Numerical simulation of 2D dam break on mobile bed

This paper presents the application of an adaptive stencil diffuse interface method to the simulation of dam break problem. The adaptive stencil diffuse interface method is the combination of the diffuse interface method and a stencil adaptive algorithm, where the diffuse interface method is used as the solver, and the adaptive stencil refinement scheme is applied to improve the resolution around the interface so that the fine-scale interface behavior can be captured. In this paper, we use this method to simulate the dam break problem, study the dam height and leading edge position, and compare our results with the experiment data available in the literature. It is shown that the results using the adaptive stencil diffuse interface method agree very well with the experimental results.

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Numerical Simulation of Scouring in Overtopping Dam-break Flow

10.5194/egusphere-egu21-6798 ◽

2021 ◽

Author(s):

Can Huang ◽

Xiaoliang Wang ◽

Qingquan Liu

Keyword(s):

Numerical Simulation ◽

Empirical Relationship ◽

Dam Break ◽

Experimental Conditions ◽

Particle Hydrodynamics ◽

Smoothed Particle ◽

Dam Break Flow ◽

Scouring Process ◽

Overtopping Erosion ◽

Good Agreement

<p>Overtopping dam-break flow has great harm to the earthen embankments due to the hydraulic erosion. Some researchers have carried out relevant model experiments, but it is difficult to achieve the experimental conditions for the actual situation. The common numerical simulation is to express the scouring process through the empirical relationship, which obviously could not reflect the real scouring process. In this paper, a new overtopping erosion model using Smoothed Particle Hydrodynamics (SPH) is proposed. When the shear stress on the sediment SPH particle exceeds the critical stress, the erosion process begins. Then, when a sediment SPH particle is completely eroded, it will begin to move and is described as a non-Newtonian fluid. The un-incipient sediment particles are treated as boundary. This model is well validated with plane dike-breach experiment, and has also achieved a good agreement with erodible bed dam-break experiment.</p>

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An Approach Based on the Protected Object for Dam-Break Flood Risk Management Exemplified at the Zipingpu Reservoir

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph16193786 ◽

2019 ◽

Vol 16 (19) ◽

pp. 3786 ◽

Cited By ~ 1

Author(s):

Fan ◽

An ◽

Li ◽

Deng ◽

...

Keyword(s):

Numerical Simulation ◽

Risk Management ◽

Flood Risk ◽

Demographic Data ◽

Flood Risk Management ◽

Dam Break ◽

Risk Level ◽

Potential Hazard ◽

Administrative Division ◽

Protected Object

Dam-break flooding is a potential hazard for reservoirs that poses a considerable threat to human lives and property in downstream areas. Assessing the dam-break flood risk of the Zipingpu Reservoir in Chengdu, Sichuan Province, China, is critically important because this reservoir is located on the Longmen Shan fault, which experiences high seismic activity. In this paper, we develop an approach based on the protected object for dam-break flood risk management. First, we perform a numerical simulation of dam-break flooding in four possible dam break scenarios. Next, the flood areas are divided into 71 analysis units based on the administrative division. Based on the numerical simulation results and the socio-economic demographic data affected by a flood, the importance and risk level of each analysis unit is confirmed, and the flood risk map is established according to the classification results. Finally, multi-level flood risk management countermeasures are proposed according to the results of the unit classification shown in the map.

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