Three-dimensional non-hydrostatic model for dam-break flows

Ai, Congfang; Ma, Yuxiang; Ding, Weiye; Xie, Zhihua; Dong, Guohai

doi:10.1063/5.0081094

Cited by 16 publications

(2 citation statements)

References 77 publications

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“…This work must be viewed as an embryonic step so as to improve flood forecasting in the future. Additionally, the present results offer benchmark data for future numerical investigations given the increased focus on modeling and simulating dam-break problems 61,[81][82][83][84][85][86] over obstructions and vegetated bed scenarios. [87][88][89][90] The need to move beyond wall friction representation for energy losses is recognized in large scale models but alternatives remain in short supply.…”

Section: Conclusion and Broader Implicationsmentioning

confidence: 91%

The advancing wave front on a sloping channel covered by a rod canopy following an instantaneous dam break

Buono,

Katul,

Poggi

2024

Physics of Fluids

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The drag coefficient Cd for a rigid and uniformly distributed rod canopy covering a sloping channel following the instantaneous collapse of a dam was examined using flume experiments. The measurements included space x and time t high resolution images of the water surface h(x, t) for multiple channel bed slopes So and water depths behind the dam Ho along with drag estimates provided by sequential load cells. Using these data, an analysis of the Saint-Venant equation (SVE) for the front speed was conducted using the diffusive wave approximation. An inferred Cd=0.4 from the h(x, t) data near the advancing front region, also confirmed by load cell measurements, is much reduced relative to its independently measured steady-uniform flow case. This finding suggests that drag reduction mechanisms associated with transients and flow disturbances are more likely to play a dominant role when compared to conventional sheltering or blocking effects on Cd examined in uniform flow. The increased air volume entrained into the advancing wave front region as determined from an inflow–outflow volume balance partly explains the Cd reduction from unity.

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Section: Conclusion and Broader Implicationsmentioning

confidence: 91%

The advancing wave front on a sloping channel covered by a rod canopy following an instantaneous dam break

Buono,

Katul,

Poggi

2024

Physics of Fluids

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“…In some cases, 3D LES models were successfully used to simulate the interaction of buoyancy driven flows with isolated and series of obstacles (Constantinescu, 2014; Gonzalez‐Juez et al., 2010; La Forgia et al., 2018; Tokyay et al., 2011, 2012, 2014; Tokyay & Constantinescu, 2015). A main challenge when applying such models to dam‐break flows is that the dynamics of the interface between the wave fluid and the air needs to be solved using a separate mode (Ai et al., 2022). One of the most used techniques for tracking the free surface in dam‐break applications is the Volume of Fluid (VOF) method (Biscarini et al., 2010; Munoz & Constantinescu, 2020; Marsooli & Wu, 2014; Ozmen‐Cagatay & Kocaman, 2011).…”

Section: Introductionmentioning

confidence: 99%

Modelling the impact of a dam‐break wave on a vertical wall

Del Gaudio,

La Forgia,

Constantinescu

et al. 2024

Earth Surf Processes Landf

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SummaryDam‐Break waves arise from the sudden release of the water stored behind a wall, and they cause destruction and losses on nearby areas. Characterisation of the impact force on obstacles is very important for risk assessment. In this work, we performed a series of lock‐release experiments to evaluate the wave‐induced impact force on a vertical end wall situated some distance from the lock. Laboratory data were used to evaluate the performance of several types of numerical models to predict the wave‐induced force on the vertical end wall. The selected models were as follows: the hydrostatic 1D De Saint‐Venant model, the multi‐layer hydrostatic model and the Navier–Stokes two‐phase flow. For the latter two models, both 2D (in the ‐ plane) and 3D simulations were performed. The results show that, independently of the hydrostatic assumption, the 2‐D simulations generate nonphysical oscillations which are not present in the measured temporal histories of the pressure and force values. By contrast, the predictions of both 3D numerical models better reproduce the temporal variation of the pressure forces on the end wall. The present study also shows that from a practical point of view, the 1D De Saint‐Venant model predicts with sufficient accuracy the impact time and the magnitude of the peak value of the impact force. Therefore, if the use of a fully 3D models is not a feasible option, in terms of a trade‐off between computation cost and accuracy, the use of a simple hydrostatic 1D De Saint‐Venant model is preferable to a 2D model.

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