Fundamentals of Aerodynamics:
Scope- concept of bluff body, Generic Shapes, relevance of these shapes to ground vehicles. Pressure drag and viscous drag, flow phenomenon related to vehicles- External and Internal flows, Resistance to vehicle motion, flow field around car, aerodynamic development of cars, Optimization of car bodies for lower drag
Stability, Safety and Comfort:
The origin of forces and moments- effects- vehicle dynamics, under side wind forces and moment coefficients- safety limits, design stage measures, important factors affecting aerodynamics like rear slant, cross winds, engine cooling air flow, under body flow, wheel rotation, air flow around individual components, high performance vehicles, very long
Wind Tunnels and Test Techniques:
Principles of wind technology- limitations of simulation- simulation based optimization of geometrics, drag reduction technologies- surface shaping, scaled models. Wind tunnel experiments- measurement of pressure coefficients, drag force, wind tunnel limitations and corrections- boundary layer control, wind tunnel blockage, climatic tunnels, measuring equipment and transducers-pressure measurement, velocity measurement, flow visualization techniques, Wind noise measurement.
Application of CFD:
Methods to solve Navier – stoke equations, forces acting on fluid element, compressibility effect in a flow field, inviscid flow, governing equations, irritation flow field and consequences, potential flow, boundary layer methods. Important requirements of CFD solvers, Geometric/ Dynamic similarity, robust flow solver. Turbulence models, Numerical modelling of fluid flow around vehicle body.
Aerodynamic Design:
Development and simulation of cars, buses, trucks, surface motion, surface permeability, mass addition, energizing flow around the vehicle
Course outcomes:
At the end of the course the student will be able to:
CO1:Analyse the stability of vehicle and comfort to occupants
CO2:Conduct wind tunnel testing for flow visualization ,analyse and interpret the results
CO3: Calculate different aerodynamic forces
CO4:Choose the appropriate CFD solvers and do numerical modelling of fluid flow
CO5:Create aerodynamically designed vehicle body using CFD
Question paper pattern:
The SEE question paper will be set for 100 marks and the marks scored will be proportionately reduced to 60.
Textbook/ Textbooks
(1) W. H. Hucho, Aerodynamics of Road vehicles , Butterworth and Co Ist Edition1987
(2) Schlichting H, Boundary Layer Theory Mc. Graw Hill, New York 7 thEddition 1975
Reference Books
(1) Pope A , Low speed Wind tunnel Testing, John Wiley and Sons, New York3 rd Edition, 1999
(2) Society of Automotive Engineers , SAE Vehicle Aerodynamics Packet Society of Automotive Engineers, Edition ,2006