Junction Riemann problem for shallow water equations in networks

• Autorzy: Elshobaki Mohamed Abdelrehim Selim Ibrahim

Identyfikatory

DOI

10.17466/tq2018/22.1/a

• Języki publikacji: EN

Abstrakty

EN

In this paper, the Riemann solution of an extended Riemann problem in channel networks is presented. The Riemann problem at a junction network is well defined in the literature. However, it is limited to symmetric networks. Here, we extend the Riemann problem to non-symmetric networks such that neither the channel width equality nor the dischargee quality are assumed. The Riemann solution is given under subcritical flow conditions to ensurethe existence and uniqueness of the solution at the junction. Taking into account the massand energy conservation laws, the necessary conditions for the Riemann solution are drawn.The results are summarized in a theorem. The theorem is illustrated with a set of numerical examples.In order to perform a one-dimensional simulation in channel networks, the inner boundary conditions at the junction (i.e., the channel intersection point) are required. It has turned out that the classical models (i.e., the Equality, Gurram, Hsu models) that have been used to supplysuch a boundary suffer from many drawbacks.Thus, here we propose to use the Riemann solution at the junction networks to provideproper boundary conditions. Then, we compare all the junction models together. The junction models are validated against experimental results found in the literature for steady state flows.Generally, the Riemann model shows good results in matching the experimental data. In particular, the Riemann model shows the best results when the bottom discontinues at the junction. For the unsteady state flows, we perform prototype case studies to test the junction models in the channel networks, and the numerical solutions are compared with the analytical solutions. The Riemann model continues to show the best results that agree with the analytical solutions. However, the validation of the junction models in the unsteady state flows remains for future work due to the limited amount of real data.

Słowa kluczowe

EN

channel network; Riemann problem; subcritical flows; channel junctions; open channel flows

• Wydawca: Politechnika Gdańska
• Czasopismo: TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
• Rocznik: 2018
• Tom: Vol. 22. No 1
• Strony: 9--84
• Opis fizyczny: Bibliogr 84 poz., rys., tab.

Twórcy

autor

Elshobaki Mohamed Abdelrehim Selim Ibrahim

• University of L’Aquila, Department of Information Engineering, Computer Science and Mathematics Hydraulic Engineering Group via Vetoio (snc), Località Coppito, L’Aquila 67010, Italy

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).