Multiple solutions of the Navier-Stokes equations computing water flow in sand traps
| Autor: | Silje Kreken Almeland, Kari Bråveit, Pravin Raj Aryal, Nils Reidar Bøe Olsen |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
multiple solutions
General Computer Science Discretization khimti hydro power plant Water flow Upwind scheme 02 engineering and technology Computational fluid dynamics 01 natural sciences 010305 fluids & plasmas 0203 mechanical engineering 0103 physical sciences Navier–Stokes equations cfd Turbulence business.industry Mechanics sand trap Current (stream) numerical modeling 020303 mechanical engineering & transports tonstad hydro power plant lcsh:TA1-2040 Modeling and Simulation lcsh:Engineering (General). Civil engineering (General) business Geology Communication channel |
| Zdroj: | Engineering Applications of Computational Fluid Mechanics Engineering Applications of Computational Fluid Mechanics, Vol 13, Iss 1, Pp 199-219 (2019) |
| Popis: | Two cases are presented wherein the main flow pattern in sand traps changes considerably as a function of discretization scheme, grid resolution and turbulence model. Both cases involve channel flows directed into a desilting basin, where the main current changes from one part of the geometry to the other. The CFD computations are validated with field or laboratory measurements. The first case presented is one of the sand traps of Khimti hydro power plant in Nepal. According to the laboratory measurements, the recirculation zone for this case is close to the bed, with the main current following the water surface. This is reproduced by the numerical model when using a first-order upwind scheme. Using a second-order upwind scheme, the main current is close to the bed, and the recirculation is formed at the surface. The second case is one of the sand traps of Tonstad hydro power plant in Norway. CFD computations predict the main flow field to follow the right or the left sides or the centre of the expansion region, depending on the discretization scheme, grid resolution and turbulence model. Field measurements show that the main current follows the centre of the expansion zone. © 2019 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Databáze: | OpenAIRE |
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