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Fluids 2018, 3(3), 64; https://doi.org/10.3390/fluids3030064

Implementation and Validation of a Free Open Source 1D Water Hammer Code

1
Aalborg University Esbjerg, Niels Bohrs Vej 8, 6700 Esbjerg, Denmark
2
Department of Energy Technology, Aalborg University Esbjerg, Niels Bohrs Vej 8, 6700 Esbjerg, Denmark
3
Studies & FEED, Field Development, Rambøll Energy, Bavnehøjvej 5, 6700 Esbjerg, Denmark
Current address: Process Department, Field Development, Rambøll Energy, Bavnehøjvej 5, 6700 Esbjerg, Denmark.
*
Author to whom correspondence should be addressed.
Received: 9 August 2018 / Revised: 24 August 2018 / Accepted: 29 August 2018 / Published: 3 September 2018
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Abstract

This paper presents a free code for calculating 1D hydraulic transients in liquid-filled piping. The transient of focus is the Water Hammer phenomenon which may arise due to e.g., sudden valve closure, pump start/stop etc. The method of solution of the system of partial differential equations given by the continuity and momentum balance is the Method of Characteristics (MOC). Various friction models ranging from steady-state and quasi steady-state to unsteady friction models including Convolution Based models (CB) as well as an Instantaneous Acceleration Based (IAB) model are implemented. Furthermore, two different models for modelling cavitation/column separation are implemented. Column separation may occur during low pressure pulses if the pressure decreases below the vapour pressure of the fluid. The code implementing the various models are compared to experiments from the literature. All experiments consist of an upstream reservoir, a straight pipe and a downstream valve. View Full-Text
Keywords: water hammer; unsteady friction; fluid transients; method of characteristics; column separation; cavitation; numerical simulation water hammer; unsteady friction; fluid transients; method of characteristics; column separation; cavitation; numerical simulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kjerrumgaard Jensen, R.; Kær Larsen, J.; Lindgren Lassen, K.; Mandø, M.; Andreasen, A. Implementation and Validation of a Free Open Source 1D Water Hammer Code. Fluids 2018, 3, 64.

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