基于动态条件的室内污染物扩散模拟仿真研究

发布时间：2018-05-24 15:54

本文选题：室内空间 + 概念模型　；参考：《南京师范大学》2015年硕士论文

【摘要】：室内空间是现代人工作生活的重要场所,室内空气质量问题已得到广泛关注。污染物数值模拟是研究室内空气质量的重要技术方法,已经成为研究室内污染物运移扩散机制的有效手段,但目前对室内污染物的模拟仍然存在一些不足,在室内空间模型描述方面,无法高效地提取模拟空间的几何信息、空间结构信息和属性信息；在模拟过程中,模型的边界条件一成不变,无法实现动态条件下的模型模拟；在模拟数据可视化表达方面,无法很好地将模拟结果形象直观的展现出来。本文针对上述的室内污染物数值模拟过程中存在的问题,开展了基于动态条件的室内污染物扩散模拟仿真研究,取得的成果如下：(1)针对室内尺度的空气质量模拟需求,构建室内空间几何特征、结构特征与属性信息耦合的模型模拟概念模型。借鉴CityGML空间模型与建筑物模型的思想,描述概念模型的几何信息、空间结构信息,通过建立属性信息映射机制,将室内空间属性信息与模型边界条件相关联,并给出概念模型属性数据的组织方式。(2)在模型模拟过程中,针对边界条件的改变,结合室内空间概念模型与模拟参数映射方案,实现基于动态条件的污染物扩散模拟。以概念模型构建的三维空间为模型模拟求解空间,设计实现了规则六面体网格的空间离散与模型模拟数据组织,基于计算流体力学(CFD)类库OpenFOAM设定模型模拟数值化方案与求解控制方案,并结合PISO算法构建自定义模型求解器,实现边界条件动态变化的污染物模型模拟。(3)针对模型模拟可视化与模拟数据综合分析的需求,构建室内空间仿真模拟系统,实现污染物的动态仿真模拟。以三维建筑物室内污染物模型模拟过程数据与结果数据为数据源,采用体绘制技术,实现污染物浓度场的可视化表达,并将污染物迁移扩散机理模型与GIS集成,构建仿真模拟系统,实现室内污染物扩散的仿真模拟,充分发挥GIS应用分析与空间数据场可视化的优势。
[Abstract]:Indoor space is an important place for modern people's work and life. The problem of indoor air quality has been widely concerned. The numerical simulation of pollutants is an important technical method to study indoor air quality. It has become an effective means to study the transport and diffusion mechanism of indoor pollutants. However, there are still some shortcomings in the simulation of indoor pollutants. In the description of the interior space model, the geometric information of the simulated space, the spatial structure information and the attribute information can not be efficiently extracted. In the process of simulation, the boundary condition of the model is unchangeable, and the model simulation can not be realized under the dynamic condition. In view of the problems existing in the numerical simulation of indoor pollutants, the simulation research of indoor pollutant diffusion based on dynamic conditions is carried out. The achievements are as follows: (1) the model of indoor space geometric features and the coupling of structural features and attribute information is constructed for indoor air quality simulation requirements. With the idea of CityGML space model and building model, we describe the geometric information of the conceptual model and the spatial structure information. By establishing the attribute information mapping mechanism, the interior spatial attribute information is associated with the model boundary conditions, and the organization mode of the conceptual model is given. (2) in the model simulation process, In view of the change of boundary conditions, the simulation of pollutant diffusion based on dynamic conditions is realized by combining the interior space concept model and the simulation parameter mapping scheme. The three-dimensional space of the conceptual model is simulated to solve the space, and the spatial dispersion and model simulation data organization of the regular hexahedral grid are designed and realized, based on the calculation of the fluid force. CFD class library OpenFOAM set model simulation numerical scheme and solution control scheme, and build a custom model solver with PISO algorithm to realize the pollutant model simulation of dynamic change of boundary conditions. (3) in view of the requirement of model simulation visualization and simulation data comprehensive analysis, the indoor space simulation system is constructed to realize pollution. The dynamic simulation of the object is used to simulate the process data and the result data of the three-dimensional building indoor pollutant model, and the volume rendering technology is used to realize the visualization of the pollutant concentration field. The simulation system is built to simulate the indoor pollutant diffusion, and the simulation simulation system of indoor pollutant diffusion is realized. We should give full play to the advantages of GIS application analysis and spatial data field visualization.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X51

【参考文献】