Department of Mechanical Engineering, IUPUI Christina Koehly Michael Schneider Internship Students from Germany Indiana University - Purdue University.

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Presentation transcript:

Department of Mechanical Engineering, IUPUI Christina Koehly Michael Schneider Internship Students from Germany Indiana 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 5 th 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 PropertyValueUnitsReynolds Number Density1.205kg/m 3 Dynamic Viscosity1.81E-5Ns/m 2 Car Length m 1. Free Stream Velocity35m/s12.17E Free Stream Velocity70m/s24.21E Free Stream Velocity100m/s34.59E+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!