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Computation of two- and three-dimensional water hammer flows
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics. School of Mechanical Engineering, College of Engineering, University of Tehran.
Hydraulic Machinery Research Institute, School of Mechanical Engineering, College of Engineering, University of Tehran.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics. Department of Energy and Process Engineering, Water Power Laboratory, Norwegian University of Science and Technology.ORCID iD: 0000-0001-7599-0895
Hydraulic Machinery Research Institute, School of Mechanical Engineering, College of Engineering, University of Tehran.
2018 (English)In: Journal of Hydraulic Research, ISSN 0022-1686, E-ISSN 1814-2079Article in journal (Refereed) Epub ahead of print
Abstract [en]

This paper investigates water hammer flows using two- and three-dimensional (2D and 3D) numerical simulations. The unsteady Reynolds-averaged Navier–Stokes (URANS) equations in conjunction with the k–ω SST turbulence model are employed for the computations. The valve modelling approach is used for 3D simulations, with superior agreement with the experiments. Similar predictions are obtained by 2D simulations and the flow rate reduction curve obtained from the 3D computations. The asymmetric flow patterns induced by the valve are confined within approximately one pipe diameter upstream of the valve. The contributions of inertia and pressure gradient terms are dominant at the instance of pressure wave passage, leading to abrupt changes in the fluid flow parameters. However, the effects of inertia and viscous shear stress terms are significant after the pressure wave passage, resulting in the flow tendency to approach a new steady condition. The viscous and turbulent dissipations are dominant close to and away from the wall, respectively.

Place, publisher, year, edition, pages
Taylor & Francis, 2018.
Keywords [en]
Ball valve modelling, fluid dynamics, laminar flow, three-dimensional numerical simulation, turbulent flow, two-dimensional numerical simulation, water hammer
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-70075DOI: 10.1080/00221686.2018.1459892OAI: oai:DiVA.org:ltu-70075DiVA, id: diva2:1230942
Available from: 2018-07-05 Created: 2018-07-05 Last updated: 2018-08-01

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Publisher's full texthttps://doi.org/10.1080/00221686.2018.1459892

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Saemi, SimindokhtCervantes, Michel J.

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