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Numerical investigation of a hydropower tunnel: Estimating localised head-loss using the manning equation
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-9426-2375
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0002-8360-9051
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics. Vattenfall AB Research and Development, Älvkarleby Laboratory, Älvkarleby.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0002-1033-0244
2019 (English)In: Water, ISSN 2073-4441, E-ISSN 2073-4441, no 8, article id 1562Article in journal (Refereed) Published
Abstract [en]

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. 

Place, publisher, year, edition, pages
MDPI, 2019. no 8, article id 1562
Keywords [en]
ANSYS-CFX, Case-study, Head-loss, Hydropower, Rock tunnel, Surface roughness
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-75622DOI: 10.3390/w11081562Scopus ID: 2-s2.0-85070288117OAI: oai:DiVA.org:ltu-75622DiVA, id: diva2:1344499
Note

Validerad;2019;Nivå 2;2019-08-21 (svasva)

Available from: 2019-08-21 Created: 2019-08-21 Last updated: 2019-08-21Bibliographically approved

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Andersson, RobinHellström, J. Gunnar I.Andreasson, PatrikLundström, Staffan

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