Abstract
Abstract. Virtual reality (VR) technologies are used more and more in product development processes and are upcoming in urban planning systems as well. They help to visualize big amounts of data in self-explanatory way and improve people’s interpretation of results. In this paper we demonstrate the process of visualizing a city model together with wind simulation results in a collaborative VR system. In order to make this kind of visualization possible a considerable amount of preliminary work is necessary: healing and simplification of building models, conversion of these data into an appropriate CAD-format and numerical simulation of wind flow around the buildings. The data obtained from these procedures are visualized in a collaborative VR-System. In our approach CityGML models in the LoD (Level of Detail) 1, 2 and 3 can be used as an input. They are converted into the STEP format, commonly used in CAD for simulation and representation. For this publication we use an exemplary LoD1 model from the district Stöckach-Stuttgart. After preprocessing the model, the results are combined with those of an air flow simulation and afterwards depicted in a VR system with a HTC Vive as well as in a CAVE and a Powerwall. This provides researchers, city planners and technicians with the means to flexibly and interactively exchange simulation results in a virtual environment.
Highlights
The use of Virtual Reality (VR) techniques in product development processes in the automotive and aviation industry, and in urban planning, has increased
In most cases 3D city models still cannot be used in computational fluid dynamics (CFD) simulations, even if they are transferred to a computer-aided design (CAD) format and are without errors
VENTUS, 2019) is used to display the building models and the simulation results in a virtual environment
Summary
The use of Virtual Reality (VR) techniques in product development processes in the automotive and aviation industry, and in urban planning, has increased. The presented project is concerned with the process of visualizing a 3D city model together with wind simulation results in a collaborative VR system This involves the visualization in a VR environment, and the simplification of the necessary preprocessing of virtual buildings for a numerical simulation, as well as the simulation itself. Different applications make different demands on 3D city models Some of them, such as visualization and planning, do not have high demands on the geometry, whereas others, such as numerical simulation methods, have specific requirements on data formats and geometric parameters. In most cases 3D city models still cannot be used in CFD simulations, even if they are transferred to a CAD format and are without errors One reason for this can be short edges or small angles in a building’s geometry, which may lead to an unsatisfactory CFD mesh, resulting in non-converging solutions or unacceptably high computing time. (e.g. STEP for CAD models or CityGML for virtual city models) another focus is to design a cost-effective and data secure solution. (cf. Tag et al, 2018)
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