Simulation Study on the Influence of the Urban Street Intersection Greening on Ventilation Performance

Abstract

This article hopes to explore the impact of single-row shrubs, single-row trees, and double-row trees on the ventilation performance of street intersections. By simplifying the shape of intersections, ideal models can be built. Use the model and numerical simulation software FLUENT of the cross street intersection to simulate the airflow and pollutant distribution of the intersection, the wind direction is 0 ° and 45 °. Mainly analyzed the pollutant cloud maps of the three height parts (0.5 m, 1.5 m and 5 m), and compared the average speed, average concentration and maximum concentration of the vertical height intersection area, and studied the streets in different directions of green intersections under different wind directions Impact. According to the simulation results of wind speed and pollutant distribution, find the internal flow field and pollutant diffusion law at the intersection of the intersection, and use the ventilation index to compare the greening layout of the intersection and the intersection, especially the ventilation effect of the pedestrian activity space at the bottom. This article hopes to obtain a greening form based on street intersections that focus on urban ventilation and are beneficial to the diffusion of pollutants.