OICC Press International Journal of Energy and Environmental Engineering 2251-6832 3 1 (December 2012) 2012 08 20 Analysis of free and forced convection in airflow windows using numerical simulation of heat transfer 10.1186/2251-6832-3-14 EN Mohammad Ghadimi Department of Energy Engineering, Science and Research Branch, Islamic Azad University, Tehran, P.O. Box 147789385, IR Hossein Ghadamian Department of Energy Engineering, Science and Research Branch, Islamic Azad University, Tehran, P.O. Box 147789385, IR Aliasghar A Hamidi Department of Chemical Engineering, Tehran University, Tehran, P.O. Box 147789385, IR Farivar Fazelpour Department of Energy System Engineering, Islamic Azad University of South Tehran Branch, Tehran, IR Mehdi A Behghadam Department of Mechanical Engineering, Islamic Azad University of Roudehen branch, Tehran, IR Journal Article 2012 08 20 Abstract The present paper describes a two-dimensional finite volume numerical simulation of flow and heat transfer in airflow windows by free and forced convection techniques. The governing equations are the fully elliptic, Reynolds-averaged Navier–Stokes equations. The simple algorithm is employed to correct the pressure term. The second-order upwind scheme is used to discretize the convection terms. The ( k - ε /RNG) turbulence model is applied for the flow simulation. The mesh used is the body-fitted, multi-plane grid system. Results on the variations of velocity and temperature profiles with geometrical parameters, at different temperature and velocity, for heat transfer by free and forced convection techniques are presented. Comparisons of the present results on temperature distribution for forced convection and for free convection with the available experimental forced convection data indicate that the airflow-influenced forced convection methods are considerably enhanced.