Research On Optimal Design Of Street Outline Form From The View Of Promoting River Wind Penetration

Previous studies have shown that urban water bodies have a great impact on the climate micro-climate of Riverside blocks,which has made the planning and design of riverside blocks increasingly important.The main streets in the riverside block,as an important part of the urban ventilation corridor,can significantly improve the air flow capacity within the block,and also carry the major effect of guiding the cool and fresh air above the river surface into the riverside block to alleviate the heat island effect.The change in the shape of the street's outline will directly affect the role of the street as a secondary ventilation corridor in the city.Therefore,it is of great significance to study the influence of different street contour shapes on the penetration ability of river wind into the street,and promote the effective utilization of river wind,a precious natural coolant,to improve the thermal environment of the block.Based on the relevant theory of parametric design,this paper selects genetic algorithm as the support of evolutionary algorithm,connects the commonly used CFD simulation software and modeling software under the operating framework of Isight software,and builds a set of effective river wind environment simulation optimized design platform that based on genetic algorithm.And the optimization design of the contour shape of the riverside street was made when the river wind transmittance,which represents the ability of water vapor diffusion level in the air,reaches the maximum,as the optimization goal.In the early stage of optimization design,a typical street located in the riverside block,Wuhan City,Hubei Province was selected for actual measurement.Then use CFD simulation software to simulate the street's river wind environment,and verify the feasibility and reliability of using this simulation method by comparing and analyzing the measured and simulated results.Finally,in order to save the optimization cost,the orthogonal design is used to screen the relevant design parameters,and then focus on the design parameters that have a higher impact on the optimization target,and carry out the optimization design of the contour shape of the riverside street aimed at improving the penetration capacity of the river wind.According to the optimized design results,the street outline forms with greater river wind penetration capacity are sorted out,and the corresponding design variables and the values of the street contour form quantitative indicators are extracted.Common characteristics,to a certain extent,put forward the design plan and strategy of the street space of the street in the riverside block.The integration of excellent solution sets not only obtains the optimal solution,but also the common value range of inclusive design-related variables and morphological indicators.In the actual design and application,the street outline form with greater tolerance and the ability to ensure the greater penetration of the street river wind has more reference and operable space.