A Visual Interaction Method for Ventilation Environment Coupled with BIM-CFD and Virtual Reality

The traditional analysis results based on computational fluid dynamics (CFC) are presented in two- dimensional cloud maps, which makes the calculation process cumbersome and difficult for users to understand. With the development of virtual reality (VR) technology, new ideas have been provided for wind environment visualization. Currently, most of the coupling from CFD to VR visualization requires post- processing software such as Paraview, Autodesk 3DMax, Unity 3D, etc. for rendering or intermediate format conversion. This process is not only time-consuming, but also prone to data loss during model transformation, which affects the timely analysis and feedback of design results. This article combines Building Information Modeling (BIM) technology, establishes a parameterized 3D model, proposes a model lightweight processing method based on the three-dimensional grid method, and develops the FBX Export lightweight plugin to convert CFD simulation results into FBX format that can be integrated on the VR platform, simplifying the immersive visualization method of CFD results. Then, by improving the Lagrangian algorithm, the geometric model and CFD calculation results are visualized and displayed in the model rendering software. This process eliminates the need for CFD post-processing middleware, avoids unnecessary data exchange and software incompatibility issues, improves the quality of virtual visualization and environment rendering, and helps designers analyze ventilation environments in virtual 3D environments.