Hydraulic characteristics of converse curvature section and aerator in high-head and large discharge spillway tunnel

Liu, Zhiping; Zhang, Dong; Zhang, Hongwei; Wu, Yihui

doi:10.1007/s11431-011-4626-3

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…The second-order implicit scheme was adopted in the time domain. The free surface was tracked by Volume of Fluid (VOF) [16]. As for the boundary conditions in the numerical simulation, the upstream boundary was set to the pressure inlet and given different upstream water depths.…”

Section: Fluid Conditionsmentioning

confidence: 99%

Holding Force and Vertical Vibration of Emergency Gate in the Closing Process: Physical and Numerical Modelling

Wang

Liu

2021

Applied Sciences

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A two-dimensional unsteady fluid–structure interaction numerical model was established, based on the physical model test, to investigate the influence of vertical vibration on the holding force of an emergency gate in the closing process. Gate motion was controlled by the user-defined function in Fluent. Attention was paid to the relationship between the vertical vibration, hydrodynamic loads and flow discharge. The experiment results show that holding force has three typical forms in the closing process and it is related to the service gate height. The numerical model can reflect the gate vertical vibration and the gate-closing displacement in the form of steps. Gate vertical vibration in the closing process is a motion-induced vibration caused by gate active falling. Moreover, the transition from full-flow to open-flow behind the emergency gate has a great influence on the gate vertical vibration. With a small gate opening, gate vertical vibration makes the flow discharge fluctuation increase. Furthermore, flow discharge has an influence on the gate body loads, which is mainly concentrated in the upstream plate and gate bottom. Finally, the lift force coefficient at the gate bottom is different from the standard and is mainly controlled by the outflow boundary condition. The simulation result is in good agreement with the experiment and the relative error meets engineering requirements, suggesting that the numerical model can successfully simulate the gate fluid–structure interaction and reproduce the characteristics of physical quantities in the closing process.

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Section: Fluid Conditionsmentioning

confidence: 99%

Holding Force and Vertical Vibration of Emergency Gate in the Closing Process: Physical and Numerical Modelling

Wang

Liu

2021

Applied Sciences

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“…The air above the water flow is dragged away by the high-speed water flow, causing negative pressure in the tunnel. However, the negative pressure may affect the normal operation of the aerators and the gate, which will adversely affect structural safety [2] . In order to reduce the negative pressure in the tunnel and ensure sufficient air supply, air intake wells are usually set up in the tunnel.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of air demand in free surface spillway tunnel

Tian

Jaturapitakkul

2023

3rd International Conference on Applied Mathematics, Modelling, and Intelligent Computing (CAMMIC 2023)

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During the normal operation of the spillway tunnel, the water velocity can reach 50m s-1. High-speed water flow leads to problems such as negative pressure and high-frequency noise above the tunnel, affecting the normal operation of various facilities in the tunnel and the health of the staff. In this study, a 3D numerical simulation of free surface spillway tunnel with a rectangular cross-section is carried out. The Euler multiphase model combined with the realizable k-epsilon dual turbulence equation was used to analyze velocity distribution of air above flow surface. The velocity distribution is maintained on the same curve with sufficient residual height. The calculation equation of air velocity distribution is fitted by the couette flow related theory, and the simulation results can be well predicted.

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“…Generally, observation of a prototype and hydraulic test models can be used to evaluate the hydraulic cavitation characteristics of a spillway [15][16][17]. Prototype observation and experimental tests are more expensive and time consuming, thus they are used only for some medium-head to high-head dam projects [6,[18][19][20]. Compared with physical experiments, numerical simulations are more convenient with the development of the CFD technique [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Numerical Prediction and Risk Analysis of Hydraulic Cavitation Damage in a High‐Speed‐Flow Spillway

Wan

Liu

Raza

2018

Shock and Vibration

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Hydraulic cavitation is usually an undesirable phenomenon since it can damage the concrete surface of a chute spillway. In order to numerically predict the potential cavitation of a high-speed flow in a chute spillway, a compound risk assessment is proposed by combining probabilistic analysis with a computational fluid dynamics (CFD) technique. Based on the local pressure and flow velocity of the nodes, the traditional cavitation number is introduced to characterize the possibility of cavitation. The distribution of cavitation numbers was obtained according to the numerical simulation of the flow field in an open spillway. A hydraulic experiment was conducted to validate the numerical result. As a result, the potential cavitation region could be shown by visualizing the numerical result. Comparing the numerical results with the experimental results, hydraulic model validates the numerical simulation. The proposed numerical approach is economical and saves time; moreover, it can provide greater information about the potential cavitation region. This approach is more convenient for designers in their efforts to optimize the spillway shape and protect the concrete structure from cavitation erosion while maintaining lower costs and achieving higher visualization.

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Hydraulic characteristics of converse curvature section and aerator in high-head and large discharge spillway tunnel

Cited by 6 publications

References 3 publications

Holding Force and Vertical Vibration of Emergency Gate in the Closing Process: Physical and Numerical Modelling

Holding Force and Vertical Vibration of Emergency Gate in the Closing Process: Physical and Numerical Modelling

Numerical investigation of air demand in free surface spillway tunnel

Numerical Prediction and Risk Analysis of Hydraulic Cavitation Damage in a High‐Speed‐Flow Spillway

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