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Truck Aerodynamic Improvement using CFD

Truck Aerodynamic Improvement using CFD. ME 491 Project Department of Mechanical Engineering, IUPUI Julia Zafian-Short December 2004. Outline. Goals and Approach Computational Setup Results Design Improvements Summary and Conclusions. Goals and Approach.

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Truck Aerodynamic Improvement using CFD

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  1. Truck Aerodynamic Improvement using CFD ME 491 Project Department of Mechanical Engineering, IUPUI Julia Zafian-Short December 2004

  2. Outline • Goals and Approach • Computational Setup • Results • Design Improvements • Summary and Conclusions

  3. Goals and Approach • To quickly improve truck aerodynamics. • Apply 2-D CFD using Star-design. • Quantitative post processing using starviz.

  4. Computational Setup • Domain and boundary conditions • Mesh • Parameters • Cell type and sizes (near wall and far field) • Solver parameters • Equations • Differencing scheme • Convergence criteria

  5. Domain and boundary conditions Pressure (0 Pa gage) Pressure (0 Pa gage) Inlet (30m/s) Slip Wall

  6. Mesh Default Star-Design Settings Tetrahedral cells in far field with prism around walls

  7. Solver Parameters • Assume Incompressible air for flow field • Solve Momentum Equations • Solve Continuity Equation • Using k-epsilon turbulence model • Convergence Criterion, 0.001 Mass Residual • Using Upwind Differencing Discretization

  8. Results • Velocity • Pressure • Streamlines

  9. Velocity0-50 m/s, Increment 5 Non-Uniform At Boundary High Velocity Gradient Recirculation

  10. Pressure99,000-101,500 Pa, Increment 2500

  11. Streamlines

  12. Design Improvements • Geometry modifications • Computational results • Velocity • Pressure • Drag comparison

  13. Modified Truck Velocity

  14. Modified Truck Pressure

  15. Streamlines for Modified Truck Reduced Wake

  16. Summary and Conclusions • There may be some error due to the cells being large in high gradient regions. • There may be some problems due to upwind differencing. • Drag produced on the 2D truck is 8212.56 N for a 2m wide truck, with 0.15% flow error. • Drag produced on the modified is 4767.52 N for a 2m wide truck, with 0.3% flow error. • The modifications reduce the drag by about 42%

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