Dam-break flows during initial stage using SWE and RANS approaches

Özmen-Çağatay, Hatice; Kocaman, Selahattin

doi:10.1080/00221686.2010.507342

Cited by 112 publications

(85 citation statements)

References 15 publications

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“…It is clear that the 3D results exhibit some fluctuations on the water freesurface which are absent in the results obtained using the multi-layered model. These fluctuations are attributed to the turbulent effects accounted for in the 3D model and are in good agreement with the experimental data report in [21] for dam-break flows. To further quantify the results for this test example we compare in Figure 8 the velocity profiles at the location x = 8 obtained using the multi-layered shallow water equations to those obtained using TELEMAC-3D and the three-dimensional Navier-Stokes equations at time t = 14.…”

Section: Dam-break Problem On a Flat Bottomsupporting

confidence: 79%

A fast finite volume solver for multi-layered shallow water flows with mass exchange

Audusse¹,

Benkhaldoun²,

Sari³

et al. 2014

Journal of Computational Physics

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(2014) 'A fast nite volume solver for multi-layered shallow water ows with mass exchange.', Journal of computational physics., 272 . pp. 23-45. Further information on publisher's website:http://dx.doi.org/10.1016/j.jcp.2014.04.026Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Journal of Computational Physics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reected in this document. Changes may have been made to this work since it was submitted for publication. A denitive version was subsequently published in Journal of Computational Physics, 272, 2014Physics, 272, , 10.1016Physics, 272, /j.jcp.2014 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractA fast finite volume solver for hydrostatic multi-layered shallow water flows with mass exchange is investigated. In contrast to many models for multi-layered hydrostatic shallow water flows where the immiscible suppression is assumed, the present model allows for mass exchange between the layers. The multi-layered shallow water equations form a system of conservation laws with source terms for which the computation of the eigenvalues is not trivial. For most practical applications, complex eigenvalues may arise in the system and the multi-layered shallow water equations are not hyperbolic any more. This property makes the application of conventional finite volume methods difficult or even impossible for those methods which require in their formulation the explicit computation of the eigenvalues. In the current study, we propose a finite volume method that avoids the solution of Riemann problems. At each time step, the method consists of two stages to update the new solution. In the first stage, the multilayered shallow water equations are rewritten in a non-conservative form and the intermediate solutions are calculated using the method of characteristics. In the second stage, the numerical fluxes are reconstructed from the intermediate solutions in the first stage and used in the conservative form of the multi-layered shallow water equations. The proposed method is simple to implement, satisfies the conservation property and is suitable for multi-layered shallow water equations on non-flat topography. The proposed finite volume solver is verified against several benchmark tests and it shows good agreement with analytical solutions of the incompressible hydrostat...

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Section: Dam-break Problem On a Flat Bottomsupporting

confidence: 79%

A fast finite volume solver for multi-layered shallow water flows with mass exchange

Audusse¹,

Benkhaldoun²,

Sari³

et al. 2014

Journal of Computational Physics

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“…Actually, as already highlighted in literature (e.g. Ozmen-Cagatay & Kocaman, 2010;Shigematsu, Liu, & Oda, 2004), 1D depth-integrated numerical models fail to correctly describe dam-break phenomena near the gate site immediately after the gate opening, due to their inability to handle strong curvatures with non-zero vertical velocity components; moreover, the gate opening is not instantaneous as assumed in the numerical simulations, and may even induce small vibrations, which could locally affect data acquisition. At gauges G4 and G5 (Figs.…”

Section: Comparison Between Experimental Data and Numerical Simulationsmentioning

confidence: 95%

Validation of single- and two-equation models for transient mixed flows: a laboratory test case

Aureli

Dazzi

Maranzoni

et al. 2015

Journal of Hydraulic Research

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The numerical simulation of transient mixed flows requires suitable mathematical models that must be validated by comparison with experimental data. For this reason, a simple benchmark test case is proposed in this paper. A laboratory study was carried out in a circular conduit, specifically designed to induce a strong pipe filling bore and repeated regime transitions following the sudden opening of an internal gate. No gates or weirs were installed at the pipe ends, and ventilated conditions were guaranteed. Measurements of both pressure head and velocity are provided as supplementary material. The test case was simulated by using two finite volume shock-capturing schemes: a classic Preissmann slot model, and a recent twoequation model. In both cases, numerical results are in good agreement with experimental data, despite the low pressure wave celerity assumed to minimize spurious oscillations. When realistic celerity values are adopted, the two-equation model appears to be more robust in handling flow regime transitions.

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“…The cameras are JVC c920e with acquisition rate 25 frames per second and resolution 752x586 pixels. A complete description of the experimental setup and measurement techniques can also be seen in Ozmen-Cagatay and Kocaman [9][10][11][12][13][14][15][16][17][18].…”

Section: Fig1: Test Setup and Dam-break Mechanism [18]mentioning

confidence: 99%