Abstract
Validation of the geometric data such as 3D city model is quite crucial for simulation tasks, since the simulation process strongly correlates to the quality of geometric data being meshed. Validation methodology and healing of the 3D city models using different tools are presented. The most common inherited geometrical errors are checked and analyzed. Accordingly, an appropriate healing process to the case study is performed, which illustrates that the required closed solids and closed shells are obtained within the geometrical structures of the 3D city model being processed. Also, in this paper we compare some related open source and commercial software tools for the validation and healing process. It is noticed that they differ from each other in performing the required healing process. Some of them are quite good in healing specific errors, whereas not successful in healing the rest of errors. The goal of the paper is to obtain more understanding of the geometric validation and healing capabilities of various software tools, and the qualities of generated meshes, to lead to more effective and reliable simulations in the field of urban wind flow simulation.
Highlights
Geometric quality of 3D city models is crucial for data analysis and simulation tasks, which are part of modern applications of the data [3]
The NetFabb does not support GML files, it is one of the most recommended software tool to handle a large amount of errors effectively, and in some cases, the cleaned geometry can get directly compatible with the ICEM-Computational fluid Dynamics (CFD)
We conclude that the process of repairing 3D-Buildings by using ICEM-CFD is time consuming, mainly because of the large size of complex geometrical data
Summary
Geometric quality of 3D city models is crucial for data analysis and simulation tasks, which are part of modern applications of the data (e.g. potential heating energy consumption of city quarters, solar potential, etc.) [3]. A LoD2 building model often contains different types of geometric errors such as gaps in a surface, intersection between surfaces, non-manifold situations and degenerated edge and surface primitives are present, which violates the criteria of a valid LoD2 building geometry. These flawed geometric models eventually lead to serious errors or crashing of the downstream application. The main purpose of this paper is to identify an appropriate strategy to handle 3DCity models so as to be used later effectively and compatible with the ANSYS ICEM-CFD [10] (hereafter referred to as ICEM-CFD), in which the required mesh can be generated correctly, and, the simulation of the related investigation to the urban area such as wind investigation can be performed adequately
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