Numerical study, investigation effect of distance and angle of spur dike on average velocity distribution and maximum velocity position at mild 90 degree bend

Journal of Water Science & Engineering

مقاله 3، دوره 6، شماره 14، شهریور 2016، صفحه 39-54   

نوع مقاله: Original Article

نویسندگان

Yaser Ahli؛ Morteza Bakhtiari^* ؛ Masih Moore

چکیده

Use the Spur dike as one of the easiest ways to protect the costal of the river has always been of interest to River engineers.The aim of this study was numerical investigate, the effect of distance and angle of the spur dikes parameters  on the pattern of distribution of average velocity  and the location of maximum velocity position at a mild 90 degree bend. For this purpose used ANSYS CFX software for numerical simulation of flow pattern and for calibration of mentioned model used result of Experimental data 3D- velocity data at Bakhtiari et al (2013) research.   Variables of this study were 2 length of spur dike equivalent 15 and 25 percent  of width of canal, 3 distance equivalent 3,5 and 7 times to spur dike length, 2 angle include of vertical and absorbed spur dike at 3cm to bed which investigated at a flume with R/B=4, width 0.7m and water depth 0.12m.  The result of model verification shows good correspondence between the results of numerical models and laboratory. The result show that with increasing the distance between spur dike, the velocities increased too and also caused the increasing the velocity about 75 cm/s on the head of spur dikes. Also the result show that by positioning the absorbent spur dikes the maximum of velocity divert to external bend Therefore, the most destructive is the case for the breakwater.

کلیدواژه‌ها

Spur dike؛ average velocity distribution؛ maximum velocity؛ ANSYS CFX software؛ mild 90 degree bend

مراجع

Bakhtiari.M, Kashefipour S. M. and  M. Ghomeshi (2012). investigation on effect of geometric parameters of spur dike and depth-placed riprap for protection of spur dike in 90° bend, Ph.D. thesis, Shahid Chamran university of Ahwaz, Iran.

Shaker. E, Kashefipour. S.M. (2014). Experimental investigation The Effect of Length,Angle location of Rectangular Spur Dike on velocity distribution and shear stress at 90 degree  bend. Journal of scientific agriculture. 38, 3, pp: 1-12

Ghodsian, M. (2010). Investigation Scouring, sedimentation and flow pattern around the abutment at a 90 degree bend, Final report research plan, Water resource management of Iran.

Zahiri. J., Kashefipour. S. M., Shafaiebajestan, M and Ghomieshi, M. (2011). The Effect of riprap Geometric parameters at spur dike protection at 90 degree bend, Journal of science and irrigation Engineering. 35, 4, pp:49-58

Vaghefi, M. Ghodsiyan, M. Soleimani, B. and Akbari, M. (2014). Numerical investigation bend curvature radius on flow pattern around T-shape spurdike at 90 degree bend with rigid bed. Journal of water management, 7, 53.

Duan J, Li, H, Xudong, X and Wang, W. (2009). Mean flow and turbulence around experimental spur dike. advances in water resources , 32, pp: 1717-1725.

Ghodsian, M. and Vaghefi, M. (2009). Experimental study on scour and flow field in a scour hole around a t-shape spur dike in a 90° bend. International Journal of Sediment Research 24: 145-158.

Giri, S., Shimizu, Y. and Surajata, B. (2004). Laboratory measurement and numerical simulation of flow and turbulence in a meandering-like flume with spurs. Flow Measurement and Instrumentation, 15, pp: 301-309.

Huang, S. L., Jia, Y. F., Chan, H. C., and Wang, S. S. Y. (2009). Three dimensional numerical modeling of secondary flows

in a wide curved channel. Journal of Hydrodynamics, 21, 6, pp: 758–766.

Naji Abhari, M. Ghodsian, M. Vaghefi, M. and Panahpur, N. (2010). Experimental and numerical simulation of flow in a 90 degrees bend. Flow Measurement and Instrumentation 21, pp: 292-298.

Ramamurthy, A., Han, S., and Biron, P. (2013). Three-dimensional simulation parameters for 90° open channel bend flows. Journal of Computing in Civil Engineering, 27, 3, pp:  282–291.

Zhang, M. L., & Shen, Y. M. (2008). Three dimensional simulation of meandering river based on 3-D k − ε (RNG)

turbulence model. Journal of Hydrodynamics, 20(4), 448–455.

Yazdi, J. Sarkardeh, H. Azamathulla H.M. and Ghani, A.A. (2009). 3D simulation of ow around a single spur dike with free-surface. International Journal of River Basin Management, 8, pp: 55-62.

Yazdi, J., Sarkardeh, H. and Azamathulla, H. (2016). 3D simulation of flow around a single spur dike with free-surface flow” International Journal of River Basin Management, International Journal of River Basin Management, 8, 1, pp: 55–62.