Mostafa Rahimi - Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
Farhad Sadegh Moghanlou - Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
Khadijeh Samandari - Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

Predicting the air flow pattern with proper accuracy and speed inside a building with natural ventilation is one of the important study topics of building design due to the economic importance of energy consumption. For this purpose, in this study, a chamber with certain dimensions and with natural connection has been investigated as a study sample to predict the air flow pattern and speed distribution with the help of regional models. Two air inlet and outlet valves were considered for natural air ventilation. After researching the previous models, the three-dimensional zone model coupled with heat transfer and air flow calculations (ZAER) was chosen as the basis for comparing the modeling results. In the following, after zoning, to improve the flow coefficient factor model, which is assumed to be a constant number, it was assumed to be variable and the results were recorded in different states. The behavior of the model has been checked in the flow coefficients between ۰.۳ and ۱ in order to obtain the most optimal coefficient for the number of suitable cells. Comparing the results of the research with the results of other models and computational fluid dynamics (CFD) showed that the three-dimensional behavior of the flow shows better compatibility with the experimental researches.

Regional model, Air flow, Natural convection, ZAER, Flow coefficient