Abstract
We proposed an extraction method for wind corridor by applying persistent homology (PH) to three-dimensional (3D) flow-field data. The procedure consists of three steps: 1)The wind speed ratio between local wind speed and surrounding averaged wind speed is calculated using two different size of space filters based on the result of 3D computational fluid dynamics (CFD) data. The high ratio regions expected that wind smoothly passes though. 2)Then, the three-dimensional ratio is converted into two-dimensional persistent diagram (PD) to understand the characteristics of the flow field by applying PH. 3) Finally, the long life-time regions in PD are visualized as wind corridors. In addition, we applied the proposed method to a flow field in a water front of Tokyo Metropolitan area calculated with CFD as an example, and compared the visualized wind corridors with these illustrated in an urban planning guidelines by Tokyo Metropolitan office.
