Numerical study, investigation effect of distance and angle of spur dike on average velocity distribution and maximum velocity position at mild 90 degree bend
Subject Areas : Irrigation and Drainage
یاسر
اهلی
1
(گروه مهندسی رودخانه، دانشگاه علوم و فنون دریایی خرمشهر، خرمشهر، ایران.)
مرتضی
بختیاری
2
(گروه مهندسی دریا دانشگاه علوم و فنون دریایی خرمشهر، خرمشهر، ایران.)
مسیح
مر
3
(گروه مهندسی دریا دانشگاه علوم و فنون دریایی خرمشهر، خرمشهر، ایران.)
Keywords: Spur dike, average velocity distribution, maximum velocity, ANSYS CFX software, mild 90 degree bend, آبشکن, توزیع سرعت متوسط, حداکثر سرعت, نرم افزار ANSYS CFX و قوس 90 درجه ملایم,
Abstract :
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.
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