Show simple item record

dc.contributor.authorTan, Zhen
dc.contributor.authorGao, H. Oliver
dc.date.accessioned2020-04-03T16:01:34Z
dc.date.available2020-04-03T16:01:34Z
dc.date.issued2019-03-10
dc.identifier.urihttps://hdl.handle.net/1813/69719
dc.descriptionFinal Reporten_US
dc.description.abstractModern urban vehicular tunnels generally have a branched structure and complex nonlinear aerodynamics. We established and analyzed the 1-D aerodynamic equations and pollutant dispersion model in such bifurcate hydraulic networks. To design a tractable model that captures system complexity, we proposed a novel piecewise-affine (PWA) approximation for the flow-dependent local pressure-loss coefficients at tunnel junctions. This enables us to model the flow system via first-order ordinary differential equations (ODEs) with piecewise-quadratic polynomials. We proved a fundamental and easily verifiable sufficient condition for the uniqueness and stability of the steady-state solution of each ODE piece. We also demonstrated via a numerical study that for the entire system (across different ODE pieces) there may exist multiple stable steady-state solutions, which can lead to different CO concentration distributions in the system. Our study provides a systematic modeling tool and a theoretical foundation for air quality management in complex tunnels.en_US
dc.description.sponsorshipU.S. Department of Transportation 69A3551747119en_US
dc.language.isoen_USen_US
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectcomplex urban tunnelsen_US
dc.subjectair quality managementen_US
dc.subjectventilationen_US
dc.subjectnonlinear systemen_US
dc.subjectstabilityen_US
dc.titleAerodynamic Equilibrium and Stability in Ventilation and Air Quality Control of Complex Urban Tunnelsen_US
dc.title.alternativeAerodynamic Equilibrium and Stability for Air Quality Management in Complex Urban Tunnelsen_US
dc.typereporten_US
schema.accessibilityFeaturealternativeTexten_US
schema.accessibilityFeaturecaptionsen_US
schema.accessibilityFeaturereadingOrderen_US
schema.accessibilityFeaturetaggedPDFen_US
schema.accessibilityHazardunknownen_US


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record

Except where otherwise noted, this item's license is described as Attribution 4.0 International

Statistics