Drag is the force that opposes an aircraft's motion through the air, according to NASA. A car simply isn't designed to go through a brick wall. In 1738, the Dutch-Swiss mathematician Daniel Bernoulli published Hydrodynamica, in which he described the fundamental relationship between pressure and velocity, known today as Bernoulli's principle. In about 1779, Englishman George Cayley discovered and identified the four forces which act on a heavier-than-air flying vehicle: lift, drag, weight, and thrust - thus revolutionising the pursuit for human flight. AERODYNAMICS In addition to definition given in submodule 8.1 aerodynamics as the science describing body’s - movement in an air. It was devised by German-American mathematician Max Munk and further refined by British aerodynamicist Hermann Glauert and others in the 1920s. Thus here i am trying to simplify the concepts and basics of aerodynamics for people who likes to start from the scratch in field of aerodynamics and aeronautics. Computational fluid dynamics was started as an effort to solve for flow properties around complex objects and has rapidly grown to the point where entire aircraft can be designed using a computer, with wind-tunnel tests followed by flight tests to confirm the computer predictions. Jakob Ackeret led the initial work on calculating the lift and drag on a supersonic airfoil.  This states that the pressure of a flowing fluid decreases as its velocity increases and as such was a significant early advance in the theory of fluid dynamics, and was first quantified in an equation derived by Leonhard Euler. An aircraft designer must consider four main factors and their interrelationships: weight of the aircraft and the load it will carry; lift to overcome the pull of gravity; drag , or the forces that retard motion; and thrust , the driving force. Ackeret presented a design for a supersonic wind tunnel. Air resistance experiments were carried out by investigators throughout the 18th and 19th centuries. In most cases, such as in automobiles and aircraft, drag is undesirable because it takes power to overcome it. Module 8 Basic Aerodynamics Issue 1. Andrea Quintarelli looks at the complex field of racecar aerodynamics. Early records of fundamental aerodynamics concepts date back to the work of Aristotle and Archimedes in the 2nd and 3rd centuries BC, but efforts to develop a quantitative theory of air flow did not begin until the 18th century. Air resistance experiments were performed by investigators throughout the 18th and 19th centuries, aided by the construction of the first wind tunnel in 1871. The problem was remedied by adding a "dive flap" beneath the wing which altered the center of pressure distribution so that the wing would not lose its lift..  Equations for fluid flow with friction were developed by Claude-Louis Navier and George Gabriel Stokes. In 1884, John J. Montgomery, an American trained in physics, began experimenting with glider designs. There are, however, some cases when drag is beneficial, such as with parachutes, for example. Ludwig Prandtl became one of the first people to investigate boundary layers during this time. Sir George Cayley of England is generally recognized as the father of modern aerodynamics. In compressible aerodynamics, density and pressure both change, which is the basis for calculating the speed of sound. The ratio of the flow speed to the speed of sound was named the Mach number after Ernst Mach, who was one of the first to investigate the properties of supersonic flow which included Schlieren photography techniques to visualize the changes in density. He was the instructor for most of the famous aerodynamicists of our time. Newton was the first to develop a mathematical model for calculating the speed of sound, but it was not correct until Pierre-Simon Laplace accounted for the molecular behavior of gases and introduced the heat capacity ratio. The effect is named for Henri Coandă, the Romanianaerodynamicist who exploited it in many of his patents. It is a sub-field of fluid and gas dynamics, and the term "aerodynamics" is often used when referring to fluid dynamics. In 1958 the first definition of aerospace engineering appeared, considering the Earth’s atmosphere and the The fascination with flight has been the fuel that has motivated notable scientists and inventors to learn about aerodynamics for hundreds of years.
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