Abstract
Effective modeling of pipe network anomalies can supplement fluid transient diagnostic techniques. This study focuses on comparing modeling approaches for predicting the transient response due to air pockets entrapped outside the main flow path (offline), in particular testing the assumption that the flow inside the cavity can be predicted based on a lumped element. This assumption has been consistently made in previous modeling investigations in the time and frequency domains. The results are compared to a system frequency response model without the lumped inertia assumption by quantifying timing and signal frequency distribution errors. It is found that removing the lumped inertia assumption improved the prediction of the reflected and transmitted pulse frequency distributions by averages of 50% and 30%–35%, respectively.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
We would like to thank Hong Kong Research Grants Council for the theme based research scheme (TRS) Grant No. T21-602/15R for supporting this research.
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© 2021 American Society of Civil Engineers.
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Received: Jun 3, 2020
Accepted: Nov 19, 2020
Published online: Mar 10, 2021
Published in print: May 1, 2021
Discussion open until: Aug 10, 2021
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