室内气流分布的大涡模拟

Large eddy simulation of indoor air distribution

准确地模拟室内气流分布对优化室内通风设计及预测舒适和健康的室内环境有着重要的意义。传统的室内气流分布的数值模拟大都采用k ε两方程湍流模型 ,该方法求解出的是流动变量的平均值 ,无法给出流场结构的详细信息 ,体现不出湍流流动的瞬时性的特点。本文采用大涡模拟 (LES)法求解室内气流分布 ,使用HSMAC法保证计算的稳定性和收敛性。通过对室内等温贴附射流和非等温受限射流两种类型的射流作用下的室内气流分布计算 ,以及导入k ε两方程湍流模型对计算结果进行比较与分析表明 。

Accurate prediction of the indoor air distribution is very important for optimizing ventilating design and predicting a comfortable and healthy indoor environment. The numerical simulations of indoor air distribution usually use the turbulence model method, but this method results in mean value of the flows variable, and can't provide detailed information on the structure of flows field. This paper use a Large Eddy Simulation (LES) for predicting indoor air distribution and a HSMAC method for ensuring computational stability and computational convergence. The comparison and analysis between the results of LES and turbulence model in two types flows including isothermal and nonisothermal flows show that the LES is available to predictive the indoor air distribution.