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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

Truck Aerodynamic Improvement using CFD

ME 491 Project

Department of Mechanical Engineering, IUPUI

Julia Zafian-Short

December 2004

outline
Outline
  • Goals and Approach
  • Computational Setup
  • Results
  • Design Improvements
  • Summary and Conclusions
goals and approach
Goals and Approach
  • To quickly improve truck aerodynamics.
  • Apply 2-D CFD using Star-design.
  • Quantitative post processing using starviz.
computational setup
Computational Setup
  • Domain and boundary conditions
  • Mesh
    • Parameters
    • Cell type and sizes (near wall and far field)
  • Solver parameters
    • Equations
    • Differencing scheme
    • Convergence criteria
domain and boundary conditions
Domain and boundary conditions

Pressure (0 Pa gage)

Pressure (0 Pa gage)

Inlet (30m/s)

Slip Wall

slide6
Mesh

Default Star-Design Settings

Tetrahedral cells in far field with prism around walls

solver parameters
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
results
Results
  • Velocity
  • Pressure
  • Streamlines
velocity 0 50 m s increment 5
Velocity0-50 m/s, Increment 5

Non-Uniform At Boundary

High Velocity Gradient

Recirculation

design improvements
Design Improvements
  • Geometry modifications
  • Computational results
    • Velocity
    • Pressure
  • Drag comparison
summary and conclusions
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%