To design a comfortable indoor and outdoor environment requires detailed information of airflow in and around buildings .The existing simplified analyses and empirical approaches are inadequate to obtain the needed information. This paper demonstrates how the computational fluid dynamics (CFD) technique can be used by engineers to calculate the airflow distributions in and around a building. Architects can use the airflow distributions to modify their design. This design procedure shows a model of how the architects and engineers can work together to design a sustainable building.