An Experimental and Numerical Comparison of Flow Hydraulic Parameters in Circular Crested Weir Using Flow3D

Farhad Ghazizadeh, M. Azhdary Moghaddam

Abstract


Circular crested weirs consist of a circular crested of upstream and downstream walls. These weirs are widely used in hydraulic engineering as water discharge structures and can be used to control water level in channels and tanks. In the present study, using Flow3D software, hydraulic properties were investigated to find weir geometry optimization through CFD method. Also, this study attempted to investigate flow on some sections of circular crested weirs in 3 groups and 11 models. Upstream and downstream slope changes as well as the height of the weir were also studied. To validate the model, laboratory models were used. In the research, flow depth parameters on crest, pressure distribution, velocity distribution, energy loss on circular crested weirs, as well as the height and changes of upstream and downstream slope were evaluated. Flow depth on the body of circular crest in this state is about 0.71 (H1). Upstream slope changes on flow depth on the weir’s crest revealed that increasing upstream slope causes to the increase of flow relative depth (H1/R) on the crest about 62%. Downstream changes in H1/R values less than 0.7 have no significant effect on discharge coefficient; however, increasing H1/R values seems to cause more change in slope.


Keywords


Circular Crested Weirs, Flow3D, CFD, Upstream Slope of Weir, Downstream Slope of Weir.

References


Ramamurthy, Amruthur S., and Ngoc-Diep Vo. "Characteristics of circular-crested weir." Journal of hydraulic engineering 119, no. 9 (1993): 1055-1062.

Chaudhry, M. Hanif. Open-channel flow. Springer Science & Business Media, 2007.

Bagheri, Sara, and Manouchehr Heidarpour. "Overflow characteristics of circular-crested weirs." Journal of Hydraulic Research 48, no. 4 (2010): 515-520.

Bazin, Mikhail. Recent experiments on the flow of water over weirs. Engineers Club of Philadelphia, 1890.

Creager, William Pitcher. Engineering for masonry dams. J. Wiley & sons, Incorporated, 1917.

Sarginson, E. J. "The influence of surface tension on weir flow." Journal of Hydraulic Research 10, no. 4 (1972): 431-446.

Bos, Marinus Gijsberthus. "Discharge measurement structures." NASA STI/Recon Technical Report N 78 (1976): 31395.

Ramamurthy, Amruthur S., and Ngoc-Diep Vo. "Characteristics of circular-crested weir." Journal of hydraulic engineering 119, no. 9 (1993): 1055-1062.

Chanson, Hubert, and J. Sergio Montes. "Overflow characteristics of circular weirs: Effects of inflow conditions." Journal of irrigation and drainage engineering 124, no. 3 (1998): 152-162.

Chunrong, Liu, Huhe Aode, and Ma Wenju. "Numerical and experimental investigation of flow over a semicircular weir." Acta Mechanica Sinica 18, no. 6 (2002): 594-602.

Dargahi, Bijan. "Experimental study and 3D numerical simulations for a free-overflow spillway." Journal of Hydraulic Engineering 132, no. 9 (2006): 899-907.

Heydarpour, M., M. R. Chamani, and E. Khorami. "Characteristics of circular-crested and cylindrical weirs." (2006): 21-30.

Bina, M., and Beygipour, Gh.H. , Hydraulic of Submerged Flow in circular-crested Weirs. Proceeding of the 5th Iranian Hydraulic Conference, Shahid Bahonar University. Kerman, Iran, P 49-57, 2005. (In Persian)

Heidarpour M, Habili JM, Haghiabi AH. 2008. Application of potential flow to circular-crested weir. Journal of Hydraulic Research IAHR 46(5): 699-702.

Release, FLOW3D. "3.2: User Manual." AEA Industrial Technology, Harwell Laboratory, Oxfordshire, United Kingdom

(1992).

SabaghYazdi S R, Shamlou H, Rostami F. Educational application of FLOW3D Software to investigate turbulence simulation of 3-d flow in hydraulic jump pool with concrete barriers, technology and education magazine, 2008; 2(4):PP 110-12.

Dressler, Robert F. "New nonlinear shallow-flow equations with curvature." Journal of Hydraulic Research 16, no. 3 (1978): 205-222.


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DOI: 10.28991/cej-2016-00000010

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Copyright (c) 2016 Farhad Ghazizadeh, M. Azhdary Moghaddam

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