Surging in Urban Storm Drainage Systems

Guo, Qizhong; Song, Charles C. S.

doi:10.1061/(asce)0733-9429(1990)116:12(1523)

Cited by 93 publications

(44 citation statements)

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“…Image from a video record of a geyser event in a stormwater tunnel in Minneapolis, Minnesota (videos recorded by St. Anthony Falls Hydraulics Laboratory, University of Minnesota) major transient conditions that must be considered in the design of these systems; namely preventing large surges caused by pressurization and the avoidance of geysering (discussed by Guo and Song [4]). Both phenomena result from the transition of the tunnel from a free surface flow state to a pressurized one, especially under rapid filling conditions.…”

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“…Both phenomena result from the transition of the tunnel from a free surface flow state to a pressurized one, especially under rapid filling conditions. Although the geysering phenomenon has been discussed extensively in the literature (a photograph of an event is included in Guo and Song [4]), the physics behind the event have been little discussed. Most discussions appear to presume that the geyser is a jet of water rising up a vertical shaft (to provide ventilation, for example) connected to the tunnel.…”

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Flow regime transition mechanisms in rapidly filling stormwater storage tunnels

et al. 2008

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An issue in the design of combined sewer overflow storage tunnels is to avoid "geysering" which is an air/water mixture blowing up through vertical shafts connected to the tunnel. Studies indicate that the origin of this phenomenon is the entrapment of large air pockets as the rapidly filling tunnel undergoes a transition between free surface and pressurized flow. Commonly implemented numerical models are of the shock fitting type that tracks the location of a pipe filling bore. However, the flow regime transition does not have to occur through a pipe filling bore. Another possibility involves a free surface bore with a following gradual transition to a full pipe condition. Large air volumes may be trapped in this situation following the bore reflection off a tunnel transition if this reflection closes the flow cross-section. Experimental observations are presented to demonstrate both types of flow regime transition. Traditional shock fitting methods are ill-equipped to accurately simulate gradual flow regime transitions. The shock capturing method proposed by Vasconcelos et al. (J Hydraul Eng 132(6):553-562, 2006) is demonstrated to be capable of resolving both types of observed bores.

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Flow regime transition mechanisms in rapidly filling stormwater storage tunnels

et al. 2008

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“…A more capable type of shock-fitting model is represented by the fulldynamic approach used by Song et al (1983), Cardle and Song (1988), Guo and Song (1990), among others. The main difference is that such models use the MOC both in the pressurized and free-surface portions of the flow.…”

Section: Model Approaches For Flow Regime Transitionmentioning

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Current Issues on Modeling Extreme Inflows in Stormwater Systems

Vasconcelos

Wright

Roe

2006

JWMM

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The increasing availability of different numerical models to simulate flow in storm sewers has raised several questions on the applicability of these models in the simulation of extreme inflow conditions. These issues include accurate modeling and prediction of bores, flow regime transition into pressurized flow and the possibility of air pocket entrapment and the subsequent effect on the system. With regards to bore description, the issue is not limited to the choice of equations for the problem solution, but includes the selection of numerical schemes that will ensure the correct bore propagation speed. It will be shown that the selection of the variables used to solve the mass and momentum equations has an impact in the solution of discontinuous flows. It will also be seen that numerical models without shock-capturing capabilities have limited ability to model flow discontinuities.Flow regime transition models can be divided into shock-fitting or shock-capturing approaches, each group of approaches with particular strengths and limitations. Due to the popularity of Preissmann slot-based models, including the soon-to-be released SWMM 5, a more detailed discussion on the issues of this approach is provided. Some new model improvements to shock-capturing approaches are presented, including a new conceptual model for simulating sewer surcharging referred to as the Decoupled Pressure Approach.

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“…When the advancing column is suddenly stopped (fully or partially), severe pressure changes will occur in the system (see e.g. Guo and Song 1990, De Martino et al 2008, Bergant et al 2010, Bergant et al 2011, Martin and Lee 2012.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Rapid Filling of a Large-Scale Pipeline

et al. 2014

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. ABSTRACTThis study presents results from detailed experiments of the two-phase pressurized flow behavior during the rapid filling of a large-scale pipeline. The physical scale of this experiment is close to the practical situation in many industrial plants. Pressure transducers, water level meters, thermometers, void fraction meters and flow meters were used to measure the two-phase unsteady flow dynamics. The main focus is on the water-air interface evolution during filling and the overall behavior of the lengthening water column. It is observed that the leading liquid front does not entirely fill the pipe cross section; flow stratification and mixing occurs. Although flow regime transition is a rather complex phenomenon, certain features of the observed transition pattern are explained qualitatively and quantitatively. The water flow during the entire filling behaves as a rigid column as the open empty pipe in front of the water column provides sufficient room for the water column to occupy without invoking air compressibility effects. As a preliminary evaluation of how these large-scale experiments can feed into improving mathematical modeling of rapid pipe filling, a comparison with a typical one-dimensional rigid-column model is made.

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Surging in Urban Storm Drainage Systems

Cited by 93 publications

References 4 publications

Flow regime transition mechanisms in rapidly filling stormwater storage tunnels

Flow regime transition mechanisms in rapidly filling stormwater storage tunnels

Current Issues on Modeling Extreme Inflows in Stormwater Systems

Experimental Investigation on Rapid Filling of a Large-Scale Pipeline

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