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Two-dimensional hydrodynamic modelin...

Shao, Zhiyu Shannon,

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Two-dimensional hydrodynamic modeling of two-phase flow for understanding geyser phenomena in urban stormwater system /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Two-dimensional hydrodynamic modeling of two-phase flow for understanding geyser phenomena in urban stormwater system // Zhiyu Shannon Shao.
Author:	Shao, Zhiyu Shannon,
Description:	1 electronic resource (194 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 76-03, Section: B.
Contained By:	Dissertations Abstracts International76-03B.
Subject:	Civil engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3583795
ISBN:	9781321192940

Two-dimensional hydrodynamic modeling of two-phase flow for understanding geyser phenomena in urban stormwater system /
Shao, Zhiyu Shannon,

Two-dimensional hydrodynamic modeling of two-phase flow for understanding geyser phenomena in urban stormwater system /Zhiyu Shannon Shao. - 1 electronic resource (194 pages)

Source: Dissertations Abstracts International, Volume: 76-03, Section: B.

During intense rain events a stormwater system can fill rapidly and undergo a transition from open channel flow to pressurized flow. This transition can create large discrete pockets of trapped air in the system. These pockets are pressurized in the horizontal reaches of the system and then are released through vertical vents. In extreme cases, the transition and release of air pockets can create a geyser feature. The current models are inadequate for simulating mixed flows with complicated air-water interactions, such as geysers. Additionally, the simulation of air escaping in the vertical dropshaft is greatly simplified, or completely ignored, in the existing models. In this work a two-phase numerical model solving the Navier-Stokes equations is developed to investigate the key factors that form geysers. A projection method is used to solve the Navier-Stokes Equation. An advanced two-phase flow model, Volume of Fluid (VOF), is implemented in the Navier-Stokes solver to capture and advance the interface. This model has been validated with standard two-phase flow test problems that involve significant interface topology changes, air entrainment and violent free surface motion. The results demonstrate the capability of handling complicated two-phase interactions. The numerical results are compared with experimental data and theoretical solutions. The comparisons consistently show satisfactory performance of the model. The model is applied to a real stormwater system and accurately simulates the pressurization process in a horizontal channel. The two-phase model is applied to simulate air pockets rising and release motion in a vertical riser. The numerical model demonstrates the dominant factors that contribute to geyser formation, including air pocket size, pressurization of main pipe and surcharged state in the vertical riser. It captures the key dynamics of two-phase flow in the vertical riser, consistent with experimental results, suggesting that the code has an excellent potential of extending its use to practical applications.

English

ISBN: 9781321192940Subjects--Topical Terms:

860360
Civil engineering.
Subjects--Index Terms:

Mixed flow

Two-dimensional hydrodynamic modeling of two-phase flow for understanding geyser phenomena in urban stormwater system /
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245 1 0 $a Two-dimensional hydrodynamic modeling of two-phase flow for understanding geyser phenomena in urban stormwater system / $c Zhiyu Shannon Shao.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2013
300 $a 1 electronic resource (194 pages)
336 $a text $b txt $2 rdacontent
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500 $a Source: Dissertations Abstracts International, Volume: 76-03, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisors: Yost, Scott A.
502 $b Ph.D. $c University of Kentucky $d 2013.
520 $a During intense rain events a stormwater system can fill rapidly and undergo a transition from open channel flow to pressurized flow. This transition can create large discrete pockets of trapped air in the system. These pockets are pressurized in the horizontal reaches of the system and then are released through vertical vents. In extreme cases, the transition and release of air pockets can create a geyser feature. The current models are inadequate for simulating mixed flows with complicated air-water interactions, such as geysers. Additionally, the simulation of air escaping in the vertical dropshaft is greatly simplified, or completely ignored, in the existing models. In this work a two-phase numerical model solving the Navier-Stokes equations is developed to investigate the key factors that form geysers. A projection method is used to solve the Navier-Stokes Equation. An advanced two-phase flow model, Volume of Fluid (VOF), is implemented in the Navier-Stokes solver to capture and advance the interface. This model has been validated with standard two-phase flow test problems that involve significant interface topology changes, air entrainment and violent free surface motion. The results demonstrate the capability of handling complicated two-phase interactions. The numerical results are compared with experimental data and theoretical solutions. The comparisons consistently show satisfactory performance of the model. The model is applied to a real stormwater system and accurately simulates the pressurization process in a horizontal channel. The two-phase model is applied to simulate air pockets rising and release motion in a vertical riser. The numerical model demonstrates the dominant factors that contribute to geyser formation, including air pocket size, pressurization of main pipe and surcharged state in the vertical riser. It captures the key dynamics of two-phase flow in the vertical riser, consistent with experimental results, suggesting that the code has an excellent potential of extending its use to practical applications.
546 $a English
590 $a School code: 0102
650 4 $a Civil engineering. $3 860360
650 4 $a Water Resource Management. $3 1669219
650 4 $a Applied mathematics. $3 2122814
650 4 $a Water resources management. $3 794747
653 $a Mixed flow
653 $a Multi-phase flow
653 $a Navier-Stokes equation
653 $a Projection methods
653 $a Volume of Fluid method
690 $a 0364
690 $a 0543
690 $a 0595
710 2 $a University of Kentucky. $e degree granting institution. $3 3759194
720 1 $a Yost, Scott A. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 76-03B.
790 $a 0102
791 $a Ph.D.
792 $a 2013
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3583795