Vahid Abdi - Department of Mechanical Engineering, Razi University of Kermanshah, Iran
Farzad Veysi

In this study, numerical analysis of the effect of external flow turbulence and aspect ratio of building on the amount of opening discharge coefficient in natural ventilation is reviewed by modelling. The solution is the use of computational fluid dynamics (CFD) approach by Fluent Software and to understand taken properly of the result of numerical solution, the result of experimental solution that had been obtained by others is used. All the obtained results are gotten in three-dimensional space assuming steady state flow and incompressible fluid. Turbulent model was used is standard k-ε that has the most accommodation with experimental results. At the end of the study, this conclusion was reached that the amount of opening discharge coefficient is increased by increasing the number of Reynolds in opening and with increasing the width to length ratio of building the amount of discharge coefficient decreases. And finally it is concluded that by increasing of the turbulence of external flow, discharge coefficient decrease

Computational fluid dynamics (CFD), Discharge coefficient, Natural ventilation through, Incompressible flow, Steady-state flow