Evaluation of Unsteady Flow Resistances by Quasi-2D or 1D Models
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Volume 126, Issue 10
Abstract
This note considers the evaluation of resistances in unsteady flow by means of a 1D unsteady friction model. The model is applied for the case of a water hammer, both in a single gravity pipeline and in a single pumped pipeline. Comparisons with experimental results show that the model does not predict the exact shape of the oscillation, but it gives, with high precision, the maximums and minimums of the pressure head oscillation if correct values of the parameter of the model are used. Because experimental evaluations can be made only for a few cases and can give rise to very different values depending on experimental conditions, the sensitivity of the model to physical and numerical parameters that influence the phenomenon is examined by comparison with the results of a quasi-2D model previously proposed.
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Published In
Journal of Hydraulic Engineering
Volume 126 • Issue 10 • October 2000
Pages: 778 - 785
History
Received: Sep 9, 1996
Published online: Oct 1, 2000
Published in print: Oct 2000
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