Abstract: In a rectangular room of scale model, we have simulated the turbulent airflows in two dimensions. These simulations have aimed to determine dynamic and thermal fields with a view to do recommendations to realize the natural ventilation in a room to reach a sufficient thermal comfort. Three simulations have being performed in following order in the different configurations: C12, C13 and C23. The results of those have seemed to show difficulties to ventilate the room. These difficulties proceeded from the incapability to guide air at will. So, we have noticed that the level of velocity was feeble in central regions which were often occupied in a room.