Towards an open-access dataset of the flow over realistic urban geometries: high-fidelity simulations and validation

This work presents the development of a high-resolution, open-access dataset of urban airflow over a realistic district in Barcelona, based on large-eddy simulations (LES) performed for 16 different wind directions. The simulations are conducted over a highly detailed computational domain that faithfully reproduces the real urban geometry, using grids of approximately 500 million points. The LES methodology has been rigorously benchmarked against wind tunnel data from comparable urban configurations, ensuring confidence in the simulation fidelity. For each wind condition, the dataset provides time-averaged velocity fields, turbulence statistics, and 1,000 instantaneous two-dimensional flow snapshots at pedestrian level (2 m). The dataset is structured for seamless integration with open-source tools, enabling flexible access and analysis. This resource aims to support the validation of RANS-based urban flow models, the creation of reduced-order models (ROMs), and the development of AI-based surrogates, while offering a robust foundation for studies on urban microclimate, pollutant dispersion, and pedestrian-level wind comfort. The dataset will be publicly available via the Cora repository: <a href="https://cora.csuc.cat/es/">https://cora.csuc.cat/es/</a>