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Development of an Accurate Urban Modeling System Using CAD/GIS Data for Atmosphere Environmental Simulation

Tsinghua Science and Technology 2008年第S1期13卷 412-417页

作者： tomosato takada Kazuo Kashiyama Department of Civil Engineering Chuo University

This paper presents an urban modeling system using CAD/GIS data for atmosphere environmental simulation, such as wind flow and contaminant spread in urban area. The CAD data is used for the shape modeling for the high-storied buildings and civil structures with complicated shape since the data for that is not included in the 3D-GIS data accurately. The unstructured mesh based on the tetrahedron element is employed in order to express the urban structures with complicated shape accurately. It is difficult to understand the quality of shape model and mesh by the conventional visualization technique. In this paper, the stereoscopic visualization using virtual reality (VR) technology is employed for the verification of the quality of shape model and mesh. The present system is applied to the atmosphere environmental simulation in urban area and is shown to be an useful planning and design tool to investigate the atmosphere environmental problem.

关键词： CAD/GIS urban modeling mesh generation atmosphere environmental simulation stereo-scopic visualization virtual reality

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Large Scale Finite Element Modeling,Simulation and Visualization for Wind Flows in Urban Area Using Virtual Reality

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Tsinghua Science and Technology 2008年第S1期13卷 84-89页

作者： Kazuo Kashiyama tomosato takada Hideo Miyachi Department of Civil Engineering Chuo University Visualization Development Division KGT Inc.

A large-scale finite element modeling, simulation and visualization for wind flows are presented. The modeling method using GIS/CAD data is employed. The stabilized parallel finite element method based on SUPG/PSPG method is employed for the analysis of wind flows. The present method is applied to the simulation of wind flow and contaminant spread in urban area. The visualization based on virtual reality is employed to evaluate the mesh quality and computational results. The computed results are qualitatively in agreement with the experimental results and actual phenomena. The present method is shown to be a useful tool to simulate the wind flows in urban area.

关键词： virtual reality CAD/GIS urban area wind flows

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