An analysis of forces for flow around an elliptic cylinder at low Reynolds number has been presented in this work. The finite-volume based open source code OpenFOAM is used for the numerical simulations. pimpleFoam solver is used to solve Navier- Stokes equations for incompressible flow. The combined effects of aspect ratios (AR = 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0), domain sizes (Ds = 30Dh, 40Dh, 50Dh and 60Dh) and Reynolds numbers (Re = 40, 100) on flow fields and various aerodynamic parameters are presented. Here, Dh represents characteristic length, which is two times the semi-major axis. It is found that at Re= 40 , the value of CD,avg decreases with the increase of aspect ratio. While, at Re= 100 , the value of CD,avg first decreases up to AR= 0.5 and then increases for all domain sizes. The contribution of the pressure and viscous force in the flow is studied in detail for both the Reynolds number. The contribution of pressure in lift force at Re= 40 is found to be one to two times higher than that of viscous force. Whereas, at Re= 100 the contribution of viscous force in producing lift force is insignificant. The value of Strouhal number at Re= 100 is non-decreasing for increase in aspect ratio at a given value of domain size.