Numerical study on characteristics of dam-break wave

Yang, Shufeng; Yang, Wanli; Qin, Shunquan; Li, Qiao; Yang, Bing

doi:10.1016/j.oceaneng.2018.04.011

Cited by 39 publications

(7 citation statements)

References 30 publications

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“…With the development of computer science, numerical simulations based on Computational Fluid Dynamics (CFD) codes (e.g., Flow-3D(Three-Dimensional), Fluent) have been wildly used. The simulation results have been proved to be consistent with experimental results [21][22][23][24][25][26][27][28][29][30]. For tandem piers, Palau-Salvador et al [31] conducted numerical simulations around two submerged tandem piers and presented flow streamlines at different planes.…”

supporting

confidence: 67%

Numerical Simulation of Velocity Field around Two Columns of Tandem Piers of the Longitudinal Bridge

Zheng

Zhang

2020

Fluids

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This research explores the effects of different spans of two columns of tandem piers on the characteristics of x-velocity near the river bed based on computational fluid dynamics (CFD) simulations. With a span shorter than 27.5D (D is the diameter of piers), the shape and the lateral range of the x-velocity increases with the increase of distance downwards the x-direction. For the area between the tandem piers and the wall, the VRi/VR1 (the ratio of the x-velocity at the i-th row to the x-velocity of the first row in each model) near the wall increases up to 1.26. For the area between the two columns of tandem piers, the profile of VRi/VR1 changes from a “∩-shape” to an “M-shape” in each model. RAVC (average velocity change ratio) of different spans increases gradually and tends to be stable with the increases of the span. The largest RAVC is about −17.66% with a span of 0.52 m. The RMV (the ratio of the maximum x-velocity among piers in each row in different models to the maximum x-velocity of the two piers arranged side by side) of piers in the first row of different models is around 0.95. The RMV becomes 0.82 at the second pier in each model when the span is shorter than 27.5D, and increases to 0.91 if the span is longer than 27.5D. If the span is longer than 27.5D, the RMV of different piers are close to each other from the 2nd pier to the last one.

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supporting

confidence: 67%

Numerical Simulation of Velocity Field around Two Columns of Tandem Piers of the Longitudinal Bridge

Zheng

Zhang

2020

Fluids

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“…At present, most of the research results on dam-break flood simulation focus on the downstream inundation extent, but less on the hydraulic characteristics of the dam-break flood. In addition, few studies that have examined dam-break flood characteristics have focused only on non-karst areas rather than karst areas (Yang et al, 2018). As one of the most vulnerable landform types in the world, karst landscapes are highly sensitive to environmental changes.…”

Section: Discussionmentioning

confidence: 99%

Simulation of one-dimensional dam-break flood routing based on HEC-RAS

Shen

Lei

et al. 2023

Front. Earth Sci.

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Dam-break is a serious disaster resulting in severe damage to downstream communities. Therefore, analyzing the affected range and the evolution process of dam-break floods in advance is valuable. However, the difficulties and challenges lie in the complexity of the breaking process of earth-rock dams, the uncertainty in the evolution of dam-break floods, and the geographical variability. Given this, the objective of this study is to analyze the characteristics of the dam-break flood evolution. The study chooses Chengbi River Reservoir as the research object, HEC-RAS as the simulation software, unsteady flow differential equations and one-dimensional Saint-Venant equations as the control equations, and it uses four-point implicit finite difference method for discrete solution. In this paper, the dam-break flood evolution is simulated under three boundary conditions (full breach, 1/2 breach, 1/3 breach), and the main results are as follows. From the dam site section to the Tianzhou hy-drological station section, the peak discharge decay rates of the three schemes are 78%, 77%, and 67%, respectively. The water level decay rates of the three schemes are 47%, 36%, and 30%, respectively. A 1 m increase in the bursting water level elevation increases the peak flow by ap-proximately 7%, and the highest water level in front of the dam by 1 m, and delays the peak time by 1.5 h on average. In addition, the preliminary inundation extent for the Baise City is obtained. The analysis results can provide a fundamental basis for flood control as well as a reference for flood disaster management.

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“…are the reasons for preference. This model has been improved by the addition of one "ε" extra term for evaluating fast stressed flows and flows across surfaces with a wide range of geometric changes, and it is particularly useful in transient flow simulations [25]. In addition, relying on the comparison made between turbulence models over spillways using Flow-3D conducted by Zhan et al (2010), the Re-Normalization Group turbulence model has had more accurate results than other turbulence models, and it has therefore been used in the present study [26,27].…”

Section: Methodsmentioning

confidence: 99%

Numerical Modeling of Failure Mechanisms in Articulated Concrete Block Mattress as a Sustainable Coastal Protection Structure

et al. 2021

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Shoreline protection remains a global priority. Typically, coastal areas are protected by armoring them with hard, non-native, and non-sustainable materials such as limestone. To increase the execution speed and environmental friendliness and reduce the weight of individual concrete blocks and reinforcements, concrete blocks can be designed and implemented as Articulated Concrete Block Mattress (ACB Mat). These structures act as an integral part and can be used as a revetment on the breakwater body or shoreline protection. Physical models are one of the key tools for estimating and investigating the phenomena in coastal structures. However, it does have limitations and obstacles; consequently, in this study, numerical modeling of waves on these structures has been utilized to simulate wave propagation on the breakwater, via Flow-3D software with VOF. Among the factors affecting the instability of ACB Mat are breaking waves as well as the shaking of the revetment and the displacement of the armor due to the uplift force resulting from the failure. The most important purpose of the present study is to investigate the ability of numerical Flow-3D model to simulate hydrodynamic parameters in coastal revetment. The run-up values of the waves on the concrete block armoring will multiply with increasing break parameter (0.5<ξm−1,0<3.3) due to the existence of plunging waves until it (Ru2%Hm0=1.6) reaches maximum. Hence, by increasing the breaker parameter and changing breaking waves (ξm−1,0>3.3) type to collapsing waves/surging waves, the trend of relative wave run-up changes on concrete block revetment increases gradually. By increasing the breaker index (surf similarity parameter) in the case of plunging waves (0.5<ξm−1,0<3.3), the low values on the relative wave run-down are greatly reduced. Additionally, in the transition region, the change of breaking waves from plunging waves to collapsing/surging (3.3<ξm−1,0<5.0), the relative run-down process occurs with less intensity.

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Numerical study on characteristics of dam-break wave

Cited by 39 publications

References 30 publications

Numerical Simulation of Velocity Field around Two Columns of Tandem Piers of the Longitudinal Bridge

Numerical Simulation of Velocity Field around Two Columns of Tandem Piers of the Longitudinal Bridge

Simulation of one-dimensional dam-break flood routing based on HEC-RAS

Numerical Modeling of Failure Mechanisms in Articulated Concrete Block Mattress as a Sustainable Coastal Protection Structure

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