Ventilation of a Mid-Size City under Stable Boundary Layer Conditions: A Simulation Using the LES Model PALM
City centers have to cope with an increasing amount of air pollution. The supply of fresh air is crucial yet difficult to ensure, especially under stable conditions of the atmospheric boundary layer. This case study used the PArallelized Large eddy simulation (LES) Model PALM to investigate the wind...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-03-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/12/3/401 |
| _version_ | 1797540623401615360 |
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| author | Jonathan Lukas Biehl Bastian Paas Otto Klemm |
| author_facet | Jonathan Lukas Biehl Bastian Paas Otto Klemm |
| author_sort | Jonathan Lukas Biehl |
| collection | DOAJ |
| description | City centers have to cope with an increasing amount of air pollution. The supply of fresh air is crucial yet difficult to ensure, especially under stable conditions of the atmospheric boundary layer. This case study used the PArallelized Large eddy simulation (LES) Model PALM to investigate the wind field over an urban lake that had once been built as a designated fresh air corridor for the city center of Münster, northwest, Germany. The model initialization was performed using the main wind direction and stable boundary layer conditions as input. The initial wind and temperature profiles included a weak nocturnal low-level jet. By emitting a passive scalar at one point on top of a bridge, the dispersion of fresh air could be traced over the lake’s surface, within street canyons leading to the city center and within the urban boundary layer above. The concept of city ventilation was confirmed in principle, but the air took a direct route from the shore of the lake to the city center above a former river bed and its adjoining streets rather than through the street canyons. According to the dispersion of the passive scalar, half of the city center was supplied with fresh air originating from the lake. PALM proved to be a useful tool to study fresh air corridors under stable boundary layer conditions. |
| first_indexed | 2024-03-10T13:03:50Z |
| format | Article |
| id | doaj.art-61c53bf0e0a24003aecf7421c9293a3b |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-10T13:03:50Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-61c53bf0e0a24003aecf7421c9293a3b2023-11-21T11:17:46ZengMDPI AGAtmosphere2073-44332021-03-0112340110.3390/atmos12030401Ventilation of a Mid-Size City under Stable Boundary Layer Conditions: A Simulation Using the LES Model PALMJonathan Lukas Biehl0Bastian Paas1Otto Klemm2Climatology Research Group, University of Münster, 48149 Münster, GermanyClimatology Research Group, University of Münster, 48149 Münster, GermanyClimatology Research Group, University of Münster, 48149 Münster, GermanyCity centers have to cope with an increasing amount of air pollution. The supply of fresh air is crucial yet difficult to ensure, especially under stable conditions of the atmospheric boundary layer. This case study used the PArallelized Large eddy simulation (LES) Model PALM to investigate the wind field over an urban lake that had once been built as a designated fresh air corridor for the city center of Münster, northwest, Germany. The model initialization was performed using the main wind direction and stable boundary layer conditions as input. The initial wind and temperature profiles included a weak nocturnal low-level jet. By emitting a passive scalar at one point on top of a bridge, the dispersion of fresh air could be traced over the lake’s surface, within street canyons leading to the city center and within the urban boundary layer above. The concept of city ventilation was confirmed in principle, but the air took a direct route from the shore of the lake to the city center above a former river bed and its adjoining streets rather than through the street canyons. According to the dispersion of the passive scalar, half of the city center was supplied with fresh air originating from the lake. PALM proved to be a useful tool to study fresh air corridors under stable boundary layer conditions.https://www.mdpi.com/2073-4433/12/3/401stable boundary layerlarge eddy simulationurban climatologyfresh air corridorair ventilation assessmentcity planning |
| spellingShingle | Jonathan Lukas Biehl Bastian Paas Otto Klemm Ventilation of a Mid-Size City under Stable Boundary Layer Conditions: A Simulation Using the LES Model PALM Atmosphere stable boundary layer large eddy simulation urban climatology fresh air corridor air ventilation assessment city planning |
| title | Ventilation of a Mid-Size City under Stable Boundary Layer Conditions: A Simulation Using the LES Model PALM |
| title_full | Ventilation of a Mid-Size City under Stable Boundary Layer Conditions: A Simulation Using the LES Model PALM |
| title_fullStr | Ventilation of a Mid-Size City under Stable Boundary Layer Conditions: A Simulation Using the LES Model PALM |
| title_full_unstemmed | Ventilation of a Mid-Size City under Stable Boundary Layer Conditions: A Simulation Using the LES Model PALM |
| title_short | Ventilation of a Mid-Size City under Stable Boundary Layer Conditions: A Simulation Using the LES Model PALM |
| title_sort | ventilation of a mid size city under stable boundary layer conditions a simulation using the les model palm |
| topic | stable boundary layer large eddy simulation urban climatology fresh air corridor air ventilation assessment city planning |
| url | https://www.mdpi.com/2073-4433/12/3/401 |
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