Train Set Coaches so that they can glide Air very smoothly and increase speed than the normal LHB Coaches used in Indian Railways. Railway Ministry also gave proposal to use "Aerodynamics" in the LHB Coaches of present Rajdhani Expresses to convert it to Train Sets.
Now
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What is Aerodynamics ?
Ans: Aerodynamics, from Greek ἀήρ aer (air) + δυναμική (dynamics), is a branch of Fluid dynamics concerned with studying the motion of air, particularly when it interacts with a solid object, such as an airplane wing. Aerodynamics is a sub-field of fluid dynamics and gas dynamics, and many aspects of aerodynamics theory are common to these fields. The term aerodynamics is often used synonymously with gas dynamics, with the difference being that "gas dynamics" applies to the study of the motion of all gases, not limited to air.Formal aerodynamics study in the modern sense began in the eighteenth century, although observations of fundamental concepts such as aerodynamic drag have been recorded much earlier. Most of the early efforts in aerodynamics worked towards achieving heavier-than-air flight, which was first demonstrated by Wilbur and Orville Wright in 1903. Since then, the use of aerodynamics through mathematical analysis, empirical approximations, wind tunnel experimentation, and computer simulations has formed the scientific basis for ongoing developments in heavier-than-air flight and a number of other technologies. Recent work in aerodynamics has focused on issues related to compressible flow, turbulence, and boundary layers, and has become increasingly computational in nature.
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Applicable Fields of Aerodynamics:
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Aerodynamics is important in a number of applications other than aerospace engineering. It is a significant factor in any type of vehicle design, including automobiles. It is important in the prediction of forces and moments in sailing. It is used in the design of mechanical components such as hard drive heads. Structural engineers also use aerodynamics, and particularly aeroelasticity, to calculate wind loads in the design of large buildings and bridges. Urban aerodynamics seeks to help town planners and designers improve comfort in outdoor spaces, create urban microclimates and reduce the effects of urban pollution. The field of environmental aerodynamics studies the ways atmospheric circulation and flight mechanics affect ecosystems. The aerodynamics of internal passages is important in heating/ventilation, gas piping, and in automotive engines where detailed flow patterns strongly affect the performance of the engine. People who do wind turbine design use aerodynamics. A few aerodynamic equations are used as part of numerical weather prediction.
For more info :
Aerodynamics---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
How Aerodynamics is Used in Railway Sector ?
Ans: Please see the Attached PDF Document(76 Pages) on "Aerodynamics of High Speed Trains" a Lecture delivered by
Dr Alexander Orellano
Manager Center of Competence for Aerodynamics & Thermodynamics
Bombardier Corporation
Link of this PDF Document:
click hereAttached Image:
12695 Chennai-Trivandrum SF arriving at Platform No.1 in Kollam Junction Railway Station
Link:
click hereA vortex is created by the passage of an aircraft wing, revealed by smoke. Vortices are one of the many phenomena associated with the study of aerodynamics.
Link:
click here 
