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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
THE AHMED BODY’S EXTERNAL AERODYNAMICS AT 25° SLANT ANGLE REAR SURFACE: A NUMERICAL ANALYSIS USING CFD
Submission Author:
Jorge Chavez , SC
Co-Authors:
Jorge Chavez , Emilio Vera, Amir Antonio Martins Oliveira, Leonel R Cancino
Presenter: Jorge Chavez
doi://10.26678/ABCM.ENCIT2020.CIT20-0060
Abstract
In this work, a numerical computational fluid dynamics approach of the field flow around the Ahmed’s body reference geometry was performed. The main target was to analyze the external aerodynamics looking at the main relevant aspects as vortex generation, velocity and pressure fields, fluid separation and reattachment as well as the drag and lift contributions of each surfaces in the body. Domain and mesh independence tests were performed in order to numerically warrant no influence on the results. Four turbulence models were used in order to better elucidate the numerical effect of the turbulence model in the results. Experimental data from literature was then used to assess the numerical procedures adopted along this work as well as to identify the turbulence model that better fits the experimental results in terms of drag and lift forces. Numerical results shows that the realizable - " turbulence model well approximates the drag with 3.9% difference to experimental results and the Reynolds Stress Model better fits the lift with 2.8% difference to experimental results.
Keywords
Ahmed’s body reference geometry, Computational Fluid Dynamics, Road vehicle aerodynamics, Drag and lift forces, Turbulence Models
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