Abstract
A novel numerical model for describing highly transient mixed flows is presented based on the Preissmann slot approach. To overcome the spurious oscillation problems caused by this approach, a numerical scheme named “random choice method” (RCM), in which flow variables of the next time level are obtained by picking a local Riemann solution state at random, is applied herein. Three numerical tests are performed to verify the ability of the proposed model in simulating from single flows to mixed flows. The results show that the RCM gives sharper shock resolutions as compared with the Godunov-type scheme, which causes the smearing of discontinuities. The proposed model can eliminate the numerical oscillations under flow conditions of switching from free-surface flow to pressurized flow, because of its unconditional stability. On further analysis of the experimental verifications, a hybrid method is presented to improve the performance of RCM in the smooth (nonuniform) parts of the flow.
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Data Availability Statement
The study’s data are available from the corresponding author by request.
Acknowledgments
The writers gratefully acknowledge the financial support for this research from the Fundamental Research Funds for the Central Universities (Grant Nos. B200203060 and 2018B43114), Graduate Research and Innovation Project of Jiangsu Province (Grant No. KYCX20_0473), National Natural Science Foundation of China (Grant Nos. 51839008 and 51679066), and Fok Ying Tong Education Foundation (Grant No. 161068).
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Published In
Journal of Hydraulic Engineering
Volume 149 • Issue 8 • August 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Dec 9, 2022
Accepted: Apr 13, 2023
Published online: Jun 5, 2023
Published in print: Aug 1, 2023
Discussion open until: Nov 5, 2023
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