污染源对建筑小区影响的数值模拟

采用二维RNG k-ε湍流模型,通过模拟不同位置污染源和建筑物不同规划位置,研究了单栋建筑物和双排多建筑物情况下,污染源对建筑物或建筑群的影响,得到了相应的污染物浓度分布.研究发现:污染物的迁移扩散是由建筑物周围的风速场及湍流扩散系数分布确定的,并且污染物在建筑群中的浓度分布与建筑群中各建筑物的分布位置密切相关.在考虑当地主要气象条件下,通过合理安排建筑群中各建筑物的位置,可以有效地减少建筑群内污染物高浓度的影响区域,避免污染物积聚死角.同时,优化污染源的位置也可以达到减少建筑群内污染物高浓度的影响区域.将污染源放置在高速风道上,其污染范围小,利于污染物迁离小区;反之,污染范围大,不利于污染物迁离. 

Numerical Simulation on Influence of Polluting Sources on the Building Group

A two-dimensional numerical model based on renormalization group(RNG) k-ε turbulence model was adopted to simulate the influence of polluting sources on the buildings or building group,under single building and three parallel buildings column configurations.Various building configurations and different source positions were simulated,and the pollutant concentration distribution is obtained.It is found out that the pollutant transport and diffusion is determined by the wind speed and local turbulent diffusivity,and the pollutant concentration around buildings is strongly dependent on the position of the pollutant sources and all the buildings.By considering local meteorological conditions and reasonably arranging the position of buildings,the high-concentration area and the dead corner of pollutant can be reduced efficiently.On the other hand,the affected area of high concentration can also be decreased by optimizing the position of polluting sources.By setting the source at the high-speed wind duct, the affected area can be small and the pollutant leaves the building group easily.On the contrary,the affected area is large and the pollutant leaves the building group hardly.