Numerical-Experimental Geometric Optimization of the Ahmed Body and Analyzing Boundary Layer Profiles

The Ahmed body with a rectangular rear end is a simplified, canonical bluff body geometry that shares similarities with generic road vehicles. It is known to produce flow separations and strong vortices at the rear end. The aerodynamic performance of vehicles is significantly affected by such three-dimensional flow structures. This work proposed a modified Ahmed body with an elliptical rear end called the elliptical Ahmed body. The study examines in detail the near-field characteristics of the flow over the elliptical Ahmed body at a slant angle of 25{degree sign} with a low Reynolds number of 1.4 x 104 based on the model height. The principal flow features are analyzed using time-resolved and standard particle image velocimetry. The time-averaged and time-resolved analyses revealed a flow transition at the rear end that eliminated the slant separation bubble. Furthermore, a significant wake flow restructuring is found to curb the lower recirculation bubble and shift the upper recirculation bubble towards the slant surface. Several distinct Strouhal numbers are found over the slant surface and wake region. In addition, the effect on coherent structures is evaluated using proper orthogonal decomposition and dynamic mode decomposition, which shows a considerable difference between the standard and elliptical Ahmed body wake structures. The results of this investigation show that body modification of the Ahmed body using elliptical curvature at the rear end can significantly affect the overall flow features and help improve the aerodynamics performance of the vehicles.

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Experimental investigation of the flow features around an elliptical Ahmed body

Siddiqui

Agelin‐Chaab

2022

Physics of Fluids

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Numerical-Experimental Geometric Optimization of the Ahmed Body and Analyzing Boundary Layer Profiles

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Experimental investigation of the flow features around an elliptical Ahmed body

Experimental investigation of the flow features around an elliptical Ahmed body

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