پیوندهای مفید
آمار
| تعداد نشریات | 8 |
| تعداد شمارهها | 439 |
| تعداد مقالات | 5,666 |
| تعداد مشاهده مقاله | 7,787,074 |
| تعداد دریافت فایل اصل مقاله | 6,379,988 |
Numerical Modeling of Hydraulic Properties of Sloped Broad Crested Weir | ||
| AUT Journal of Civil Engineering | ||
| مقاله 9، دوره 4، شماره 2، شهریور 2020، صفحه 229-240 اصل مقاله (1.93 M) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/ajce.2019.16184.5574 | ||
| نویسندگان | ||
| Rasoul Daneshfaraz* 1؛ Mehdi Dasineh2؛ Amir Ghaderi3؛ Sina Sadeghfam4 | ||
| 1Associate Professor, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, East Azerbaijan, Iran. | ||
| 2M.Sc. in Civil Engineering-Hydraulic Structures, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, East Azerbaijan, Iran. | ||
| 3Ph.D. Student, Department of Civil Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran. | ||
| 4Assistant Professor, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran. | ||
| چکیده | ||
| In this study, Numerical modeling of hydraulic properties of sloped broad crested weir is numerically investigated. In order to simulate the free surface flow, the Volume of Flow (VOF) method was used. Turbulence models employed in these simulations were RNG k-ε, and standard k-ε models. The results indicate that RNG k-ε model is more accurate in simulating the flow surface profile of the broad crested weir than the standard k-ε turbulence model. By sloping the crest, the flow depth decreases at the downstream of the weir. At the adverse slope, flow velocity toward the downstream of the crest decrease and flow depth increases. In addition, it was observed that in horizontal or positive slope crests, the control section take place over the crest while for the adverse slope, the control section is slightly shifted toward the upstream of the crest. This could be due to the separation of the flow at the apex of the crest. Moreover, the average Froude number increases for a constant slope (adverse or positive) in the downstream of the weir. It was concluded that the total energy at the downstream of the weir is not a function of the crest slope. The energy increases with the height of the weir and flow discharge. The highest amount of the total energy in downstream of the weir occurs for discharges of 3, 4.7 and 6 lit/s with the slopes of 4:1, 4:-1, 8:-1 and are 0.244, 0.317 and 0.452, respectively. | ||
| کلیدواژهها | ||
| Broad crested weir؛ Crest slope؛ Control section؛ Total energy | ||
| مراجع | ||
|
[1] H. A Doeringsfeld, C. L. Baker, Pressure-momentum theory applied to the broad-crested weir, Trans, ASCE, 106 (1941) 934-969.
[2] H. J. Tracy, Discharge characteristics of broad-crested weirs, U.S. Geol. Survey, Circular, 397 (1957) 1-15.
[3] F. M. Henderson, Open channel flow, Macmillan, New York, 1966.
[4] S. S. Rao, M. K. Shukla, Characteristics of flow over weirs of finite crest width, Journal of the Hydraulics Division, 97(11) (1971) 1807-1816.
[5] M. G. Bos, A. J. Clemmens, J. A. Replogle, Flow measuring flumes for open channel systems, Wiley, New York, 1984.
[6] A. S. Ramamurthy, U. S. Tim, M. V. J. Rao, Characteristics of square- edged and round-nosed broad-crested weirs, Journal of Irrigation and Drainage Engineering, 114(1) (1988) 61-73.
[7] W.H. Hager, M. Schwalt, Broad-crested weir, J. Irrig. Drain. Engine, 120(1) (1994) 13-26.
[8] H.M. Fritz, W. H. Hager, Hydraulics of embankment weirs, J. Hydraul. Eng, 124(9) (1998) 963–971.
[9] M.C. Johnson, Discharge coefficient analysis for flat-topped and sharp- crested weirs, Irrigation science, 19(3) (2000) 133-137.
[10] J. Farhoudi, H. Shahalami, Slope effect on discharge efficiency in rectangular broad crested weir with sloped upstream face, Int. J. Civ. Eng., 3(1) (2005) 58-65.
[11] M. Gogus, Z. Defne, V. Ozkandemir, Broad-crested weirs with rectangular compound cross sections, J. Irrig. Drain. Eng, 132(3) (2006) 272–280.
[12] D.M. Hargreaves, H.P. Morvan, N.G. Wright, Validation of the volume of fluid method for free surface calculation: the broad crested weir, Engineering Applications of Computational Fluid Mechanics, 1(2) (2007) 136–146.
[13] J. Farhoudi, N. Shokri, Flow from broad crested rectangular weirs with sloped downstream face, 32nd IAHR Congress, Venice, Italy, 2007.
[14] J. E. Sargison, A. Percy, Hydraulics of broad-crested weirs with varying side slopes, Journal of irrigation and drainage engineering, 135(1) (2009) 115-118.
[15] E. Goodarzi, J. Farhoudi, N. Shokri, Flow characteristics of rectangular broad-crested weirs with sloped upstream face, Journal of Hydrology and Hydromechanics, 60(2) (2012) 87-100.
[16] S. H. Hoseini, Experimental investigation of flow over a triangular broad-crested weir, ISH Journal of Hydraulic Engineering, 20(2) (2014) 230-237.
[17] M. A .Torabi, M. Shafieefar, An experimental investigation on the stability of foundation of composite vertical breakwaters, Journal of Marine Science and Application, 14(2) (2015) 175-182.
[18] N. O. Tănase, D. Broboană, C. Bălan, Free surface flow over the broad- crested weir, In 2015 9th International Symposium on Advanced Topics in Electrical Engineering (ATEE), IEEE, (2015) 548-551.
[19] J. Mohammadzadeh-Habili, M. Heidarpour, A. Haghiabi, Comparison the hydraulic characteristics of finite crest length weir with quarter- circular crested weir, Flow Measurement and Instrumentation, 52 (2016) 77-82.
[20] T. Xu, Y. C. Jin, Numerical Study of the Flow over Broad-Crested Weirs by a Mesh-Free Method, Journal of Irrigation and Drainage Engineering, 143(9) (2017) 04017034.
[21] A. Parsaie, H. M.Azamathulla, A. H. Haghiabi, Prediction of discharge coefficient of cylindrical weir–gate using GMDH-PSO, ISH Journal of Hydraulic Engineering, 24(2) (2018) 116-123.
[22] R. Daneshfaraz, O. Minaei, J. Abraham, S. Dadashi, A. Ghaderi, 3-D Numerical simulation of water flow over a broad-crested weir with openings, ISH Journal of Hydraulic Engineering, (2019) 1-9.
[23] R. Daneshfaraz, B. Kaya, Solution of the propagation of the waves in open channels by the transfer matrix method. Ocean Engineering, 35(11-12) (2008) 1075-1079.
[24] P. Suhas, Numerical Heat Transfer and Fluid Flow”. Hemisphere Publishing Corporation, Taylor and Francis Group, New York, (2012) 11-23.
[25] V. Yakhot, S. A. Orszag, S. Thangam, T. B. Gatski, C. G. Speziale, Development of turbulence models for shear flows by a double expansion technique, Physics of Fluids A: Fluid Dynamics, 4(7) (1992) 1510-1520.
[26] H. Zahabi, M. Torabi, E. Alamatian, M. Bahiraei, M. Goodarzi, Effects of Geometry and Hydraulic Characteristics of Shallow Reservoirs on Sediment Entrapment, Water, 10(12) (2018) 1725.
[27] M. A. Sarker, D. G. Rhodes, Calculation of free-surface profile over a rectangular broad-crested weir, Flow measurement and Instrumentation, 15(4) (2004) 215-219.
[28] R. Daneshfaraz, A. Ghahramanzadeh, A.Ghaderi, A. R. Joudi, J. Abraham, Investigation of the Effect of Edge Shape on Characteristics of Flow under Vertical Gates, Journal‐American Water Works Association, 108(8) (2016) 425-432.
[29] R. Daneshfaraz, A. Ghaderi, Numerical Investigation of Inverse Curvature Ogee Weir, Civil Engineering Journal, 3(11) (2017) 1146- 1156.
[30] R. Daneshfaraz, A.R. Joudi, A. Ghahramanzadeh, A. Ghaderi, Investigation of flow pressure distribution over a stepped spillway. Advances and Applications in Fluid Mechanics, 19(4) (2016) 811.
| ||
|
آمار تعداد مشاهده مقاله: 1,097 تعداد دریافت فایل اصل مقاله: 711 |
||