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Numerical Investigation of a Hydropower Tunnel: Estimating Localised Head-Loss Using the Manning Equation

1
Division of Fluid and Experimental Mechanics, Luleå University of Technology, 97187 Luleå, Sweden
2
Vattenfall AB Research and Development, Älvkarleby Laboratory, 81470 Älvkarleby, Sweden
*
Author to whom correspondence should be addressed.
Water 2019, 11(8), 1562; https://doi.org/10.3390/w11081562
Received: 19 June 2019 / Revised: 17 July 2019 / Accepted: 20 July 2019 / Published: 29 July 2019
(This article belongs to the Section Hydraulics)
The fluid dynamics within a water tunnel is investigated numerically using a RANS approach with the k- ε turbulence model. The computational model is based on a laser scan of a hydropower tunnel located in Gävunda, Sweden. The tunnel has a typical height of 6.9 m and a width of 7.2 m. While the average cross-sectional shape of the tunnel is smooth the local deviations are significant, where some roughness elements may be in the size of 5 m implying a large variation of the hydraulic radius. The results indicate that the Manning equation can successfully be used to study the localised pressure variations by taking into account the varying hydraulic radius and cross-sectional area of the tunnel. This indicates a dominant effect of the tunnel roughness in connection with the flow, which has the potential to be used in the future evaluation of tunnel durability. ANSYS-CFX was used for the simulations along with ICEM-CFD for building the mesh. View Full-Text
Keywords: head-loss; case-study; hydropower; rock tunnel; surface roughness; ANSYS-CFX head-loss; case-study; hydropower; rock tunnel; surface roughness; ANSYS-CFX
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Andersson, L.R.; Hellström, J.G.I.; Andreasson, P.; Lundström, T.S. Numerical Investigation of a Hydropower Tunnel: Estimating Localised Head-Loss Using the Manning Equation. Water 2019, 11, 1562.

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