Research On 3D Scene Modeling Method For Indoor Fire Simulation And Analysis

With the rapid development of social economy and city construction,the buildings' internal structure becomes more complex.When the fire happens,its harm to people's life and property is immeasurable.To solve these problems,a large number of analysis were developed for fire simulation by researchers,among which most of them focused on the analysis of special application.While,the complex structure of the building leads to the low efficiency of the modeling of scene model.So,it is increasingly significant to study on efficient modeling method for fire simulation scene in building.In this paper,we use the Fire Dynamics Simulator as the main research object.Research on the 3D scene model for indoor fire simulation analysis and we achieve rapid modeling using the existing 3D building model to simulate the indoor fire scene,and realize the visualization of the indoor fire scene,So that,the chasm between the GIS and special application model in the field of crowd evacuation in the construction of 3D city can be crossed.In this paper,the research content mainly includes:(1)The 3D data model of fire simulation scene in building for FDS model.With the guidance of Geography,architecture,fire simulation and the other related fields research at home and abroad,building a 3D architecture model for FDS indoor fire analysis.Sorting the FDS entity objects,spatial entity relationship,fire properties and geometry of the scene model.Establishing information model which can complete express the indoor fire scene for the analysis of the fire with semantic,geometry,properties and the concept of relationship.And establish the corresponding logical expressions and physical storage model.(2)The 3D modeling method for the indoor fire scene simulation based on OAM.Based on scene model which used for FDS indoor fire simulation,researching on extraction transformation and construction method for the entity geometry,relation and attribute information based on OAM.Realizing the extraction of irregular entities and rules of geometrical information,derivation of the boundary relation and the perfection of the fire attribute information.Building indoor fire simulation scene,to meet the application requirements of fire analysis.(3)The visual expression for FDS model.Analyzing the simulation results of FDS,researching on the transformation and extraction method based on the VTK geometry,vector scalar value.Combining the FDS and Paraview software,achieving the combination or direct expression for every result.This visualization methods can visually display fire,smoke and heat transfer process which changes with time.The results show that: Based on OAM model and the model for FDS indoor scene,our modelling method greatly save the amount of time and human resources for modelling the FDS fire simulation scene.Our method can effectively achieve the rapid modeling from the architecture model to the fire simulation scene model.This will promote the development of indoor fire simulation,and will also promote the topography and GIS in construction and development of 3D model.