Unit 1 Introduction

8 lecture hours

• - Introduction of air flow
• boundary layer velocity profile
• mechanics of air flow and pressure around a vehicle
• flow separation
• vehicle aerodynamic performance
• characteristics of aerodynamic forces and moments
• drag of a simple bodies plate
• sphere and streamline bodies
• SAE aerodynamic axis system

Unit 2 Aerodynamic lift and drag

7 lecture hours

• - Aerodynamic Drag Pressure (form) drag
• air resistance opposing the motion of a vehicle
• after flow wake
• drag coefficient
• drag coefficient and various body shapes
• base drag
• trailing vortex drag
• attached transverse vortices. lift coefficients
• vehicle lift
• underbody floor height versus aerodynamic lift and drag
• aerofoil lift and drag

Unit 3 Aerodynamic drag reduction and lift control

6 lecture hours

• - Profile edge rounding or chamfering
• bonnet slop and windscreen rake
• roof and side panel cambering
• rear side panel taper
• underbody rear end upward taper
• rear end tail extension
• underbody roughness
• Aerodynamic lift control: under body dams
• exposed wheel air pattern
• partial enclosed wheel air flow pattern
• rear end spoiler
• negative lift air foil wings

Unit 4 Shape optimization of cars

4 lecture hours

• - Front end modification
• front and rear wind shield angle
• boat tailing
• hatch back
• fast back and square back
• notchback drag
• cabriolet cars. dust flow patterns at the rear
• effects of gap configuration
• effect of fasteners

Unit 5 Commercial vehicle aerodynamics fundamental

• - Principles of Commercial Vehicle Aerodynamics
• effect of rounding sharp front cab body edges
• effect of different cab to trailer body heights with both sharp and rounded upper windscreen leading edges
• forebody pressure distribution
• effect of a cab to trailer body roof height step
• Commercial vehicle drag reducing devices: - cab roof deflectors
• yaw angle
• cab roof deflector effectiveness versus yaw angle
• comparison of drag resistance with various commercial vehicle cab arrangement relative to trailer body height
• corner vanes
• cab to trailer

Unit 6 Subject Code

• 3170209 body gap, cab to trailer body gap seals
• tractor and trailer skirting
• comparison of various devices used to reduce vehicle drag
• effect of trailer load position on a vehicle’s drag resistance. 6 Aerodynamic testing: - Wind tunnel testing and measurement: Function
• features and types of wind tunnels
• types of wind tunnel test sections
• divergent and convergent collector in wind tunnel
• test sequence
• measurement of flow velocity
• measurement of flow direction
• pressure measurements
• measurements of aerodynamic loads using wind tunnel balances
• measurement of the frontal area
• flow visualization scale model testing
• full scale testing in wind tunnel On-road testing and measurements: drag measurement using Coastdown tests
• crosswind tests
• on-road cooling tests
• soiling of windows and chassis parts
• on-road measurements of the wind noise

Unit 7 Automobile aesthetics

7 lecture hours

• aerodynamic vehicle development process and importance of the aesthetic aspects
• technical criteria for aesthetic design of exterior and interior
• digital aesthetic design process
• Body styling process: Product planning
• concept sketching and package related sketching
• full sized tape drawing
• clay modelling