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Abstract-In this report coefficient of drag and coefficient of lift is obtained with the help of CFD, it is also obtained by an experiment which is conducted on wind tunnel. Though both of the methods give approximate result for the same test section, an experimental process has greater cost and quite laborious than that of CFD. Analysis of airfoil over two-dimensional subsonic flow at a various angle of attacks and operating at Reynolds's number is obtained. The result shown by CFD has closely agreed with experiment result, thus CFD is a mature tool to predict the performance of test section at any angle of attack.Keywords-Flow separation, angle of attack, CFD, coefficient of lift and coefficient of drag, pressure coefficient etc. INTRODUCTIONIt is fact of common experience that a body in motion through a fluid experiences a resultant force mainly a resistance to a motion. A class of body exists, for which the component of resultant force normal to the direction of motion is many times greater than the component resisting the motion [1]. An airfoil is a streamlined body found in airplanes, propellers, turbines and many other applications. When an airfoil body passing through any fluid it produces an aerodynamic force which is due to pressure distribution over the body surface and shear stress distribution over the body surface. This aerodynamic force can be resolved into two components known as lift and drag. The force which acts in perpendicular to the direction of motion is called as lift force, and the force which is parallel to the direction of motion is called as drag force. Lift is generated by aerofoil primarily depends upon surface area and angle of attack. The drag force mainly depends upon the body surface and fluid which is flows over it. This lift and drag force are obtained with the help of wind tunnel. A wind tunnel is a machine which used in aerodynamic research to study the effects of air moving on solid objects. A wind tunnel consists of a tubular passage with the object under test mounted in the middle. Air is then moving past the object by a powerful fan system or other means. The test object often called a wind tunnel model, is instrumented with suitable sensors to measure aerodynamic forces, pressure distribution, or other aerodynamics-related characteristics. The advance in computational fluid dynamics modeling on a high speed digital computer has reduced the demand for wind tunnel testing. However, CFD results are still not completely reliable and wind tunnels are used to verify CFD predictions.

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