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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL SIMULATION OF THE PRESSURE AND DRAG FORCES AROUND THE AHMED BODY UNDER TURBULENT FLOW
Submission Author:
Jalusa Maria da Silva Ferrari , DF
Co-Authors:
Jalusa Maria da Silva Ferrari, Luciano Goncalves Noleto, Jhon Goulart, Fábio Kayser
Presenter: Jalusa Maria da Silva Ferrari
doi://10.26678/ABCM.ENCIT2020.CIT20-0615
Abstract
The objective of the present paper is to evaluate the turbulent flow around the Ahmed body immersed in air to determine aerodynamic coefficients for different slant angles. The bidimensional non-stationary analysis of an incompressible flow around the Ahmed body is carried for three different rear angles which are 0°, 10° and 25°. The numerical simulations were performed under the same Reynolds number, Re = 94 000, based on the free streamwise velocity, u∞, the longitudinal length of the Ahmed body, l, and the kinematic viscosity of the work fluid, ν. The additional diffusivity caused by the turbulent motion was approached using the Boussinesq’s idea through the k-ω SST. In the paper, aerodynamic coefficients of drag and lift, pressure and velocity fields are presented to characterize the Ahmed body for different slant angles, as well as the flow detachment point, determined through the dimensionless skin friction factor distribution on the body’s surface. Numerical simulations were compared with available results in open literature and showed agreement with other authors. The drag coefficient in the body with slant angle of 25° was found to matche with the drag coefficient equation proposed by Bello-Millán et al. (2016) as a function of Reynolds number.
Keywords
Ahmed Body, Turbulent flow, Vehicular aerodynamics, fluid mechanics, CFD
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