| While the acceleration of urbanization and the rapid development of industry have brought convenience to people’s daily life,it has also caused a series of environmental problems.Among them,air pollution represented by atmospheric particulate matter such as PM2.5 has become a hot spot of general concern in today’s society.problem.Residential areas are an important part of urban space.The air quality in residential areas directly affects the quality of life of residents.According to statistics,it is found that old communities in urban residential areas account for the vast majority,and there are common problems such as damage to the community environment and poor air quality.Therefore,this article aims to start from the perspective of landscape greening,with the goal of optimizing the human settlement environment,taking the three types of enclosed old communities in Shenyang as the research object,with the help of CFD simulation technology,to optimize the simulation research on the plant space layout of the old communities.The research ideas are as follows:Firstly,through field reconnaissance and satellite maps,the Shenyang enclosed old community was investigated,and the morphological characteristics of Shenyang enclosed old community were analyzed in terms of density,courtyard characteristics,site distribution,and greening layout,and three types of enclosed old communities were extracted.The old community is the research object of actual measurement and simulation.Secondly,the current situation simulation of three types of enclosed old communities is carried out,and the distribution of PM2.5 concentration in the community is analyzed from the horizontal and vertical directions.The results show that: in the horizontal direction,the same community has different spatial locations and spatial layouts.PM2.5 The concentration will be different;in the vertical direction,the PM2.5 concentration distribution characteristics of the three types of plots are all shown as follows: as the height increases,the PM2.5 concentration first increases and then decreases,mainly because of the simulated wind direction and building orientation Vertically related.Finally,by changing the arbor layout and arbor configuration of the community,a variety of optimization plans were set up,and different plans were numerically simulated and the distribution characteristics and concentration of PM2.5 under each plan were analyzed to screen out the best arbor layout and arbor configuration optimization plan.The optimization results of the arbor layout show that for the typical plot I,the best arbor layout plan is: the arbor is planted in the middle of the site and planted in the east-west direction(the arbor species is Styphnolobium japonicum L.),and the arbor is planted on the east and west sides of the site(Populus alba ’Berolinensis’ L.);Community II,the best arbor layout plan is: arbor in the middle of the site and planted in east-west direction(Amygdalus persica f.rubro-plena,Populus alba ’Berolinensis’ L.,and Styphnolobium japonicum L.),arbor in the middle of the field and planted in north-south direction(Amygdalus persica f.rubro-plena,Styphnolobium japonicum L.);in typical community Ⅲ,the best arbor layout plan is: the arbor is planted in the middle of the site and planted in the east-west direction(Populus alba ’Berolinensis’ L.),and the arbor is planted on the east and west sides of the site(Styphnolobium japonicum L.).Arbor configuration optimization results show that the best arbor layout plan is decreasing when the arbor is planted in the middle of the site and east-west;for arbor planting on the east and west sides of the site,the best arbor layout is declining and increasing;When planting on the north and south sides of the arbor site,the best arrangement of arbor is incremental. |
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