Bottom outlet dam flow: physical and numerical modelling

Daneshmand, Farhang; Adamowski, Jan; Liaghat, T.

doi:10.1680/wama.12.00048

Cited by 10 publications

(4 citation statements)

References 23 publications

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“…Numerical models are applied in most of the studies carried out, mainly due to the complexity of the studied problem. 12,13 Obviously, in this framework, the finite element method (FEM) represents one of the main applied methods, [14][15][16] allowing the study of hydraulic forces and flow parameters. Studies on the strength of dams to different loads and risk management are presented.…”

Section: Introductionmentioning

confidence: 99%

Vibration analysis of metallic structure of an innovative dam gate

Itu,

Vlase,

Marin

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part L:

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An analysis of the vibrations that may occur at the gate of a dam is proposed. Thus, the determination of an optimal constructive solution is sought from the point of view of vibration behavior. The dam gate is part of a constructive solution of an oscillating center pivot dam, which closes the gates if the downstream water level rises above a certain limit. This constructive solution is new. The gates are controlled by the water level. Such a system is easy to implement practically and the construction and maintenance costs are lower than in the case of classic dams. The problem that arises is that of the behavior of such a structure to vibrations. The eigenvalues of the gate structure are determined for a constructive solution proposed by the designers and the behavior of the forced vibrations that can stress the gate is studied. The analysis is performed for the case where the dam gates are closed. The work continues previous research on the structure's resistance to static loads and justifies the use of this solution in design. The method used to carry out the study is the finite element method. The advantages of the studied structure consist of lower costs for the proposed relatively simple constructive solution.

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Section: Introductionmentioning

confidence: 99%

Vibration analysis of metallic structure of an innovative dam gate

Itu,

Vlase,

Marin

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part L:

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show abstract

“…Numerical models for the calculation methods established in the field are studied in [ 16 , 17 ]. The numerical methods used are decisively based on the Finite Element Method (FEM) [ 18 , 19 , 20 ] to study the hydraulic forces, the flow parameters in the pipe, and the natural frequencies of the radial gate.…”

Section: Introductionmentioning

confidence: 99%

Stress–Strain Field in an Innovative Metallic Dam Gate Used to Control the Water Flow

Itu

Vlase

2022

Materials

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The paper aims to determine the stress and strain field in metallic dam gates to identify an optimal constructive solution for their design, from the point of view of strength in service. The study is of a dam with a central, oscillating pivot, which has the role of closing the gates when the downstream water level becomes too high and can thus flood the upstream portion of the river. It starts from a constructive solution initially proposed by the designers, which is then modified in several steps, until a better solution is reached in terms of strength to mechanical stress. This solution is obtained after analyzing several structural scenarios. The final results ensure an excellent behavior of the mechanical stresses, and represent a constructive solution that is easy to achieve and is economically convenient.

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“…Besides physical investigations, a numerical study was carried out to evaluate air demand in bottom outlets and simulate air distribution in gated tunnels [10]. Another numerical study on the dam bottom outlet was performed to demonstrate that there is no cavitation zone in the Shahryar dam in Iran [11]. To find the highest air demand, researchers investigated the impact of gate opening on air velocity in Darian's dam's bottom outlet.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Artificial Intelligence Methods for Predicting Air Demand in Dam Bottom Outlet

Narimani¹,

Moghimi²,

Mosavi³

2021

Preprint

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In large infrastructures such as dams, which have a relatively high economic value, ensuring the proper operation of the associated hydraulic facilities in different operating conditions is of utmost importance. To ensure the correct and successful operation of the dam's hydraulic equipment and prevent possible damages, including gates and downstream tunnel, to build laboratory models and perform some tests are essential (the advancement of the smart sensors based on artificial intelligence is essential). One of the causes of damage to dam bottom outlets is cavitation in downstream and between the gates, which can impact on dam facilities, and air aeration can be a solution to improve it. In the present study, six dams in different provinces in Iran has been chosen to evaluate the air entrainment in the downstream tunnel experimentally. Three artificial neural networks (ANN) based machine learning (ML) algorithms are used to model and predict the air aeration in the bottom outlet. The proposed models are trained with genetic algorithms (GA), particle swarm optimization (PSO), i.e., ANN-GA, ANN-PSO, and ANFIS-PSO. Two hydrodynamic variables, namely volume rate and opening percentage of the gate, are used as inputs into all bottom outlet models. The results showed that the most optimal model is ANFIS-PSO to predict the dependent value compared with ANN-GA and ANN-PSO. The importance of the volume rate and opening percentage of the dams' gate parameters is more effective for suitable air aeration.

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Bottom outlet dam flow: physical and numerical modelling

Cited by 10 publications

References 23 publications

Vibration analysis of metallic structure of an innovative dam gate

Vibration analysis of metallic structure of an innovative dam gate

Stress–Strain Field in an Innovative Metallic Dam Gate Used to Control the Water Flow

Hybrid Artificial Intelligence Methods for Predicting Air Demand in Dam Bottom Outlet

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