Modal analysis and flow control for drag reduction on a Sport Utility Vehicle

Abstract : The automotive industry dedicates a lot of effort to improve the aerodynamical performances of road vehicles in order to reduce its carbon footprint. In this context, the target of the present work is to analyze the origin of aerodynamic losses on a reduced scale generic Sport Utility Vehicle and to achieve a drag reduction using an active flow control strategy. After an experimental characterization of the flow past the POSUV, a cross-modal DMD analysis is used to identify the correlated periodical features responsible for the tailgate pressure loss. Thanks to a genetic algorithm procedure, 20% gain on the tailgate pressure is obtained with optimal pulsed blowing jets on the rear bumper. The same cross-modal methodology allows to improve our understanding of the actuation mechanism. After a preliminary study of the 25° inclined ramp and of the Ahmed Body computations, the numerical simulation of the POSUV is corroborated with experiments using the cross-modal method. Deeper investigations on the three-dimensional flow characteristics explain more accurately the wake flow behavior. Finally, the controlled flow simulations propose additional insights on the actuation mechanisms allowing to reduce the aerodynamic losses.
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Submitted on : Thursday, June 27, 2019 - 4:00:09 PM
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Stéphie Edwige. Modal analysis and flow control for drag reduction on a Sport Utility Vehicle. Mechanics [physics.med-ph]. Conservatoire national des arts et metiers - CNAM, 2019. English. ⟨NNT : 2019CNAM1233⟩. ⟨tel-02167243⟩

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