Airflow simulation in solar greenhouse using CFD model

Air flow plays an important role in regulating the indoor environment for the northeast regional greenhouse, therefore it is necessary to study the air flow characteristics in the solar greenhouse. The Fluent software was used to establish solar greenhouse model based on the computational fluid dynamics (CFD) method. The three-dimensional numerical simulation was done based on the standard turbulence model for the solar greenhouse. During simulation process, taking inside and outside the air in solar greenhouse as the research object, interior space along with its surrounding outdoor space was regarded as part of the CFD calculation field. Air distribution and change in solar greenhouse was numerically simulated and tested, and wind speed of numerical simulation was compared with that of experiment data. The results showed that the maximum error between them was less than 9%, and the numerical results had a good agreement with the experiment data, and the distributions of velocity of flow fields were obtained from the simulated results of solar greenhouse. The simulation results simulated airflow state that airflow flowed in from windows and then out along the bottom vents of solar greenhouse and the speed of air at bottom of air vents was uniformly distributed with eddy current formed at the bottom of solar greenhouse. The simulated results directly showed its properties and state of the flow fields. In this paper, the simulation results provide a theoretical basis for optimization design and environmental regulation for the northeast region of solar greenhouse.