Wheel aerodynamics Cooling flow
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Transcript Wheel aerodynamics Cooling flow
Reduced aerodynamic drag of road
vehicles by better design of tyre, wheel
and cooling airflow control
Time Period: May 2013- May 2017
Budget: 8,000,000 Sek
Partners: Volvo Cars, Scania, and Volvo
Trucks
Background
45%
30%
25%
Contributions to the aerodynamic drag
from different parts of a passenger car
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Teddy Hobeika
09-Oct-2014
Research Areas
Cooling flow
Wheel aerodynamics
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Expected Outcomes
Cooling flow focus
on measurements
Wheel aerodynamics
focus on simulations
Improved method for
Clarify uncertainties of
cooling flow
measurement
Quick measuring
capability with little
model preparation time
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Teddy Hobeika
wheel and tyre modeling
in Computational Fluid
Dynamics
Validate a simulation
procedure that provides
higher accuracy keeping
low resource cost
09-Oct-2014
Research Project Status
Investigating uncertainties in CFD simulations
with focus on tyre aerodynamics has been carried
out
Uncertainties introduced with different methods of
modelling wheel rotations have been identified
and methods to overcome them have been
suggested
Validation of the new methods is still pending
more data and test comparison
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Teddy Hobeika
09-Oct-2014
Publications
“Investigation of the Influence of Tyre Geometry on the
Aerodynamics of Passenger Cars” SAE Journal Paper in
“SAE International Journal of Passenger Cars – Mechanical
systems”, Volume 6 Pages 316-325, doi: 10.4271/ 2013-010955
“Influence of Rims and Tyres on the Aerodynamic
Resistance of Passenger Vehicles” Conference proceeding
paper presented at 11th Conference "Aerodynamik
Kraftfahrzeug", Munich, Germany July 2014,
“Study of different tyre simulation methods and effects on
passenger car aerodynamics” Conference proceeding paper
to be presented at “International Vehicle Aerodynamics
Conference”, Louborough, UK during October 2014
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Teddy Hobeika
09-Oct-2014
Example of Tyre Detail Effect
Adding side grooves
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Complete Pattern Effect
Test Measurement
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Teddy Hobeika
Slick Tyres CFD
Pattern Tyres CFD
09-Oct-2014
New Method Preliminary Results
Standard Rotation Method
New Rotation Method
Rotating wall boundary
condition on complete
geometry
Rotating wall boundary
condition & Moving
Reference Frame on
purple details
Ground
Ground
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Teddy Hobeika
09-Oct-2014
Cooling Flow Measurements
Example of flow distribution through a radiator
Velocity (m/s)
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Teddy Hobeika
09-Oct-2014
Future work
A licentiate is scheduled for May 2015
Simulations on the way with different rim designs
for analysis of rim tyre interaction
A second round of wind tunnel tests is planned for
early 2015 to run more configurations to correlate
changes in mass flow to changes in the overall
forces of a the vehicle.
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Teddy Hobeika
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Thank You for Your Attention
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Teddy Hobeika
09-Oct-2014