Aerodynamic study of Jeff Gordons NASCAR 2000

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Aerodynamic study of Jeff Gordons NASCAR 2000
Christina Koehly Michael Schneider Internship
Students from Germany
Berufsakademie (University of Cooperative
Education) Karlsruhe, Mannheim, Germany
Indiana University - Purdue University
Indianapolis, USA
Faculty Advisor Professor H. U. Akay
Department of Mechanical Engineering, IUPUI
March 2001
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Jeff Gordons NASCAR
(BRICKYARD 400, AUGUST 5th 2000)
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Indianapolis Motor Speedway

• Home of Brickyard 400

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Project Objective

• Use Finite Element code ANSYS/FLOTRAN and Finite
  Volume code StarCD
• Examination of aerodynamic behavior
• Comparison of Velocity Magnitude and Static
  Pressure
• Decision of which program give better results

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THE PROJECT TEAM AT WORK!
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Theory Assumptions

• Incompressible Fluid
• Adiabatic Conditions

• Steady State
• Newtonian Fluid
• Turbulent Model

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ANSYS/FLOTRAN and StarCD Procedure

• Define the problem
• Define Keypoints
• Make Areas from Keypoints
• Create the Finite Element Mesh
• Set Boundary Conditions
• Set Solver Parameters
• Get the results

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Areas
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Meshes
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Boundary Conditions

• All Boundary Conditions were applied to lines
• Velocity applied to surface of the car
• Velocity of 35 m/s, 70 m/s and 100 m/s applied in
  x-direction to inlet and lower free stream
  surface
• Relative Pressure of 0 Pa applied to outlet

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Parameters

• Steady-state with turbulent solver
• Fluid properties set to air in standard SI
• Solver set to perform more than 500 iterations

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RESULTS
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Velocity Magnitude 35 m/s
StarCD Velocity by 35 m/s
ANSYS Velocity by 35 m/s
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Velocity Magnitude 70 m/s
ANSYS Velocity by 70 m/s
StarCD Velocity by 70 m/s
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Velocity Magnitude 100 m/s
StarCD Velocity by 100 m/s
ANSYS Velocity by 100 m/s
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Static Pressure 35 m/s
StarCD Pressure by 35 m/s
ANSYS Pressure by 35 m/s
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Static Pressure 70 m/s
StarCD Pressure by 70 m/s
ANSYS Pressure by 70 m/s
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Static Pressure 100 m/s
StarCD Pressure by 100 m/s
ANSYS Pressure by 100 m/s
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Conclusion

• Both programs are good to solve these problems
• For easy geometries ANSYS/FLOTRAN should be used
  to get fast results
• For complex geometries StarCD gives more
  reasonable results, but it takes more time to
  define the boundary conditions

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THE END!