الگوی جریان در کانال قوسی با آبشکن سرسپری جاذب و دافع مستغرق با مدل SSIIM

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد، گروه مهندسی عمران، سازه های هیدرولیکی، دانشکده فنی و مهندسی، دانشگاه خلیج فارس ،بوشهر، ایران

2 دانشیار گروه مهندسی عمران، سازه های هیدرولیکی، دانشکده فنی و مهندسی، دانشگاه خلیج فارس، بوشهر، ایران

چکیده

در این مطالعه الگوی جریان  با تغییر درصد استغراق آبشکن (0، 15 و 25 درصد عمق آب در ورودی کانال) در حالت آبشکن­های جاذب و دافع ( با انحراف 30 درجه نسبت به جریان) بررسی شد. جهت مدل­سازی از نرم‌افزار SSIIM بهره گرفته شد. در این مطالعه خطوط جریان، قدرت جریان ثانویه، ناحیه و اتصال مجدد جریان مورد بررسی قرار گرفت. نتایج عددی و آزمایشگاهی با هم مقایسه شده و این مقایسه نشان داد که نتایج عددی از تطابق نسبی خوبی با نتایج آزمایشگاهی برخوردار است. نتایج نشان داد با افزایش درصد استغراق مقدار جهش­دار مقادیر قدرت جریان ثانویه در حالت دافع کاهش و در حالت جاذب  افزایش می‌یابد. علاوه بر این، در حالت دافع نسبت به حالت جاذب خطوط جریان در بالادست آبشکن بیش­تر منحرف می‌شوند.

کلیدواژه‌ها


عنوان مقاله [English]

Flow Pattern in a Bend Channel with Attractive and Repelling T-Shaped Spur Dike Using SSIIM Model

نویسندگان [English]

  • Parisa Radan 1
  • Mohammad Vaghefi 2
1 M.Sc. of Hydraulic Structures, Department of Civil Engineering, Persian Gulf University., Bushehr., Iran
2 Associate Professor of Hydraulic Structures, Department of Civil Engineering, Persian Gulf University., Bushehr., Iran
چکیده [English]

This paper studied flow pattern in attractive and repelling modes of a spur dike (30 degree angle to the flow) by changing the submergence percentage of the spur (0, 15 and 25% of depth at the channel entrance). The simulation was made by SSIIM modeling. In this study, streamlines, secondary flow strength and flow separation and reattachment zones were addressed. The numerical results were compared with experimental data and the comparison showed that the numerical results were in a relatively good agreement with the experimental data. The results indicated that by increasing the submergence percentage, the amount of jumps in secondary flow strength decreased in repelling mode and increased in attractive mode. Moreover, the streamlines at the upstream of the repelling spur dike were more deflected than in the case of the attractive spur dike.

کلیدواژه‌ها [English]

  • Flow Pattern
  • T-Shaped Spur Dike
  • Attractive and Repelling
  • Submergence Percent
  • SSIIM

Abhari,M.N., Ghodsian,M., Vaghefi,M., Panahpur,N. 2010. Experimental and numerical simulation of flow in a 90 bend. Flow Measurement and Instrumentation. 21.3: 292-298.

Basser,H., Karami,H., Shamshirband,S., Akib,S., Amirmojahedi,M., Ahmad,R., Javidnia,H. 2015. Hybrid ANFIS–PSO approach for predicting optimum parameters of a protective spur dike. Applied Soft Computing. 30: 642-649.‏

Blanckaert,K., Graf,W.H. 2001. Mean Flow and Turbulence in Open-Channel Bend. Journal of Hydraulic Engineering, 127.10: 126-138.

Forghani,M.J., Fazli,M., Ghodsian,M. 2007. Experimental study on flow field and scouring around a spur dike in ninety degree bend. 32nd Congress of IAHR, Venice, Italy.

Fazli,M., Ghodsian,M., Neyshabouri,S.A.A. 2008. Scour and flow field around a spur dike in a 90 bend. International Journal of Sediment Research. 23.1: 56-68.

Graf,W.H., Istiarto,I. 2002. Flow pattern in the scour hole around cylinder. Journal of Hydraulic Research. 40.1: 13–20.

Ibrahim,M.M. 2014. Local bed morphological changes due to oriented groins in straight channels. A in Shams Engineering Journal. 5.2: 333-341.

Olsen,N,R,B,A. 2011. Three dimensional numerical model for simulation of sediment movement in water intakes with multiblock option. Department of hydraulic and Environmental Engineering, the Norwegian University of science and Technology.

Shukry,A. 1950. Flow around Bends in an open flume. Transactions of the American Society of Civil Engineers. ASCE 115.1: 751-779.

Tang,X.L., Chen,Z.C., Yang,F. 2006. Dynamic Large Eddy Simulation of Secondary Flow near a Groyne. International Journal of Nonlinear Sciences and Numerical simulation. 7.3: 257- 262.

Vaghefi,M., Ahmadi,A., Faraji,B. 2015. The Effect of Support Structure on Flow Patterns Around T-Shape Spur Dike in 90° Bend Channel. Arabian Journal for Science and Engineering. 1-9.

Vaghefi,M., Ghodsian,M., Adib,A. 2012. Experimental Study on the Effect of Froude Number on Temporal Variation of Scour around a T Shaped Spur Dike in a 90 Degree Bend. In Applied Mechanics and Materials. 147: 75-79.

Vaghefi,M., Ghodsian,M., Neyshabouri,S.A.A. 2012. Experimental study on scour around a T-shaped spur dike in a channel bend. Journal of Hydraulic Engineering. 138.5: 471-474.

Zhang,H., Nakagawa,H., Kawaike,K., Baba,Y. 2009. Experiment and simulation of turbulent flow in local scour around a spur dyke. International Journal of Sediment Research. 24:33-45.