European Journal of Electrical Engineering – n° 1-2/2017, 7-17 Investigation on the possibility of substituting compression cooling cycle with a solar absorption cooling cycle in tropical regions of Iran Tohid Adibi 1, *,Omid Adibi 2 , Aria Amrikachi 3 1. Department of mechanical engineering, University of Bonab, Bonab, Iran 2. Department of mechanical engineering, Sharif University, Tehran, Iran 3. Department of mechanical engineering, Shahid Beheshti University, Tehran, Iran Tohidadibi@Bonabu.ac.ir ABSTRACT. In this paper, cavity flow is simulated numerically. Forced convection in different Reynolds number between 100 and 5000 is simulated. Different and complex thermal boundary conditions are applied and various parameters are calculated numerically. Up wall and down walls are in constant temperature and left and right walls are thermal insulation in the first thermal boundary condition. The Left and the down walls are in constant temperature and temperature of the up and the right walls changes linearly in the second thermal boundary condition. For third thermal boundary condition, the left and the down walls are in constant temperature and temperature of the up and the right walls changes sinusoidally. For this purpose, a code is written in the FORTRAN software. Streamlines, isotherms, velocity and temperature in centerlines of cavity, Nusselt number and mean Nusselt number are obtained and shown in different figures and one table. Grid independence is surveyed and some obtained results are validated with other researchers work. In these simulations, Prandtl number is considered to be 0.71 because of air’s Prandtl number. For time discretization, a fifth-order Runge-Kutta is used and for convective fluxes, averaging scheme with forth-order damping term is applied. To calculate second order derivations, secondary cells are used by aid of the Green theorem. RÉ SUMÉ . Dans cet article, l’écoulement dans la cavité est simulé numériquement. La convection forcée dans différents nombres de Reynolds entre 100 et 5000 est simulée. Des conditions aux limites thermiques différentes et complexes sont appliquées et divers paramè tres sont calculés numériquement. Les murs du haut et du bas sont soumis à température constante et les murs de gauche et de droite constituent une isolation thermique dans la première condition aux limites thermiques. Les murs de gauche et du bas sont soumis àtempérature constante et celle des murs du haut et de droite changent linéairement dans la deuxième condition aux limites thermiques. Pour la troisième condition aux limites thermiques, les murs de gauche et du bas sont soumis à température constante et la