Effect of Double Noise-Barrier on Air Pollution Dispersion around Road, Using CFD
Noise-barriers on both sides of the roadway (hereafter referred to as double noise-barriers), are a common feature along roads in Korea, and these are expected to have important effects on the near-road air pollution dispersion of vehicle emissions. This study evaluated the double noise-barrier impa...
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| Format: | Article |
| Language: | English |
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Springer
2014-06-01
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| Series: | Asian Journal of Atmospheric Environment |
| Subjects: | |
| Online Access: | http://asianjae.org/_common/do.php?a=full&b=11&bidx=1555&aidx=19677 |
| _version_ | 1797706760503427072 |
|---|---|
| author | Sang Jin Jeong |
| author_facet | Sang Jin Jeong |
| author_sort | Sang Jin Jeong |
| collection | DOAJ |
| description | Noise-barriers on both sides of the roadway (hereafter referred to as double noise-barriers), are a common feature along roads in Korea, and these are expected to have important effects on the near-road air pollution dispersion of vehicle emissions. This study evaluated the double noise-barrier impact on near-road air pollution dispersion, using a FLUENT computational fluid dynamics (CFD) model. The realizable k-ε model in FLUENT CFD code was used to simulate vehicle air pollutant dispersion, in around 11 cases of double noise-barriers. The simulated concentration profiles and surface concentrations under no barrier cases were compared with the experimental results. The results of the simulated flows show the following three regimes in this study: isolated roughness (H/W=0.05), wake interface (H/W=0.1), and skimming flow (H/W> 0.15). The results also show that the normalized average concentrations at surface (z=1 m) between the barriers increase with increasing double noisebarrier height; however, normalized average concentrations at the top position between the barriers decrease with increasing barrier height. It was found that the double noise-barrier decreases normalized average concentrations of leeward positions, ranging from 0.8 (H/W=0.1, wake interface) to 0.1 (H/W =0.5, skimming flow) times lower than that of the no barrier case, at 10 x/h downwind position; and ranging from 1.0 (H/W=0.1) to 0.4 (H/W=0.5) times lower than that of the no barrier case, at 60 x/h downwind position. |
| first_indexed | 2024-03-12T05:56:06Z |
| format | Article |
| id | doaj.art-0450f6fe30dd4aaf809534b80cd5a06f |
| institution | Directory Open Access Journal |
| issn | 1976-6912 2287-1160 |
| language | English |
| last_indexed | 2024-03-12T05:56:06Z |
| publishDate | 2014-06-01 |
| publisher | Springer |
| record_format | Article |
| series | Asian Journal of Atmospheric Environment |
| spelling | doaj.art-0450f6fe30dd4aaf809534b80cd5a06f2023-09-03T04:31:31ZengSpringerAsian Journal of Atmospheric Environment1976-69122287-11602014-06-0182818810.5572/ajae.2014.8.2.081Effect of Double Noise-Barrier on Air Pollution Dispersion around Road, Using CFDSang Jin Jeong0Department of Energy and Environmental Engineering, Kyonggi University, Suwon, Gyeonggi-do 442-760, KoreaNoise-barriers on both sides of the roadway (hereafter referred to as double noise-barriers), are a common feature along roads in Korea, and these are expected to have important effects on the near-road air pollution dispersion of vehicle emissions. This study evaluated the double noise-barrier impact on near-road air pollution dispersion, using a FLUENT computational fluid dynamics (CFD) model. The realizable k-ε model in FLUENT CFD code was used to simulate vehicle air pollutant dispersion, in around 11 cases of double noise-barriers. The simulated concentration profiles and surface concentrations under no barrier cases were compared with the experimental results. The results of the simulated flows show the following three regimes in this study: isolated roughness (H/W=0.05), wake interface (H/W=0.1), and skimming flow (H/W> 0.15). The results also show that the normalized average concentrations at surface (z=1 m) between the barriers increase with increasing double noisebarrier height; however, normalized average concentrations at the top position between the barriers decrease with increasing barrier height. It was found that the double noise-barrier decreases normalized average concentrations of leeward positions, ranging from 0.8 (H/W=0.1, wake interface) to 0.1 (H/W =0.5, skimming flow) times lower than that of the no barrier case, at 10 x/h downwind position; and ranging from 1.0 (H/W=0.1) to 0.4 (H/W=0.5) times lower than that of the no barrier case, at 60 x/h downwind position.http://asianjae.org/_common/do.php?a=full&b=11&bidx=1555&aidx=19677cfd modeldouble noise-barriervehicle pollution dispersioninner barrier concentration retentionconcentration dilution behind barrier |
| spellingShingle | Sang Jin Jeong Effect of Double Noise-Barrier on Air Pollution Dispersion around Road, Using CFD Asian Journal of Atmospheric Environment cfd model double noise-barrier vehicle pollution dispersion inner barrier concentration retention concentration dilution behind barrier |
| title | Effect of Double Noise-Barrier on Air Pollution Dispersion around Road, Using CFD |
| title_full | Effect of Double Noise-Barrier on Air Pollution Dispersion around Road, Using CFD |
| title_fullStr | Effect of Double Noise-Barrier on Air Pollution Dispersion around Road, Using CFD |
| title_full_unstemmed | Effect of Double Noise-Barrier on Air Pollution Dispersion around Road, Using CFD |
| title_short | Effect of Double Noise-Barrier on Air Pollution Dispersion around Road, Using CFD |
| title_sort | effect of double noise barrier on air pollution dispersion around road using cfd |
| topic | cfd model double noise-barrier vehicle pollution dispersion inner barrier concentration retention concentration dilution behind barrier |
| url | http://asianjae.org/_common/do.php?a=full&b=11&bidx=1555&aidx=19677 |
| work_keys_str_mv | AT sangjinjeong effectofdoublenoisebarrieronairpollutiondispersionaroundroadusingcfd |