Experimental and Numerical Investigation
of Shock Wave Propagation Due to Dam-Break
Over a Wet Channel

Turhan, Evren; Özmen-Çağatay, Hatice; Kocaman, Selahattin

doi:10.15244/pjoes/92824

Cited by 13 publications

(3 citation statements)

References 29 publications

(48 reference statements)

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“…The jet-like rising of the fluid surface at early dam-break stages reported in the literature [8,17,32], see Fig. 13 (b), is also observed numerically, though not well predicted (not shown here), as the flow from the reservoir interacts with the downstream static-fluid.…”

Section: Case 2: Dam-break Flows Over An Inclined Wet Bedsupporting

confidence: 64%

Numerical simulations of dam-break flows of viscoplastic fluids via Shallow Water equations

Muchiri

Hewett

Sellier

et al. 2023

Preprint

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This paper presents simulations of channelized dam-break flows of Herschel–Bulkley viscoplastic fluids over complex topographies using the Shallow Water equations (SWEs). Particularly, the study aims at assessing the effects of rheological parameters: power-law index (n), consistency index (K) and yield stress (\tau_{c}), on the flow height and velocity over different topographies. Three practical examples of dam-break flow cases are considered: a dam-break on an inclined flat surface, a dam-break over a non-flat topography, and a dam-break over a wet bed. Effects of the bed slope and depth ratios between upstream and downstream fluid levels, on the flow behaviour are also analyzed. Numerical results are compared with experimental data from the literature, and are found to be in good agreement. Results show that for both dry and wet bed conditions, the fluid front position, the peak height, and mean velocity decrease when any of the three rheological parameters is increased. However, based on parametric sensitivity analysis, the power-law index appears to be the dominant factor in dictating the fluid behaviour. Moreover, increasing the bed slope and/or the depth ratio, the wave frontal position moves further downstream. Furthermore, the presence of an obstacle is observed to cause the formation of an upsurge that moves in the upstream direction; which increases by increasing any of the three rheological parameters. The study is useful for an in-depth understanding of the effects of rheology on catastrophic gravity driven flows of non-Newtonian fluids (like lava or mud flows) for risk assessment and mitigation.

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Section: Case 2: Dam-break Flows Over An Inclined Wet Bedsupporting

confidence: 64%

Numerical simulations of dam-break flows of viscoplastic fluids via Shallow Water equations

Muchiri

Hewett

Sellier

et al. 2023

Preprint

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show abstract

“…In the SPH method, between T = 15 and 20, it is seen that the fluid height increased at the initial stages but later, it decreased with time and also it is constant at H = 0.20. However, in the RANS method, the depth was observed to be higher than with the SPH (Turhan et al, 2019). At T = 20, the front of wave became vertical shape for the SPH due to the artificial viscosity coefficient.…”

Section: Resultsmentioning

confidence: 89%

Modeling Flood Shock Wave Propagation With the Smoothed Particle Hydrodynamics (Sph) Method: An Experimental Comparison Study

Turhan¹,

Özmen-Çağatay²,

Tantekin³

2019

Appl. Ecol. Env. Res.

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The applicability of experimental and numerical models used for the solution of dam-break flows is vital for better dam projects and also in preventing related accidents. The high cost and the timeconsuming nature of laboratory studies require consistency in the investigation of numerical models. In this study, the propagation of a flow using a fluid with a different density from that of normal water in the reservoir was investigated both experimentally and numerically. Salt water was preferred as a Newtonian fluid in order to observe the propagation of flows in different density after a sudden break. A small-scale channel was constructed and laboratory data were obtained using image processing techniques. For the numerical model, Smoothed-Particle Hydrodynamics (SPH) method and Reynolds Averaged Navier-Stokes (RANS) equations solved by Flow-3D software, were applied. Flow depth changes were observed in the reservoir and the downstream. The data obtained from all methods were compared with each other. The results of two numerical simulations point out that the disagreements on graphs in the time evolutions of the fluid levels in the SPH increase due to turbulence effects, whilst, these differences decrease in the RANS equations solved by Flow-3D software. Consequently, since the SPH provides taking the measures and developing intervention strategies to reduce the risks connected to the evolution of dam-break flows, it is thought that future validation studies of the model will be require with the use of data observed in this field.

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“…However, these methods have some restrictions, such as the lack of instability and consistency in tension due to the distortion of the material region, which can lead to low accuracy and problems in satisfying the required convergence. Artificial viscosity is considered as an important problem in the SPH (Smoother Particle Hydrodynamics) applications [20], [29]. Furthermore, for the FEM of particles, the mesh size and the number of the particles are considered as significant parameters [30].…”

Section: The Most Recent Examples Are Patel Milmet Embankmentmentioning

confidence: 99%

Numerical simulation of flow and dam body sediment over a movable bed due to an earthfill dam break

TAYFUR¹

2022

Sigma J Eng Nat Sci - Sigma Müh Fen Bil Derg

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This paper presents the numerical simulations of flow and dam body sediment transport over a movable bed due to an earthfill dam break. The RANS equations, together with the k-ω SST turbulent model, are employed. The phase characteristic parameter is used as the phases of air, water, sediment, and bulk of dam body. The system of equations is solved numerically using the PISO algorithm. The numerical model is first verified using the dam break experimental data from the literature. The model successfully captures the temporal changes in the measured flow depths, pressures, wave fronts, and arrival times. Th e ve rified mod el is the n app lied to simulate the flow and sediment transport as a result of an artificial earthfill dam break having an obstacle at its downstream section. The simulations show that there is a noticeable decrease in the shock pressures at all points around the obstacle and there is an increase in the water levels. The bulk dam body sediment moves together with the water fl ow wh ile sp reading. It takes longer time for the sediment laden flow to reach the obstacle. The investigation of dam body formed by different soils shows that the soil type has minor effect while the transport of sediment can raise the water levels and change the morphology of the downstream section.

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Experimental and Numerical Investigation of Shock Wave Propagation Due to Dam-Break Over a Wet Channel

Cited by 13 publications

References 29 publications

Numerical simulations of dam-break flows of viscoplastic fluids via Shallow Water equations

Numerical simulations of dam-break flows of viscoplastic fluids via Shallow Water equations

Modeling Flood Shock Wave Propagation With the Smoothed Particle Hydrodynamics (Sph) Method: An Experimental Comparison Study

Numerical simulation of flow and dam body sediment over a movable bed due to an earthfill dam break

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