2008
DOI: 10.3826/jhr.2008.3326
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Integration of unsteady friction models in pipe flow simulations

Abstract: Various approaches to integrate instantaneous acceleration models are examined. The basic physical model consists of the one-phase flow water hammer equations with the unsteady wall friction model of Brunone. The numerical scheme is based on characteristic upwind finite differences, representing an extension of the Godunov schemes to the non-conservative hyperbolic equations. The most accurate solutions result from the basic version of this method, which takes into account the effects of spatial and temporal d… Show more

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Cited by 8 publications
(1 citation statement)
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References 27 publications
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“…These assumptions cause minor errors in common engineering problems, except for the last two hypotheses. On the one hand, the modeling of unsteady friction was found to reduce the initial flow acceleration ( [17]), and to attenuate the magnitude of pressure spikes during fluid hammer ( [18][19][20][21]). On the other hand, if cavitation or column separation occurs, they must be accounted for with additional conditions to be satisfied, such as in the discrete vapor cavity model, the discrete gas cavity model, and the generalized interface vaporous cavitation model.…”
mentioning
confidence: 99%
“…These assumptions cause minor errors in common engineering problems, except for the last two hypotheses. On the one hand, the modeling of unsteady friction was found to reduce the initial flow acceleration ( [17]), and to attenuate the magnitude of pressure spikes during fluid hammer ( [18][19][20][21]). On the other hand, if cavitation or column separation occurs, they must be accounted for with additional conditions to be satisfied, such as in the discrete vapor cavity model, the discrete gas cavity model, and the generalized interface vaporous cavitation model.…”
mentioning
confidence: 99%