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Numerical modeling of cavitation on spillway＇s flip bucket

Frontiers of Structural and Civil Engineering 2016年第4期10卷 438-444页

作者： Abbas PARSAIE Sadegh DEHDAR-BEHBAHANI amir hamzeh haghiabi Department of water Engineering Lorestan University Khorramabad Iran Hydro Structures Shahid Chamran University Ahvaz Iran

Numerical modeling of hydraulic phenomenon by computational fluid dynamic （CFD） approaches is one of the main parts in the high cost hydraulic structure studies. In this paper, using Flow 3D as CFD commercial tool, the cavitation phenomenon was assessed along spillway＇s flip bucket of the Balaroud dam. Performance of numerical modeling was compared to the physical model, which was constructed to this purpose. During numerical modeling, it was found that RNG turbulence model is a suitable performance for modeling the cavitation. Physical modeling shows that minimum cavitation index is about 0.85 and minimum cavitation index based on Flow 3D results is about 0.665, which was related to the flood discharge with return period of 10000 years. The main difference between numerical and physical modeling is related to the head of velocity, which is considered in physical modeling. Results of numerical simulation show that occurrence of cavitation based on cavitation index equal to 0.25 is not possible along the spillway.

关键词： cavitation Index numerical simulation spillway's flip Bucket CFD Balaroud Dam physical modeling

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Predication of discharge coefficient of cylindrical weir- gate using adaptive neuro fuzzy inference systems （ANFIS）

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Frontiers of Structural and Civil Engineering 2017年第1期11卷 111-122页

作者： Abbas PARSAIE amir hamzeh haghiabi Mojtaba SANEIE Hasan TORABI Department of Water Engineering Lorestan University Khorramabad Iran Soil Conservation and Watershed Management Research Institute Tehran Iran

Settlement of sediments behind weirs and accumulation of materials floating on water behind gates decreases the performance of these structures. Weir-gate is a combination of weir and gate structures which solves them Infirmities. Proposing a circular shape for crest of weirs to improve their performance, investigators have proposed cylindrical shape to improve the performance of weir-gate structure and call it cylindrical weir-gate. In this research, discharge coefficient of weir-gate was predicated using adaptive neuro fuzzy inference systems （ANFIS）. To compare the performance of ANFIS with other types of soft computing techniques, multilayer perceptron neural network （MLP） was prepared as well. Results of MLP and ANFIS showed that both models have high ability for modeling and predicting discharge coefficient; however, ANFIS is a bit more accurate. The sensitivity analysis of MLP and ANFIS showed that Froude number of flow at upstream of weir and ratio of gate opening height to the diameter of weir are the most effective parameters on discharge coefficient.

关键词： weir-gate soft computing crest geometry circular crest weir cylindrical shape

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An experimental study on plunging depth of density currents

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Frontiers of Earth Science 2017年第4期11卷 388-395页

作者： Hassan GOLEIJ amir hamzeh haghiabi Abbas PARSAIE Department of Water Engineering Lorestan University Khorram Abad Iran

Mass density of the current flows is the one of the important problem in the hydraulics of the dam reservoir. Plunge point occurs when the mass density current penetrates in the stagnant fluid. Recognition the place of this point is very important because of clearing the boundary of the density current flow and ambient fluid. In this study the influences of bed slope and hydraulic parameters on plunging depth were experimentally investigated. The results show that the slope has a minor effect on the plunging depth. The height of plunging depth is increased by increasing the density of the current flow. Also increasing the densimetric Froude number caused of decreasing the plunging depth. Finally an equation was proposed to estimate the plunging depth using as function of flow characteristics.

关键词： dense current plunge point Densimetric Froude Number dam reservoirs

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