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Computation of laminar and turbulent water hammer flows
School of Mechanical Engineering, University of Tehran.
School of Mechanical Engineering, University of Tehran.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
School of Mechanical Engineering, University of Tehran.
2014 (English)Conference paper, Presentation (Refereed)
Abstract [en]

In this paper, the water hammer phenomenon in a pipeline is simulated using the full Reynolds-Averaged Navier-Stokes equations. The flow is considered to be compressible and the effect of pipe elasticity is taken into account by introducing the bulk modulus of elasticity in the solution procedure. Computations are performed both for laminar and turbulent flows. The high-Re RNG k-ε and the low-Re k-ω SST turbulence models are employed for turbulence modeling. Numerical results for both laminar and turbulent flows are compared with the available experimental data and numerical results in the literature. For the laminar flow test case, the head variation shows good agreement with the experimental data. Comparisons for turbulent test case show that the RNG k-ε model somewhat over-predicts the head variation. The low-Re k-ω SST model, in the other hand, produces more accurate wall shear stress distribution than the high-Re RNG k-ε model. This highlights the importance of implementation of low-Re turbulence models for the prediction of water hammer flows.

Place, publisher, year, edition, pages
Research subject
Fluid Mechanics
URN: urn:nbn:se:ltu:diva-28069Local ID: 1b8a82c9-cc8e-4eb9-878a-761eeeaa6cddOAI: diva2:1001263
WCCM-ECCM-ECFD 2014 Congress : 11th World Congress on Computational Mechanics (WCCM XI) 5th European Conference on Computational Mechanics (ECCM V) 6th European Conference on Computational Fluid Dynamics (ECFD VI) 20/07/2014 - 25/07/2014
Godkänd; 2014; 20140903 (cervante)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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