2025 Volume 81 Issue 16 Article ID: 24-16195
This study proposed a method to instantly assess the spatial distribution of detailed turbulence statistics within an urban district by referring to an urban turbulence database calculated from LES simulation. The turbulence statistics within an urban district are generally determined by the urban geometry and the main wind direction of the mean flow. Based on this characteristic, LES calculations were performed for each of 16 representative wind directions, and a database of the spatial distribution of turbulence statistics in urban areas was created. The database is referred to in accordance with meteorological information from a wide-area meteorological station, and the representative velocity is scaled to enable instantaneous diagnosis of turbulence statistics within a urban district. The output diagnostic value of the mean wind speed has a linear relationship with the observed value, confirming that the mean flow within an urban district is generally determined only by the urban geometry and the main wind direction, thus demonstrating the validity of the method. On the other hand, when the accuracy of the representative wind speed values in the estimated area is insufficient, there is a difference between the diagnosed value and the observed value.
