Numerical Study of the Dynamics and Structure of a Partial Dam-Break Flow Using the VOF Method

Khoshkonesh, Alireza; Nsom, Blaise; Bahmanpouri, Farhad; Dehrashid, Fariba Ahmadi; Adeli, Atefeh

doi:10.1007/s11269-021-02799-2

Cited by 21 publications

(9 citation statements)

References 32 publications

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“…Accordingly, a change in ow energy can lead to the formation and development of oblique and moving hydraulic jumps, secondary ows, ow separation, and turbulence. These phenomena have been described in previous experimental and numerical dambreak studies (Fraccarollo and Toro 1995; Soares-Frazao and Zech 2007; Kocaman and Guzel 2011; Kocaman and Ozmen-Cagatay 2012; Kocaman et al 2020;Khoshkonesh et al 2021). In addition, dense and rigid vegetation increases resistance to ow development during a dam break.…”

Section: Introductionsupporting

confidence: 71%

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Study of dam-break flow over a vegetated channel with and without a drop

Khoshkonesh

Sadeghi²,

Gohari

et al. 2022

Preprint

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The development of catastrophic floods triggered by a dam failure is influenced by the river's bed nonuniformity, infrastructure, and vegetation in the main channel or floodplain. This study examined the effects of the presence of a drop and its direction in a vegetated channel on flow characteristics during dam failure. A CFD package was used for all dam break flow simulations. Using experimental data from the literature, a sensitivity analysis of the fluid cell size and turbulence models were performed. Then, the model was used to predict the flow characteristics during a dam break over the vegetated channel with positive, negative, and no drops. The results showed that the model reproduced with high accuracy the evolution of the flow during a dam break in the presence of an obstacle and transitions, as well as variations in flow velocity. The presence of a drop, its height and direction, and vegetation significantly changed the reservoir discharge, hydrograph in the downstream channel, flow velocity values, location of the inflection points, density, and eddy evolution.

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Section: Introductionsupporting

confidence: 71%

“…In the model LES, the turbulent structures that are resolvable within the computational domain are computed directly, while the structures that are too small for direct resolution are computed approximately (Eq. ( 7)) (Khoshkonesh et al 2021).…”

Section: Turbulence Modelsmentioning

confidence: 99%

Study of dam-break flow over a vegetated channel with and without a drop

Khoshkonesh

Sadeghi²,

Gohari

et al. 2022

Preprint

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“…Water 2023, 15, x FOR PEER REVIEW 9 of 24 The failure of an actual embankment dam occurs gradually due to the time-dependent growth of a breach [11,19]. In the analysis conducted in this study, the breach formation was modelled by introducing moving parts into the system.…”

Section: Three-dimensional Reynolds-averaged Navier-stokes Equationsmentioning

confidence: 99%

“…These parts were assigned various speeds in the vertical and horizontal directions to achieve the desired final breach width and opening time for each scenario. When the simulations were performed, visualizations of the dam body and water flow were obtained The failure of an actual embankment dam occurs gradually due to the time-dependent growth of a breach [11,19]. In the analysis conducted in this study, the breach formation was modelled by introducing moving parts into the system.…”

Section: Three-dimensional Reynolds-averaged Navier-stokes Equationsmentioning

confidence: 99%

“…Experimental studies on dam breaks have been used not only to focus on hydraulic parameters such as the breach geometry, time-varying outflow hydrograph, flow velocity, and flow depths, but also to validate numerical simulations related to dam breaks [19,20]. Bella et al [21] experimentally investigated the case of a sudden dam break in straight and curved horizontal channels.…”

Section: Introductionmentioning

confidence: 99%

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2D and 3D Numerical Simulation of Dam-Break Flooding: A Case Study of the Tuzluca Dam, Turkey

Akgun,

Nas,

Uslu

2023

Water

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Unlike river floods, floods caused by dam breaks occur much more abruptly and at higher water velocities. The failure of a dam due to any reason can pose a significant threat to settlements in the downstream area due to the high volume of water in its reservoir. In this case study, 2D and 3D numerical failure simulations of Tuzluca Dam, to be built in the Igdir province of Turkey, was performed using the Flow3D Hydro software. The Shallow Water and Reynolds-Averaged Navier-Stokes (RANS) equations were used to simulate flood propagation. In the numerical models, RNG k-ε was chosen as the turbulence model. In the analyses carried out under different scenarios, it was observed that in both methods (2D and 3D), significant flood depths would occur in two downstream village settlements. Within the scope of the study, the mortality rates in different dam-break scenarios of the Tuzluca Dam were also investigated. It has been observed that the dam failure time and breach geometry have a significant impact on the flood propagation and the loss of life in settlements. Additionally, a dam-break experiment in literature dam-break experiment was numerically solved using the Flow3D Hydro software to validate the numerical model, and a satisfactory harmony was observed between the experimental results and the numerical models. Although the 3D analysis provided a more accurate representation of the experimental results, it took approximately 20 times longer to complete the dam failure simulation in the case study compared to the 2D model. As a result, it has been determined that for comprehensive studies such as those of dam failures, 2D analyses may be more practical, while for smaller-scale scenarios or situations requiring greater precision, 3D modelling is appropriate.

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