Aerodynamic Equilibrium and Stability in Ventilation and Air Quality Control of Complex Urban Tunnels
| dc.contributor.author | Tan, Zhen | |
| dc.contributor.author | Gao, H. Oliver | |
| dc.date.accessioned | 2020-04-03T16:01:34Z | |
| dc.date.available | 2020-04-03T16:01:34Z | |
| dc.date.issued | 2019-03-10 | |
| dc.description | Final Report | en_US |
| dc.description.abstract | Modern 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.sponsorship | U.S. Department of Transportation 69A3551747119 | en_US |
| dc.identifier.uri | https://hdl.handle.net/1813/69719 | |
| dc.language.iso | en_US | en_US |
| dc.rights | Attribution 4.0 International | * |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | * |
| dc.subject | complex urban tunnels | en_US |
| dc.subject | air quality management | en_US |
| dc.subject | ventilation | en_US |
| dc.subject | nonlinear system | en_US |
| dc.subject | stability | en_US |
| dc.title | Aerodynamic Equilibrium and Stability in Ventilation and Air Quality Control of Complex Urban Tunnels | en_US |
| dc.title.alternative | Aerodynamic Equilibrium and Stability for Air Quality Management in Complex Urban Tunnels | en_US |
| dc.type | report | en_US |
| schema.accessibilityFeature | alternativeText | en_US |
| schema.accessibilityFeature | captions | en_US |
| schema.accessibilityFeature | readingOrder | en_US |
| schema.accessibilityFeature | taggedPDF | en_US |
| schema.accessibilityHazard | unknown | en_US |
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