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Explicit and Implicit Finite -Volume Methods for Depth Averaged Free-Surface Flows | ||
| Journal of Applied and Computational Mechanics | ||
| مقاله 20، دوره 6، Special Issue، اسفند 2020، صفحه 1270-1282 اصل مقاله (1.44 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22055/jacm.2020.32402.2008 | ||
| نویسندگان | ||
| Evangelia D. Farsirotou* 1؛ Alexander D. Panagiotopoulos2؛ Johannes V. Soulis2 | ||
| 1Department of Icthyology and Aquatic Environment, University of Thessaly, Fytoko st. N. Ionia, Volos, 38446, Greece | ||
| 2Department of Civil Engineering, Democrition University of Thrace, Fluid Mechanics/Hydraulic Division, Xanthi, 67100, Greece | ||
| چکیده | ||
| In recent years, much progress has been made in solving free-surface flow variation problems in order to prevent flood environmental problems in natural rivers. Computational results and convergence acceleration of two different (explicit and implicit numerical techniques) finite-volume based numerical algorithms, for depth-averaged subcritical and/or supercritical, free-surface, steady flows in channels, are presented. The implicit computational model is a bi-diagonal, finite-volume numerical scheme, based on MacCormack’s predictor-corrector technique and uses the semi-linearization matrices for the governing Navier-Stokes equations which are expressed in terms of diagonalization. This implicit numerical scheme puts primary emphasis to solution convergence using non-orthogonal local coordinate system. The explicit formulation uses volume integrals to solve the governing flow equations. Computational results and convergence performance between the implicit and the explicit finite-volume numerical schemes, for incompressible, viscous, depth-averaged free-surface, steady flows are presented. Implicit and explicit computational results are satisfactorily compared with available measurements. The implicit bi-diagonal technique yields fast convergence compared to the explicit one at the expense of programming effort. Iterations require to achieve convergence solution error of less than 10-5, can be reduced down to 90.0 % in comparison to analogous flows with using explicit numerical technique. | ||
| کلیدواژهها | ||
| Explicit Integral Method؛ Implicit Bidiagonal Finite-Volume؛ Water Depth | ||
| مراجع | ||
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