Numerical Investigation of Natural Rough-Bed Flow
| Autor: | Agostino Lauria, Roberto Gaudio, Giancarlo Alfonsi, Domenico Ferraro |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Lecture Notes in Computer Science ISBN: 9783030406158 NUMTA (2) |
| DOI: | 10.1007/978-3-030-40616-5_21 |
| Popis: | The turbulent flow in natural rough-bed watercourses is a rather complex phenomenon, still poorly investigated. The majority of the existing works on this subject is of experimental nature, while the numerical ones are mostly related to artificially and regularly-roughened beds. In the present work a numerical investigation is carried out, in which the fully turbulent flow in an open channel is simulated, where the channel bottom is constituted by natural-pebble layers. In the numerical simulations, the Large Eddy Simulation (LES) approach is used, in conjunction with the Wall-Adapting Local Eddy viscosity (WALE) Sub-Grid Scale (SGS) closure model at Reynolds number 46,500 and Froude number 0.186. The Finite-Volume discretized governing equations are solved numerically by means of the InterFOAM solver, embedded in the OpenFOAM C++ digital library. In order to take into account the free-surface dynamics, the Volume of Fluid (VoF) method has been used. The results of the simulations are compared with those obtained in a companion experiment, mainly in terms of turbulence statistics of different order, obtaining a rather good agreement. |
| Databáze: | OpenAIRE |
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