As long as two surfaces move relatively to each other, friction can't be avoided. And the verse effects of friction are quite obvious. Hence aerodynamics studies the movement of bodies in space (air) or the way air moves over the surface of bodies in order to reduce friction by accurate and stylish streamlining.
Not just that, aerodynamics engineers do also take advantage of the air moving over the surface of a body to keep fast moving bodies on the ground as seen in sports cars (e. g. check the design of the enzo Ferrari and read about spoilers). On the other way round, it can also apply this advantage in lifting a body from the ground.
In Turbines, aerodynamics is applied to perfectly direct air flow into the compressor; this is also seen in the car radiator positioning and design.
All these must be done with precision and fashion to suite a good design condition.
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