Research On Indoor Air Flow Simulation Based On The3D Building Model Of CityGML

With the development of smart cities,3D building model put forward higher requirements, while the current main building model like VRML/X3D, KML, BIM/IFC, CityGML, can not not support the spatial indoor model analysis.In addition to, With the high requirement of indoor air environment,more and more people focus on the indoor air qulity which is mainly affected by the flow distribution of the indoor air. But3D GIS spatial analysis is lack of the simulations of indoor air flow.To further enhance the ability to3D GIS analysis of indoor model, expand the application of3D GIS analysis and promote the development of smart cities, this paper launches a3D building of indoor air flow simulation. Demand for promoting the ability of model analysis of interior3D buildings and extending3D GIS spatial analysis,on the based of the conceptual model of indoor air flow simulation, the paper reasearches the method of solving to the indoor air simulation model,and gets the following achievements.(1) The paper analysises the semantic-geometric model of building thematic model described by CityGML standerd, and proposes the concept of conceptual model of indoor air flow and it’s data structure by imitating the dictionary dtructure of CityGML,then, implements the method of constructing the conceptual model. The case proofs that the the conceptual model of indoor air flow simulation meets the demand of constructing the element of indoor3D objects.(2) Based on the standerd k-epsilon model of indoor air flow and it’s discreted format for the3D unsteady problem, combined the PISO algorithm, this paper constructs custom solver to the mathematical model of indoor air flow, then, discretes the3D simulation space constrcted by the conceptual model of indoor air flow by Mapping,and describes the scheme of linear of equations discrete and the scheme of solution controls,finally,gets the solution of the state of indoor air flows,being accurate resulet and meeting the demands of extending the analysis function of3D GIS.