FLUENT数值模拟室内污染物扩散组分边界条件探究
曹亚平
（山西能源学院，山西 晋中 030600）
摘要： 基于FLUENT15.0 应用质量入口（mass flow inlet） 作为组分边界条件，对室内甲醛扩散的浓度分布进行数值模
拟，探究质量入口边界参数质量流量、组分质量分数、湍流指定方式对浓度数值结果的影响。结果表明：质量流量的不
同会导致数值结果的差异，其参数值的设定对数值结果的准确性有直接影响；组分质量分数数量级增大，计算所得甲醛
浓度则增大为同等数量级，对室内甲醛浓度的分布起决定性作用；质量入口湍流指定方式也会导致数值结果不同。因
此，组分边界条件参数的正确、合理设置，是室内污染物扩散数值模拟极为关键的一个环节。
关键词： 甲醛；扩散；数值模拟；组分边界条件
中图分类号： X51     文献标识码： A     文章编号： 2095-0802-(2021)10-0104-02
Research on Component Boundary Conditions in FLUENT Numerical Simulation of Indoor
Pollutant Diffusion
CAO Yaping
(Shanxi Institute of Energy, Jinzhong 030600, Shanxi, China)
Abstract: This paper carried out the numerical simulation of indoor formaldehyde diffusion concentration distribution based on
FLUENT15.0 and mass flow inlet as component boundary condition, investigated the influences of mass inlet boundary parameters
such as mass flow rate, mass fraction of components and turbulence assignment mode on the numerical results of concentration.
The results show that the difference of mass flow rate will lead to the difference of numerical results, and the setting of parameters
has a direct effect on the accuracy of numerical results; when the order of magnitude of component mass fraction increases, the
calculated formaldehyde concentration increases to the same order of magnitude, which plays a decisive role in the indoor
formaldehyde concentration distribution; the specified mode of mass inlet turbulence will also lead to different numerical results.
Therefore, the correct and reasonable setting of parameters of component boundary conditions is a very important link in the
numerical simulation of indoor pollutant diffusion.

Key words: formaldehyde; diffusion; numerical simulation; component boundary condition