Effects of side walls and Froude number on flow field over ogee spillway in axial arc condition

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Oftad Seyed Eshagh; Ershadi Cyrus; SANEIE MOJTABA

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:3 Page(s): 1-11

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Title

Effects of side walls and Froude number on flow field over ogee spillway in axial arc condition

Author(s)

Oftad Seyed Eshagh | Ershadi Cyrus | SANEIE MOJTABA | Issue Writer Certificate

Keywords

Ogee spillwayQ1

Axis archQ1

Numerical simulationQ2

FLOW-3DQ2

Abstract

Generally, spillways are provided for the storage to release excess flood water, which cannot be contained in the allotted storage space. Also, spillway weirs are used to bypass the flow released into the system like irrigation canals, power canals, feeder canals, link canals, etc. In general, the excess flow is drawn from the top of the pool created by the dam and conveyed through a nonnatural waterway, that is, a spillway, back into the same river or some other drainage channel. Due to the topography of the study area, sometimes we have to build the dam with Axis arch; therefore if you use a Ogee spillway in such cases, the conditions flow will change and because of this, in the dam upstream with central arc structural and hydraulic conditions are more suitable. In this study, the flow field over thw Ogee spillways in axial arc condition was simulated using FLOW-3D software. In the FLOW-3D model, the Navier-Stokes and continuity equations were discretized using the finite difference method. Also, the computational domain was divided into a mesh of rectangular cells. All variables (except for velocity values) were placed at the center of the computational cells (staggered grid arrangement). To solve the governing equations, control volumes were defined around each dependent variable. The surface fluxes, body forces and surface stresses were computed in terms of surrounding variables. Most terms in the governing equations were explicitly evaluated. To solve the flow field of a non-compressible fluid, the continuity and the Navier-Stocks equations were solved. On the other hand, to validate the numerical results, the experimental measurements that were performed in Soil Conservation and Watershed Management Research Institute at reservoir with dimensions 1. 4 m length, 0. 30 m width and 0. 18 m height. The experimental model was made of plexiglas plates which was a model of prototype at the scale of 1: 75. Moreover, to measure the flow discharge, a sharp triangular weir with apex angle of 90˚ in the output of channel was used. For numerical model, the flow field turbulence was modeled using the k   standard and the RNG k   turbulence model. According to numerical model results, the k   RNG turbulence model had more accuracy than the k   standard turbulence model. Also, variations of flow free surface reconstructed using volume of fluid (VOF) scheme. Then, the effects of the side symmetrical walls of Ogee spillway were examined for models 60o, 90o and 120o in discharges 34, 34 and 22. 6 lit/s, respectively. The applied boundary conditions were chosen according to the physical model. Therefore, the depth and discharge specific values were chosen for inlet boundary condition. At the outlet boundary condition, the outlet boundary condition was used. All the solid walls of the model were defined as the “ Wall” boundary condition. Also, a symmetry plane was defined at the top layer of the computation field. According to numerical results, the acceptable agreement was obtained between numerical results and experimental measurements. For example, the relative error percent of longitudinal profiles of flow free surface were computaed 12. 83, 13. 60 and 3. 48 percentage for cases 120o, 90o and 60o, respectively. Also with increasing angle of axial arc, the height of rooster tail increased significantly. In addition, by increasing Froude number, the height of rooster tail reduced.

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APA: Copy

Oftad, Seyed Eshagh, Ershadi, Cyrus, & SANEIE, MOJTABA. (2018). Effects of side walls and Froude number on flow field over ogee spillway in axial arc condition. MODARES CIVIL ENGINEERING JOURNAL, 18(3 ), 1-11. SID. https://sid.ir/paper/256901/en

Vancouver: Copy

Oftad Seyed Eshagh, Ershadi Cyrus, SANEIE MOJTABA. Effects of side walls and Froude number on flow field over ogee spillway in axial arc condition. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;18(3 ):1-11. Available from: https://sid.ir/paper/256901/en

IEEE: Copy

Seyed Eshagh Oftad, Cyrus Ershadi, and MOJTABA SANEIE, “Effects of side walls and Froude number on flow field over ogee spillway in axial arc condition,” MODARES CIVIL ENGINEERING JOURNAL, vol. 18, no. 3 , pp. 1–11, 2018, [Online]. Available: https://sid.ir/paper/256901/en

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