Systematic Evaluation of One-Dimensional Unsteady Friction Models in Simple Pipelines
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Volume 132, Issue 7
Abstract
In this paper, basic unsteady flow types and transient event types are categorized, and then unsteady friction models are tested for each type of transient event. One important feature of any unsteady friction model is its ability to correctly model frictional dissipation in unsteady flow conditions under a wide a range of possible transient event types. This is of importance to the simulation of transients in pipe networks or pipelines with various devices in which a complex series of unsteady flow types are common. Two common one-dimensional unsteady friction models are considered, namely, the constant coefficient instantaneous acceleration-based model and the convolution-based model. The modified instantaneous acceleration-based model, although an improvement, is shown to fail for certain transient event types. Additionally, numerical errors arising from the approximate implementation of the instantaneous acceleration-based model are determined, suggesting some previous good fits with experimental data are due to numerical error rather than the unsteady friction model. The convolution-based model is successful for all transient event types. Both approaches are tested against experimental data from a laboratory pipeline.
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Acknowledgments
The writers would like to acknowledge financial support from the Australian Research Council and a scholarship provided by the Australian Government for the first writer, the assistance of both are gratefully appreciated.
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Information
Published In
Journal of Hydraulic Engineering
Volume 132 • Issue 7 • July 2006
Pages: 696 - 708
Copyright
© 2006 ASCE.
History
Received: Apr 1, 2003
Accepted: May 31, 2005
Published online: Jul 1, 2006
Published in print: Jul 2006
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