Numerical study on the influence of human walking on contaminant transport indoors by using momentum theory method

6th Annual International Conference on Material Science and Engineering

Cen, Dongdong^1 ; Feng, Zhuangbo^1 ; Cao, Shi-Jie^1

Department of Civil and Environmental Engineering, Soochow University, Suzhou

215131, China^1

关键词: Calculation time;    Contaminant transport;    Dynamic mesh method;    Human activities;    Momentum theory;    Particle concentrations;    Particle dispersion;    User-defined functions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/397/1/012079/pdf
DOI  :  10.1088/1757-899X/397/1/012079

来源: IOP

【 摘 要 】

Particle dispersion induced by human activities is important to human health especially in operation room and nursery. The application of dynamic mesh method in objects moving simulation has aroused considerable interests in recent years, which wasnot CPU-friendly. In this paper, we proposed a new momentum theory methodfor reducing calculation time. In this method, user defined function (UDF) was usedfor simulatinginteraction force between human body and air. RNG k- model was applied in turbulencesimulation. In present paper, dynamic mesh method and momentum theorymethod were utilizedto investigate the airflow flow field during human walking. The simulated air velocity results by these two methods agreed well. The influence of body walking on decay of particle concentration was alsoinvestigated. The results showed that decay rate decreasedin presence ofobjects moving. The concentration of particle decreased to 10% in fifteen minutes in body walking process.