Journal of Water Resources and Ocean Science
Volume 5, Issue 6, December 2016, Pages: 114-121
Received: Jan. 1, 2017;
Accepted: Jan. 13, 2017;
Published: Feb. 3, 2017
Views 2962 Downloads 84
Mohamed Gamal Abdalla, Irrigation and Hydraulics Dept., Faculty of Engineering, Mansoura University, Mansoura, Egypt
In the present research, the effect rough corrugated bed channels on the sediment transport and of the flow passes is studied. Hypothetically, four scenarios of bed cases are tested. In the first case, using large eddy simulation, LES, an investigation of smooth bed is performed for ReT equals 395 (number of Reynolds calculated using the mean friction velocities at wall). The other three corrugated sinusoidal bed shape cases are assumed with different amplitudes and constant wavelengths. An eddy viscosity model which is adapted to wall is applied in this research; while the subgrid scale quantity is depend on the hypothesis gradient. A comparison between data of Cherukat et al.  obtained from Direct Numerical Simulation, DNS, and the data measured by Hudson et al.  with the corresponding computed flow is done. Then, wavy sinusoidal bed shape case is considered. From this study, it was found that the flow is affect strongly by the bed corrugations and the sediment transport is more sensitive for the larger heights of bed corrugations. Also, it is proved that the Rouse theory could be applied clearly in outer zone of the corrugated bed. It is explained generally in this paper that the profiles of turbulent Schmidt number are not affected by the height of corrugation.
Mohamed Gamal Abdalla,
Effect of Corrugated Rough Bed Channels on Sediment Transport Processes, Journal of Water Resources and Ocean Science.
Vol. 5, No. 6,
2016, pp. 114-121.
Ashrafian A., Andersson H. and Manhart M. "DNS of turbulent ﬂow in a rod-roughened channel", International Journal of Heat and Fluid Flow, Vol. 25, pp. 373–383, 2004.
Bhaganagar K., Kim J. and Coleman G. "Effects of wall bounded roughness on turbulence", Int. J. of Heat and Fluid Flow, Vol. 72, pp. 463–492, 2004.
Boersma W., Laven J. and Stein H. "Computer simulations of shear thickening of concentrated dispersions", J. of Rheology, Vol. 39, pp. 841–859, 1995.
Cellino M. "Experimental study of suspension ﬂow in open channels", PhD thesis, Ec. Poly. Fed. de Lau., Lausanne, Switz, 1998.
Cherukat P., Na Y., Hanratty T. and Mclughlin J. "Direct numerical simulation of a fully developed turbulent ﬂow over a wavy wall", Theoretical and Computational Fluid Dynamics, Vol. 11, pp. 109 –134, 1998.
Choi H. and Suzuki K. "Large eddy simulation of turbulent ﬂow and heat transfer in a channel with one wavy wall, Int. J. of Heat and Fluid Flow, 2005.
Einstein H. and Barbarossa N. "River channel roughness", J. of Hydr. Eng., Vol. 117, 1952.
Graf W. and Cellino M. "Suspension ﬂows in open channels: experimental study", AHR J. of Hydr. Res., Vol. 40, No. 4, pp. 435–447, 2002.
Grass J. "Structural features of turbulent ﬂow over smooth and rough boundaries", Journal of Fluid Mechanics, Vol. 50, pp. 233–255, 1971.
Heredia M. "Numerical modeling of turbulent ﬂow over rough surfaces", PhD thesis, Dept. of Bur. Bouwk. Lab. Vo. Hydr., Kath. Univ. Leuv. Leuven, Belgium, 2009.
Hudson J., Dykhno L. and Hanratty T. "Turbulence production in ﬂow over a wavy wall", Experiments in Fluids, Vol. 20, pp. 256– 265, 1996.
Jimenez J. "Turbulent ﬂows over rough walls", Annual Review of Fluid Mechanics, Vol. 36, pp. 173–196, 2004.
Kuzan J., Adrian R. and Hanratty T. "Turbulence ﬂows with incipient separation over solid waves", Exper. in Fluids, Vol. 7, pp. 88–98, 1989.
Lee C. "Large eddy simulation of rough-wall turbulent boundary layers", Amer. Inst. of Aero. & Astron., Vol. 40, pp. 2127–2130, 2002.
Lely M. "Hydraulics roughness in sediment laden ﬂow".
Leonardi S., Orlandi P., Smalley R., Djenidl L. and An- Tonia R. "Direct numerical simulations of turbulent ﬂow with transverse square bars on one wall", J. of Flu. Mech., Vol. 491, pp. 229–238, 2003.
Miyake Y., Tsujimoto K. and Nagal N. "Numerical simulation of channel ﬂow with a rib-roughened wall", Journal of Turbulence, Vol. 035, 2002.
Murray P. "Settling velocities and vertical diffusion of particles in turbulent water", J. of Sedi. Petr., Vol. 75, pp. 1647–1654, 1970.
Nakagawa S. and Hanratty T. "Inﬂuence of a wavy boundary on turbulence intermediate roughened and hydraulically smooth surface", Experiments in Fluids Vol. 35, pp. 437–447, 2003.
Nakagawa S., Na Y. and Hanratty T. "Inﬂuence of a wavy boundary on turbulence. i. highly rough surface", Exper. in Fluids, Vol. 35, pp. 422–436, 2003.
Nikuradse J. "Laws of ﬂow in rough pipes", Technical Memorandum, NACA-TM-1292, NASA, 1950.
Orlandi P., Leonardi S., Tuzi R. and Antonia R. "Direct numerical simulation of turbulent channel ﬂow with wall velocity disturbances", Phys. of Flui, Vol. 15, No. (12), 2003.
Orlandi P. and Leonardi S. "Passive scalar in a turbulent channel ﬂow with wall velocity disturbances", Flow & Turbulence and Combustion, Vol. 72, pp. 181–197, 2004.
Orlandi P. and Leonardi S., Djenidi L. and Antonia R. "Structure of turbulent channel ﬂow with square bars on one wall", International Journal of Heat and Fluid Flow, Vol. 25, pp. 384–392, 2004.
Stoesser T., Mathiey F., Frohlich J. and Rodi W. "LES of ﬂow over multiple cubes", Ercoftac Bull. March, 2003.
Tseng Y. and Ferziger J. "Large eddy simulation of turbulent wavy boundary ﬂow - illustration of vortex dynamics", J. of Turb, 2004.
Yoon J. and Kang S. "A numerical model of sediment-laden turbulent ﬂow in an open channel", Canadian J. of Civil Eng., Vol. 32, pp. 233–240, 2005.