Network Implementation of the Two-Component Pressure Approach for Transient Flow in Storm Sewers
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 2
Abstract
The two-component pressure approach (TPA) is an alternative to the Preissman slot method (PSM) for modeling highly transient sewer flow, including transitions between free-surface and pressurized conditions. TPA and PSM resolve intralink wave action by discretizing sewers with numerous elements and solving one-dimensional flow equations in contrast to link-node models, such as the popular storm water management model, which resolve only interlink wave action. Here, improvements of TPA are reported to support storm sewer network modeling. These include a source term discretization to preserve stationarity, a wetting and drying scheme, and a local time-stepping scheme to coordinate solution updates across many links and enable coupling to a two-dimensional overland flow model. A unique variant of the Harten, Lax and van Leer (HLL) Riemann solver is also introduced, and a boundary solver is developed to accommodate the wide range of possible flow regimes and transitions. The boundary solver is explicit to facilitate the extension of TPA to large networks and coupling with an overland flow model. Promising results are obtained in a varied set of test problems involving simple sewer networks.
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Acknowledgments
B.F.S. was supported by a grant from the National Science Foundation (Grant No. NSFCMMI 0825165), whose support is gratefully acknowledged. The authors thank J. Vasconcelos for graciously sharing experimental and modeling data reported in this paper, and Bernardo Trindade for reviewing the manuscript and offering suggestions for improvements.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 2 • February 2011
Pages: 158 - 172
Copyright
© 2011 ASCE.
History
Received: Dec 23, 2009
Accepted: Jun 18, 2010
Published online: Jun 22, 2010
Published in print: Feb 2011
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