Research On Indoor Pollutants Simulation Based On The Dynamic Conditions

Indoor is the important place for the people working and living. The indoor air quality is widely concerned. Contaminants numerical simulation, an important technical method for indoor air quality research, has become the effective mean for studying indoor pollutants migration diffusion mechanism. However, at the present, the simulation of indoor pollutants has some deficiencies. In terms of model description for indoor, it lacks of effective methods to extract the geometry information and the attribute description information. In the terms of simulation processing, as the boundary of the model has not changed, it could not achieve the model simulation under dynamic conditions. In the terms of simulation visualization, simulation results cannot be shown well.This thesis aims at the problems which exist in the contaminants numerical simulation has. The research on indoor pollutants diffusion simulation based on the dynamic conditions is presented. Results are as follows:(1) In terms of the requirements for indoor air quality simulation, the conceptual model is built with the space geometry, structure and attribute information. Referencing the thought of CityGML space model and building model, the geometry information of the conceptual model and spatial structure information are described. Through the establishment of the attribute information mapping mechanism, the attribute information is associated with the model boundary conditions and the conceptual model of attribute data organization is given.(2) In the terms of simulation processing, the boundary conditions might be changed. Combined with the indoor space concept model and the simulation parameter mapping scheme, the research on indoor pollution simulation based on the dynamic conditions is achieved. The rules of hexahedral discrete space and the discrete grid description standard are made which is based on 3D space of conceptual modeling. To achieve model simulation based on the dynamic conditions, the boundary conditions and numerical value solutions are made based on CFD library OpenFOAM and custom model is built by PISO equation solver.(3) In the terms of the demand of model simulation visualization and simulation data comprehensive analysis, the indoor pollutants diffusion simulation is achieved. Take the data of indoor pollutants diffusion simulation as the three-dimensional visualization data source. The volume rendering techniques is adopted to realize the 3D visualization in indoor pollutants. By integrating contaminant models with GIS, a simulation system is built, which take the full advantages of the spatial analysis about GIS and 3D visualization.