Aerodynamic Design Optimization Harvey Thompson

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Aerodynamic Design OptimizationHarvey
Thompson Colleagues
School of Mechanical Engineering FACULTY OF
ENGINEERING
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Importance of Aerodynamic Drag- Computational
Fluid Dynamics (CFD)- Aerodynamic Design
Optimization via CFD
School of Mechanical Engineering FACULTY OF
ENGINEERING
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Importance of Aerodynamic DragAerodynamics is a
crucial component of a vehicles energy
efficiencyE.g. ETSU (2001) Truck Aerodynamic
Styling over 1/3 of Heavy Goods Vehicles Fuel
Burn related to aerodynamic drag
School of Mechanical Engineering FACULTY OF
ENGINEERING
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Computational Fluid Dynamics (CFD)CFD solving
governing equations of heat and fluid flow on
computers. Can provide ability to carry out
virtual experiments.CFD increasingly
important in vehicle design E.g. US Department
of Energy funded consortium (gt5 million) - best
practice guidelines for CFD in truck design.
School of Mechanical Engineering FACULTY OF
ENGINEERING
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Computational Fluid Dynamics (CFD)E.g. Flow
pastsmall livestock trailer (Ifor Williams)
School of Mechanical Engineering FACULTY OF
ENGINEERING
Wake
wake
Recirculation
recirculation
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Computational Fluid Dynamics (CFD)Flow is
highly turbulent hence need to validate
turbulence model predictions flow in wake
particularly challenging e.g. wind tunnel
testing
School of Mechanical Engineering FACULTY OF
ENGINEERING
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Aerodynamic Design Optimization via CFD
Validated CFD models can be used to investigate
benefits of design changes. E.g. effect of inlet
on ventilation rate for animals.
School of Mechanical Engineering FACULTY OF
ENGINEERING
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Aerodynamic Design Optimization via CFD More
efficient to combine CFD with formal methods for
multi-objective optimization. E.g. effect of
headboard fairing on drag/ventilation Three
possible Three
resultant fairingsdesign parameters
School of Mechanical Engineering FACULTY OF
ENGINEERING
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Aerodynamic Design Optimization via CFD Use
Design of Experiments to minimize number of CFD
calculations needed to generate a response
surface
School of Mechanical Engineering FACULTY OF
ENGINEERING
Small D1
Large D1
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Aerodynamic Design Optimization via CFD Use
response surface to identify best design
subject to your multi-objective criteria.E.g.
Identify minimum dragwith acceptable ventilation
rate for animals.
School of Mechanical Engineering FACULTY OF
ENGINEERING
Small D1
Large D1
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Aerodynamic Design Optimization via CFD Automatic
parametrisation and optimization of aero engine
compressor blade 1 increase in adiabatic
efficiency.
School of Mechanical Engineering FACULTY OF
ENGINEERING
Small D1
Large D1
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Any Questions?
School of Mechanical Engineering FACULTY OF
ENGINEERING
Small D1
Large D1