department of mechanical engineering, iupui christina koehly michael schneider internship students...
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Department of Mechanical Engineering, IUPUI
Christina KoehlyMichael Schneider
Internship Students from GermanyIndiana University - Purdue University
Indianapolis, USA
Berufsakademie (University of Cooperative Education)
Karlsruhe, Mannheim, Germany
Faculty Advisor: Professor H. U. Akay
Aerodynamic study of Jeff Gordon’s NASCAR 2000
March 2001
Jeff Gordon’s NASCAR
(BRICKYARD 400, AUGUST 5th 2000)
Indianapolis Motor Speedway
Home of Brickyard 400
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
THE PROJECT TEAM AT WORK!
Theory: Assumptions
• Incompressible Fluid• Adiabatic Conditions
• Steady State• Newtonian Fluid• Turbulent Model
Property Value Units Reynolds Number
Density 1.205 kg/m3
Dynamic Viscosity 1.81E-5 Ns/m2
Car Length 5.195843 m
1. Free Stream Velocity 35 m/s 12.17E+06
2. Free Stream Velocity 70 m/s 24.21E+06
3. Free Stream Velocity 100 m/s 34.59E+06
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
Areas
Meshes
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”
Parameters
• Steady-state with turbulent solver
• Fluid properties set to air in standard SI
• Solver set to perform more than 500 iterations
RESULTS
Velocity Magnitude 35 m/s
StarCD: Velocity by 35 m/s ANSYS: Velocity by 35 m/s
Velocity Magnitude 70 m/s
StarCD: Velocity by 70 m/s ANSYS: Velocity by 70 m/s
Velocity Magnitude 100 m/s
StarCD: Velocity by 100 m/s ANSYS: Velocity by 100 m/s
Static Pressure 35 m/s
StarCD: Pressure by 35 m/s ANSYS: Pressure by 35 m/s
Static Pressure 70 m/s
StarCD: Pressure by 70 m/s ANSYS: Pressure by 70 m/s
Static Pressure 100 m/s
StarCD: Pressure by 100 m/s ANSYS: Pressure by 100 m/s
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
THE END!