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Asian Journal of Scientific Research
  Year: 2011 | Volume: 4 | Issue: 3 | Page No.: 236-245
DOI: 10.3923/ajsr.2011.236.245
 
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Study of the Wind Tunnel Effect on the Drag Coefficient (CD) of a Scaled Static Vehicle Model Compared to a Full Scale Computational Fluid Dynamic Model

Sanwar A. Sunny

Abstract:
The current study highlighted the relationship between the drag coefficients (CD) of two models of varying scales but sharing geometric and dynamic similitude. Applying principles of fluid mechanics, especially Bernoulli’s law and by scaling models using Reynold’s Number (Re) and the Buckingham Pi Theorem at varying velocities u0, drag forces FD were found by conducting wind tunnel tests. The scaled drag coefficient was then compared to a full scaled model in a virtual wind tunnel setting of a Computational Fluid Dynamic (CFD) program. Discrepancies were addressed and error margins were discussed. Real analysis (CD of 0.4) show a 10% deviation from the literature data (CD of 0.44) while a thorough computational test (CD of 0.428) showed 2.73% reduction from real manufacture data, contributed to the negligence of the governing flow equations of Navier Stokes, such as modeling principles relative to turbulence. In all, virtual simulation maintained a 7% increase from real test data which is attributed wholly to boundary conditions at the start of computational tests. CFD shortcomings, mainly from exclusion of turbulence during computation are discussed by briefly introducing and comparing Reynolds-Averaged Navier Stokes Equations (RANS) and the Large Eddy Simulation (LES) Techniques.
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How to cite this article:

Sanwar A. Sunny , 2011. Study of the Wind Tunnel Effect on the Drag Coefficient (CD) of a Scaled Static Vehicle Model Compared to a Full Scale Computational Fluid Dynamic Model. Asian Journal of Scientific Research, 4: 236-245.

DOI: 10.3923/ajsr.2011.236.245

URL: https://scialert.net/abstract/?doi=ajsr.2011.236.245

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