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Numerical Investigation of External Flow around the Ahmed Reference Body Using Computational Fluid Dynamics

Author Affiliations

  • 1 School of Mechanical and Building Sciences, VIT University, Vellore-632014, TN, INDIA

Res. J. Recent Sci., Volume 1, Issue (9), Pages 1-5, September,2 (2012)


This paper presents a finite-element based numerical simulation for the prediction of flow around the Ahmed body. The flow solver used is ACUSOLVE, developed by ACUSIM software. In this investigation an effort was made to investigate the fully developed turbulent flow over Ahmed Body and to evaluate the effect of slant angle. Understanding this aerodynamic phenomenon helps us in reducing fuel consumption, increase the stability and passenger comfort. In this study, the spalart-allmaras (S-A) turbulence model is used in order to reduce the computational cost at high Reynolds number. Two separate cases have been solved for two different upstream velocities and results are compared. The results are presented in the form of drag coefficient values and flow field which includes velocity contour and velocity vector fields. The validation is carried out by a simulation around the Ahmed body with the slant angle of 25° with stilts. The results are compared with the actual wind-tunnel experimental data. Moreover, the capabilities of ACUSOLVE code to predict the flow around the Ahmed Body has been analyzed by comparing the flow structure at wake region with experiments. The pre-processing & post processing for this study is carried out with the help of HYPERMESH and HYPERVIEW software respectively.


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