This report summarizes a series of processes in which three-dimensional (3D) point cloud data representing the shape of topography and buildings, etc. are turned into 3D models, and 3D CFD mesh are created based on these 3D models. In the conventional method, the topography is modeled based on publicly available information from the Geospatial Information Authority of Japan and other sources, while modeling of buildings and other structures is manually done using information such as technical drawings. On the other hand, the method developed by Mitsubishi Heavy Industries, Ltd. automatically creates models from 3D point cloud data, thereby considerably reducing the time consumed. For evaluation targets for which this data is available, detailed disaster simulation in which buildings and other structures are included can be easily performed. Our method is expected to facilitate the use of disaster simulation on occasions when precautionary measures against disasters are discussed for factories, plants, urban areas, etc., where structures such as buildings can have a considerable influence on the disaster risk.
