Urban Wind Filed Database Based On CFD And WebGIS

The frequent typhoons in the southeastern coastal areas of China have caused huge property losses and casualties,due to the great uncertainty of the typhoon,it is difficult to accurately predict the true situation of the typhoon.Research and establish a wind field database of wind speed ratio base on WebGIS,you can get timely and accurate warning information,defense in advance before the disaster,to facilitate disaster prevention and mitigation work.This paper takes the main area of Shenzhen City as an example,and makes a detail study on the whole process of the rapid modeling method based on GIS,calculation and analyse to establishment of the urban shared wind field database of wind speed ratio and its application.In this paper,the CFD model of the main urban area of Shenzhen is established by the simplified theory and rapid modeling method.The model of building simplification theory and model block calculation is put forward based on the principle of not changing the flow direction of the flow field,the rapid modeling method of establishing urban model is put forward by using GIS building data,the construction model is simplified and modeled by the idea and method;builds up the terrain model of this paper through DEM data downloaded through the Internet;according to the relevant research of the size of the computational domain at home and abroad and the specific situation of this paper,the size of the computational domain model is proposed;establish the computational modelcalculate,finally,complete the work of the whole process from GIS building data to the calculation model.The CFD simulation and analysis of urban multi-directional wind field are carried out.Presents a set of hybrid meshing scheme,and by setting different parameters to compare and analyze,a set of meshing parameters with precision and efficiency is selected;the appropriate turbulence model and wall function are selected,and the inlet wind profile parameters and other calculation parameters are selected;finally,the multi-directional simulation is carried out and the simulation results are analyzed.According to the numerical simulation results based on GIS database visualization and the establishment of WebGIS based wind speed ratio database.The three key technical problems of visualize CFD simulation results in Arc GIS are solved,and the corresponding technical scheme is put forward;according to the proposed technical scheme,the CFD simulation results are displayed by 2D and 3D cloud images;based on the WebGIS and data of numerical simulation results,a practical website of wind speed ratio wind field database can be established,and its application field is expounded in detail.The shared wind field database application website of city can not only be used for rapid warning of typhoon,but also can be applied to urban planning,indoor and outdoor ventilation design,pedestrian wind environment assessment,typhoon risk and typhoon vulnerability analysis and other aspects,it has important practical value.