T., Kim, S.J. and Diplas, P. 2010. Turbulent flow through idealized emergent vegetation. Journal of Hydraulic Engineering 136(12): 1003-1017. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000153
- Thomas, T.G. and Williams, J.J.R. 1995. Large eddy simulation of turbulent flow in an asymmetric compound open channel. Journal of Hydraulic Research 33(1): 27-41. https://doi.org/10.1080/00221689509498682
- Tominaga, A. and Nezu, I. 1991. Turbulent structure in compound open-channel flows. Journal of Hydraulic Engineering 117(1): 21-41. https://doi.org/10.1061/(ASCE)0733-9429(1991)117:1(21)
- Van Balen, W., Blanckaert, K. and Uijttewaal, W.S.J. 2010. Analysis of the role of turbulence in curved open-channel flow at different water depths by means of experiments, LES and RANS. Journal of Turbulence 11(12): 1-34. https://doi.org/10.1080/14685241003627760