<p>A three-dimensional computational fluid dynamics (CFD) model
has been developed to simulate the distribution of automobile emissions on and
near a highway. A variety of k-ε turbulence models were adopted to simulate the
turbulence flow, and a non-reaction species model was coupled to simulate the dispersion
of emissions. The models were first validated by comparing velocity profiles and
normalized emission concentration with wind tunnel experiments, and good
agreement was observed. Next, further simulation and analysis revealed that
T-shaped noise barriers could reduce more emissions concentration in downstream
areas than rectangular noise barriers; however, the noise barrier shape effects
on the dispersion of emissions were also influenced by inflow conditions.
Thirdly, the traffic flow conditions on the highway made a difference to the
dispersion of emissions. Automobile wakes not only existed behind vehicles but
also induced turbulence on adjacent lanes, causing more emissions on the
highway. Low traffic speed, such as congestion, would result in more emissions
remaining on the highway as well. At last, vehicle body shapes modified the
flow patterns by their slant angles and heights. Vehicles with slant angles on
both front and rear sides had the least concentration of emissions at the
center of the highway.</p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/12252275 |
| Date | 06 May 2020 |
| Creators | Shaoguang Wang (8802878) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/MODELING_AND_ANALYSIS_OF_HIGHWAY_EMISSIONS_DISPERSION_DUE_TO_NOISE_BARRIER_SHAPE_EFFECTS_AND_TRAFFIC_FLOW_UNDER_DIFFERENT_INFLOW_CONDITIONS/12252275 |
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