CFD Analysis on Greenspace-Released Oxygen Dispersion under Urban Wind Speed Field in Summer

摘要

With the increasing destruction of the ecological environment, the strategic position and role of ecological green space is ever more conspicuous in the sustainable development. In this paper, a three-dimensional computational fluid dynamics (CFD) simulation was carried out to analyze the oxygen dispersion in horizontal and vertical space under urban wind speed field conditions in city central of Liaoyang, China. It will reveal oxygen dispersion regularity and provide new ideas for urban green space system planning. In the process of simulation, redistricting the building on the basis of density and volume rate, so as to simulate the influences of building space on the wind speed and oxygen dispersion accurately. The urban wind speed and direction will change with the ground height change constantly, we try to take comprehensive consideration into the relationships of building, wind field, ground height and further analysis the three-dimensional ecological space of oxygen dispersion. The temporal variations of wind speed and oxygen dispersion were analyzed at the pedestrian level (1.5m above the ground level).