Impact of Wind Direction on Flow Over a Realistic Urban Area: A Large-Eddy Simulation Study
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908589355958272 |
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| author | Rodríguez, Ivette Duró, Josep Maria Mestres, Ernest Teng, Ming Lehmkuhl, Oriol |
| author_facet | Rodríguez, Ivette Duró, Josep Maria Mestres, Ernest Teng, Ming Lehmkuhl, Oriol |
| contents | We conducted high-resolution large-eddy simulations over a real urban district in Barcelona to examine the impact of wind direction on near-ground flow. The computational mesh resolves over 500 million degrees of freedom, with a spatial resolution on the order of 1 m at pedestrian level. This allows a detailed analysis of mean velocity and turbulence patterns within the canopy layer. Although instantaneous flow fields differ significantly between cases, double-averaged profiles of velocity and turbulence intensity remain remarkably consistent across all wind directions. The results reveal a shear-driven mixing layer below the average building height and turbulence maxima near the tallest buildings, highlighting the influence of urban morphology on the development of flow and turbulence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_11247 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Impact of Wind Direction on Flow Over a Realistic Urban Area: A Large-Eddy Simulation Study Rodríguez, Ivette Duró, Josep Maria Mestres, Ernest Teng, Ming Lehmkuhl, Oriol Fluid Dynamics We conducted high-resolution large-eddy simulations over a real urban district in Barcelona to examine the impact of wind direction on near-ground flow. The computational mesh resolves over 500 million degrees of freedom, with a spatial resolution on the order of 1 m at pedestrian level. This allows a detailed analysis of mean velocity and turbulence patterns within the canopy layer. Although instantaneous flow fields differ significantly between cases, double-averaged profiles of velocity and turbulence intensity remain remarkably consistent across all wind directions. The results reveal a shear-driven mixing layer below the average building height and turbulence maxima near the tallest buildings, highlighting the influence of urban morphology on the development of flow and turbulence. |
| title | Impact of Wind Direction on Flow Over a Realistic Urban Area: A Large-Eddy Simulation Study |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2510.11247 |