Typology of the flow structures in dividing open channel flows

Momplot, Adrien; Kouyi, Gislain Lipeme; Mignot, Emmanuel; Rivière, Nicolas; Bertrand-Krajewski, Jean-Luc

doi:10.1080/00221686.2016.1212409

Cited by 23 publications

(11 citation statements)

References 21 publications

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“…The source term s D accounts for building drag forces. The dynamics of free surface ow in three and four branch crossroads has been studied extensively over the past years, from both an experimental and numerical point of view [7,9,10,17,22,23,24,25,27,28,31,32,33]. These studies have mainly focused on the ow distribution between the outowing branches of the crossroads (see e.g.…”

Section: Source Term Modelsmentioning

confidence: 99%

A critical assessment of flux and source term closures in shallow water models with porosity for urban flood simulations

Guinot

2017

Advances in Water Resources

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To cite this version:Vincent Guinot. A critical assessment of flux and source term closures in shallow water models with porosity for urban flood simulations. Advances in Water Resources, Elsevier, 2017, 109, pp.133-157 AbstractThe validity of ux and source term formulae used in shallow water models with porosity for urban ood simulations is assessed by solving the two-dimensional shallow water equations over computational domains representing periodic building layouts. The models under assessment are the Single Porosity (SP), the Integral Porosity (IP) and the Dual Integral Porosity (DIP) models. 9 dierent geometries are considered. 18 two-dimensional initial value problems and 6 two-dimensional boundary value problems are dened. This results in a set of 96 ne grid simulations. Analysing the simulation results leads to the following conclusions: (i) the DIP ux and source term models outperform those of the SP and IP models when the Riemann problem is aligned with the main street directions, (ii) all models give erroneous ux closures when is the Riemann problem is not aligned with one of the main street directions or when the main street directions are not orthogonal, (iii) the solution of the Riemann problem is self-similar in space-time when the street directions are orthogonal and the Riemann problem is aligned with one of them, (iv) a momentum balance conrms the existence of the transient momentum dissipation model presented in the DIP model, (v) none of the source term models presented so far in the literature allows all ow congurations to be accounted for(vi) future laboratory experiments aiming at the validation of ux and source term closures should focus on the high-resolution, two-dimensional monitoring of both water depth and ow velocity elds.

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Section: Source Term Modelsmentioning

confidence: 99%

A critical assessment of flux and source term closures in shallow water models with porosity for urban flood simulations

Guinot

2017

Advances in Water Resources

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“…Note that in the case of a 1D model, the red curve on figure 4 (top), corresponding to the experimental flow lines averaged in width, show a convexity in water height profiles along this street downstream each crossroad where a recirculation area appears (cf. [29]). In such case the effective flow vein is narrowed and the flow accelerates; with a contraction coefficient 0 < α < 1 the effective cross sectional area A f lowvein = αA f ullwidth .…”

Section: Head Losses Modellingmentioning

confidence: 99%

Variance based sensitivity analysis of 1D and 2D hydraulic models: An experimental urban flood case

Chen

Garambois

Finaud-Guyot

et al. 2018

Environmental Modelling & Software

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“…A clockwise secondary motion cell is along the outer wall of the branch channel and a counterclockwise secondary motion cell in the main channel occurs after the intake and along the inner wall (Montaseri et al 2019). Two recirculation structures in the lateral flow are occurred, and the recirculation structures are helix-shaped and closed (Momplot et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic characteristics of lateral withdrawal with effects of the slope ratio

Zhao

Zhang

et al. 2021

Journal of Water Supply: Research and Technology-Aqua

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Lateral withdrawal is widely performed in water transfer and water supply projects. Hydrodynamic characteristics of intake are crucial to safe and stable operation. In this study, a 3-D numerical volume of fluid model was established and validated through experimental tests. Hydrodynamic characteristics and secondary flow were investigated under scenarios with the vertical slope and different slope ratios. The helix-shaped recirculation and surface vortex are generated, and the secondary flow near the surface layer is more serious. Adding a slope ratio is beneficial to improve the flow patterns and recirculation, while the surface vortex width increases. Additionally, with the decrease in the slope ratio, recirculation width and the ratio of recirculation to the width of the layer decrease, and the minimum values are 9.19 cm and 22.97%, respectively. However, the lower the slope ratio is, the greater recirculation inhibition affects are, and the more serious the surface vortex is. With the decrease in the slope ratio, the widest surface vortex width and the ratio of the widest surface vortex to the width of the layer increase from 6.1 to 12 cm and from 7.82 to 17.14%, respectively. This research represents an advance in lateral withdrawal and provides support for further designs.

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Typology of the flow structures in dividing open channel flows

Cited by 23 publications

References 21 publications

A critical assessment of flux and source term closures in shallow water models with porosity for urban flood simulations

A critical assessment of flux and source term closures in shallow water models with porosity for urban flood simulations

Variance based sensitivity analysis of 1D and 2D hydraulic models: An experimental urban flood case

Hydrodynamic characteristics of lateral withdrawal with effects of the slope ratio

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