Aerodynamic Performance of Several Passive Vortex Generator Configurations on an Ahmed Body Subjected to Yaw Angles

VISWANATHAN, Harish (2021). Aerodynamic Performance of Several Passive Vortex Generator Configurations on an Ahmed Body Subjected to Yaw Angles. Journal of the Brazilian Society of Mechanical Sciences and Engineering, 43 (3), p. 131.

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    We evaluate the aerodynamic performance of several passive vortex generators (VGs) placed on a standard Ahmed body, with a slant angle (α=35º), subjected to different yawing angles (β) using RANS based models. Rigorous validation of the numerical results is performed with previously published experimental data for (β≤8º) for the Ahmed body. Our model results depict a good overall agreement with several experimental data sets. An array of different vortex generators such as the delta-winglet (DVGs), the cylindrical (CVGs) and trapezoidal (TVGs) types are introduced on to the validated model. The introduction of CVGs and DVGs tend to have a beneficial aerodynamic performance for (β=0º). In contrast, the TVGs tends to impair the performance by producing massive flow separation over the slant for (β=0º). Conversely, for (β>0º), a swift transition happens with TVGs wherein, the high energy streamwise vortices that are produced tends to improve the pressure footprint and thereby reducing the overall drag. A deterioration in the performance of DVGs is predicted during (β>4º) wherein, the 'c'-pillar vortex on the leeward side interferes with the streamwise vortical structure which adversely influences the flow over the roof-slant edge. Overall, a maximum of ~8.5% and ~7.7% drag reduction appears to be possible with the designed CVGs and TVGs at smaller vehicle yawing conditions.

    Item Type: Article
    Uncontrolled Keywords: Industrial Engineering & Automation
    Identification Number:
    Page Range: p. 131
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 25 Jan 2021 15:34
    Last Modified: 17 Mar 2021 15:02

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