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Illinois Transient Model: Simulating the Flow Dynamics in Combined Storm Sewer Systems

Arturo Leon, Nils Oberg, Arthur R. Schmidt and Marcelo H. Garcia (2011)
Oregon State University; University of Illinois
DOI: https://doi.org/10.14796/JWMM.R241-02
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Abstract

This chapter describes the capabilities and features of the recently developed Illinois transient model (ITM) for simulating the flow dynamics (transient and non-transient conditions) in combined storm sewer systems, ranging from dry bed flows, to gravity flows, to partly gravity partly surcharged flows (mixed flows), to fully pressurized flows (water hammer flows). ITM, which was originally developed at the University of Illinois at Urbana-Champaign, is a finite volume (FV) model that can handle complex boundary conditions such as drop shafts, reservoirs, closing and opening of gates as a function of time, and junctions with any number of connecting pipes and any types of horizontal and vertical alignment. ITM is open source code that is in constant development and its releases are made available on a regular basis. In the current version of ITM (v. 1.3, September 2010), the free surface region is modeled using the one dimensional (1-D) Saint-Venant equations. The pressurized region is modeled using the 1-D compressible water hammer equations. Open channel pressurized flow (mixed flow) interfaces are modeled by enforcing mass, momentum and energy relations across the interfaces together with Riemann solvers at the sides of mixed flow interfaces. This version of ITM is referred to as the two equation model. The current version of ITM is superior to other models of its kind because it is robust, can simulate mixed flows (simultaneous occurrence of free surface and pressurized flows) when using actual pressure wave celerities (~1 000 m/s), and because no Preissmann slot assumption is made to simulate pressurized flows (water hammer flows). ITM has been applied to several existing combined sewer systems in the U.S. and around the world, to improve the understanding of the flow dynamics of these systems.

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PAPER INFO

Identification

CHI ref #: R241-02 735
Volume: 19
DOI: https://doi.org/10.14796/JWMM.R241-02
Cite as: CHI JWMM 2011;R241-02

Publication History

Received: N/A
Accepted: N/A
Published: February 15, 2011

Status

# reviewers: 2
Version: Final published

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© 2011 CHI. Some rights reserved.

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Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

The Journal of Water Management Modeling is an open-access (OA) publication. Open access means that articles and papers are available without barriers to all who could benefit from them. Practically speaking, all published works will be available to a worldwide audience, free, immediately on publication. As such, JWMM can be considered a Diamond, Gratis OA journal.

All papers published in the JWMM are licensed under a Creative Commons Attribution 4.0 International License (CC BY).

JWMM content can be downloaded, printed, copied, distributed, and linked-to, when providing full attribution to both the author/s and JWMM.


AUTHORS

Arturo Leon

Oregon State University, Corvallis, OR, USA
ORCiD:

Nils Oberg

University of Illinois, Urbana, IL, USA
ORCiD:

Arthur R. Schmidt

University of Illinois, Urbana, IL, USA
ORCiD:

Marcelo H. Garcia

University of Illinois, Urbana, IL, USA
ORCiD:


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