Nowadays, thermal comfort in an indoor environment is one of the most important aspects related to the general comfort encountered in human life. In this framework, numerous studies have been done in the aim to evaluate the parameters that affect the indoor thermal comfort. This paper focuses on a numerical investigation of Reynolds number (Re) effect on the airflow characteristics and the discomfort due to the draft for a ventilated cabin prototype. A series of numerical simulations were performed using the software ANSYS FLUENT 17.0. As observed in the numerical results, the Reynolds number has a major impact on the velocity fields, the static pressure and the turbulence characteristics. Hence, robust correlations between the velocity, the turbulence characteristics and the Reynolds number were presented. Furthermore, the numerical results highlighted that the Reynolds number has a direct impact on the discomfort due to the draft. In the median plane, the maximum value of predicted Percent Dissatisfied due to the draft (PD %) for Re = 6666 decreased by 2.7, 2.07 and 1.58 times the values reached by Re = 26666, Re = 20000 and Re = 13333 respectively. Accordingly, this paper presents the behaviour of airflow in the indoor environment that it will be useful in buildings design.

In an indoor environment, many factors may affect the airflow characteristics and thermal comfort. Hence, a lot of research has been carried out in order to investigate the impact of these factors. The purpose of this study is to determine the effect of supply area, with maintaining the same supply airflow rate, on the airflow characteristics and the indoor thermal comfort for a ventilated box prototype occupied by a thermal manikin. Understanding the behavior of the airflow in a mechanical ventilated box occupied by a thermal manikin is the main objective of this paper. Hence, numerical simulations were carried out using the software ANSYS FLUENT 17.0. According to the obtained results, the inlet velocity has a direct effect on the velocity fields, the temperature, the static pressure and the turbulence characteristics. In addition, the numerical results affirmed that the supply area has a direct impact on indoor thermal comfort.

The greenhouse serves as an enclosed structure designed to create a conducive environment for agricultural productivity, irrespective of the challenges posed by seasonal variations. Recognizing the contemporary complexities in agricultural management, our research endeavors involve the development of a comprehensive numerical model and the establishment of an experimental setup to delve into the nuanced impact of mechanical ventilation. Specifically, the study investigates the influence of four different entrance velocity values on airflow dynamics within agricultural greenhouses. The results illuminate the direct correlation between inlet velocity and various crucial variables, including temperature distribution, velocity field distribution, DO irradiation distribution, and static pressure distribution. Notably, at Vint = 12 m.s-1, the maximum temperature remains below Tmax = 307 K, while at Vint = 3 m.s-1, it reaches Tmax = 327 K. This underscores the pivotal role of accurate modeling and control for the optimal management of agriculture in the central region of Tunisia, particularly in Sfax.