大空间建筑物室内气流的大涡模拟

利用大涡模式对大空间建筑物室内气流进行模拟研究,并取得了良好的效果。模拟的内容包括:(1)在机械通风情况下,当存储货物的仓库发生火灾时,将会改变室内的温度场和流场的分布;(2)在自然通风情况下,简单方形钝体建筑物以及大型体育馆室内的流场状况。对以上模拟结果的分析表明,发生火灾时,室内流场主要是由热力作用支配,通风口的位置、通风气流的热力性质、室内物品的堆放方式以及室内物品的热力属性都会在很大程度上影响室内的流场和温度场。在自然通风情况下,室外的气流状况和通风口的位置对室内的气流都有很大的影响,室外的风速大小和风向分别对室内风速的大小和流场分布有重要影响,而通风口的位置主要影响室内气流分布状况。由于决定室内气流的因素很多,所以像体育馆这种对室内气流和空气质量要求比较高的建筑物,要评价以及设计其通风效果及室内空气品质必须针对具体情况从多个方面作具体分析。

Large Eddy Simulation of Airflow inside a Large Space Buildings

The large eddy modle is used to simulate the indoor airflow inside a large space buildings,and some good effects are obtained.The simulation contents include:(1) the indoor temperature and flow fields when fire takes place in the warehouse under the condition of mechanical ventilation;(2) the indoor airflow in simple square building and gymnasium under the condition of natural ventilation.Through analyzing the above results,we find that: When the building catches fire,the indoor flow is dominated by the thermodynamic effect.The position of the air-vents,the thermodynamic property of the ventilated airflow,the position and the thermodynamic property of indoor goods would significantly affect the airflow and temperature fields;under the condition of natural ventilation,the outdoor weather condition and the position of the air-vents have large influence on the indoor airflow,the outdoor wind velocity and wind direction have important influence on the indoor wind velocity and the distribution of the indoor airflow field,but the position of the air-vent mainly affects the distribution of the indoor airflow field.Because there are lots of factors influencing the indoor airflow,it must be analyzed in details to evaluate and design indoor airflow for the building like gymnasium,in which the requests for indoor airflow and indoor air quality are very strict.