Computation of 2D Supercritical Free-Surface Flow in Rectangular Weak Channel Bends
Publication: Journal of Irrigation and Drainage Engineering
Volume 150, Issue 5
Abstract
In order to study the supercritical flow in a curved channel of a rectangular cross section, the classical shallow water equations in a cylindrical coordinate system based on the mass and momentum laws that take into account the friction and bottom slope are used. The obtained mathematical model forms nonlinear partial differential equations of first-order. For simplification, a linearization of the partial differential equations (PDEs) set is performed using small perturbation approach valid for weak bends (axial curvature radius extremely larger than the channel width). The governing equations with well-posed initial and boundary conditions were solved for a rectangular bend channel flow by applying the method of characteristics that is capable of transforming the hyperbolic partial differential equations to a system of ordinary differential equations (ODEs). The proposed model is tested and validated by comparing the results with broad available experimental data reported in the literature, and particular attention was paid to the wave maximum and its location. Comparisons indicate a reasonable agreement between the results obtained for the maximum flow depth along the outer channel wall. However, the model prediction is only reliable for a small relative curvature. Despite the model limitations, the results show the reliability and accuracy of the proposed approach for practical design purposes.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the submitted article.
References
Abbott, M. B. 1979. Computational hydraulics: Elements of the theory of free surface flow. London: Pitman.
Amara, L., A. Berreksi, and B. Achour. 2020. “Approximate analytical solution for supercritical flow in rectangular curved channels.” Appl. Math. Modell. 80 (Apr): 191–203. https://doi.org/10.1016/j.apm.2019.10.064.
Anderson, D. A., J. C. Tannehil, and R. H. Pletcher. 1984. Computational fluid mechanics and heat transfer. New York: McGraw-Hill.
Beltrami, G. M., A. D. Guzzo, and R. Repetto. 2007. “A simple method to regularize supercritical flow profiles in bends.” J. Hydraul. Res. 45 (6): 773–786. https://doi.org/10.1080/00221686.2007.9521815.
Bhallamudi, S. M., and M. H. Chaudhry. 1992. “Computation of flow in open-channel transitions.” J. Hydraul. Res. 30 (1): 77–93. https://doi.org/10.1080/00221689209498948.
Chaudhry, M. H. 2008. Open-channel flow. 2nd ed. New York: Springer.
Crispino, G., D. Dorthe, C. Gisonni, and M. Pfister. 2023. “Hydraulic capacity of bend manholes for supercritical flow.” J. Irrig. Drain. Eng. 149 (2): 04022048. https://doi.org/10.1061/JIDEDH.IRENG-10014.
Ghamry, H. K., and P. M. Steffler. 2002. “Two dimensional vertically averaged and moment equations for rapidly varied flows.” J. Hydraul. Res. 40 (5): 579–587. https://doi.org/10.1080/00221680209499902.
Guinot, V. 2008. Wave propagation in fluids: Models and numerical techniques. Somerset, UK: Wiley.
Hager, W. H. 1985. “Equations for plane, moderately curved open channel flows.” J. Hydraul. Eng. 111 (3): 541–546. https://doi.org/10.1061/(ASCE)0733-9429(1985)111:3(541).
Hessaroeyeh, M. G., and A. Tahershamsi. 2009. “Analytical model of supercritical flow in rectangular chute bends.” J. Hydraul. Res. 47 (5): 566–573. https://doi.org/10.3826/jhr.2009.3538.
Ippen, A. T. 1936. “An analytical and experimental study of high velocity flow in curved sections of open channels.” Ph.D. thesis, Dept. of Engineering and Applied Science, California Institute of Technology.
Iwasa, Y., and T. Hosoda. 1989. “Numerical simulation on high velocity flows through curved open channels.” In Proc., Int. Conf. on Interaction of Computational Methods and Measurements in Hydraulics and Hydrology, 87–96. Gent, Belgium: Vlaams Instituut voor Biotechnologie.
Knapp, R. T. 1951. “High-velocity flow in open channels: A symposium design of channel curves for supercritical flow.” Trans. Am. Soc. Civ. Eng. 116 (1): 296–325. https://doi.org/10.1061/TACEAT.0006530.
Knapp, R. T., and A. T. Ippen. 1938. “Curvilinear flow of liquids with free surfaces at velocities above that of wave propagation.” In Proc., 5th Int. Congress for Applied Mechanics, 531–536. New York: Cambridge University Press.
Lai, C. 1986. “Numerical modeling of unsteady open-channel flow.” In Vol. 14 of Advances in hydroscience, 161–333. New York: Academic Press.
Lénau, C. W. 1979. “Supercritical flow in bends of trapezoidal section.” J. Eng. Mech. Div. 105 (1): 43–54. https://doi.org/10.1061/JMCEA3.0002457.
Poggi, B. 1956. “Correnti veloci nei canali in curva.” L’energia Elettrica 33 (5): 465–480.
Rao, S. S. 2011. Mechanical vibrations. 5th ed. Hoboken, NJ: Pearson Education.
Reinauer, R., and W. H. Hager. 1997. “Supercritical bend flow.” J. Hydraul. Eng. 123 (3): 208–218. https://doi.org/10.1061/(ASCE)0733-9429(1997)123:3(208).
Saichev, A. I., and W. A. Woyczynski. 2013. Distributions in the Physical and Engineering Sciences, Volume 2. New York: Springer.
Steffler, P. M., N. Rajaratnam, and A. W. Peterson. 1985. “Water surface at change of channel curvature.” J. Hydraul. Eng. 111 (5): 866–870. https://doi.org/10.1061/(ASCE)0733-9429(1985)111:5(866).
Strang, G. 2006. Linear algebra and its applications. Belmont, CA: Thomson Brooks/Cole.
Valiani, A., and V. Caleffi. 2005. “Brief analysis of shallow water equations suitability to numerically simulate supercritical flow in sharp bends.” J. Hydraul. Eng. 131 (10): 912–916. https://doi.org/10.1061/(ASCE)0733-9429(2005)131:10(912).
Von Kármán, T. 1938. “Eine praktische anwendung der analogie zwischen Überschallströmung in Gasen und überkritischer Strömung in offenen Gerinnen.” ZAMM 18 (1): 49–56. https://doi.org/10.1002/zamm.19380180108.
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© 2024 American Society of Civil Engineers.
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Received: Feb 6, 2023
Accepted: Apr 9, 2024
Published online: Jun 17, 2024
Published in print: Oct 1, 2024
Discussion open until: Nov 17, 2024
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