Design of a rotor of a windmill is very important to extract the energy from the wind. The design of rotor involves the calculation the rotor parameters and its components to produce maximum power. Although the design of a wind mill looks simple, it involves complex and detailed design of its components like rotor, transmission, load matching, yawing mechanism etc. In this paper, aerodynamic analysis of a curved blade for windmill is simulated by comparing NACA standard airfoils. Two-dimensional numerical modelling of the airfoil of the windmill is performed with COMSOL Multiphysics software. The velocity and pressure distribution around airfoil can be checked from the simulation results. The 2D airfoil geometry is realized in COMSOL’s geometry tools. Two dimension and steady state model has been used and boundary conditions are considered within computations as the flow in wind tunnel.