Guidelines for SUV Bodywork Design Focused on Aerodynamic Drag Reduction Using the Generic AeroSUV Model

Barrera, David; Guzman, Arturo

doi:10.4271/2020-01-0478

Cited by 3 publications

References 10 publications

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Further Analysis of the Blockage Phenomenon during the Testing of Bluff Automotive Bodies in Closed Wall Wind Tunnels

Riegel¹

2022

SAE Int. J. Adv. & Curr. Prac. in Mobility

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<div class="section abstract"><div class="htmlview paragraph">The difficulties of testing a bluff automotive body of sufficient scale to match the on-road vehicle Reynolds number in a closed wall wind tunnel has led to many approaches being taken to adjust the resulting data for the inherent interference effects. But it has been impractical if not impossible to experimentally analyze the effects that are occurring on and around the vehicle when these blockage interferences are taking place. The present study is an extension of earlier work by the author and similarly to that study uses the CFD (computational fluid dynamics) analysis of several bodies of differing configurations to examine the interference phenomena in solid wall wind tunnels and the effects that they have on the pressures, forces and force increments experienced by the vehicle model. This is accomplished by executing a series of CFD configurations with varying sized cross sections from 0.2% to 13% blockage enabling an approximation of free air conditions as a reference. The earlier work is extended by using additional body configurations which include reference bodies from the Technical University of Munich, the University of Stuttgart, and Ford Motor Company to complement the simple shapes used in that study along with the use of a SAE Notchback model simple shape. Examination is made of the physical phenomena occurring around the vehicle as the proximity to the walls and ceiling is changed holding the test section aspect ratio and length constant. Static Pressure distortions, skin friction changes, velocity distortions and the distribution of forces on the vehicle body are examined. It is intended that this dataset be used by the SAE Road Vehicle Aerodynamics Forum Committee (RVAC) and the Subsonic Aerodynamic Testing Association combined activity, Commonized Automotive Aerodynamic Test Standards, or CAATS, to evaluate and/or develop wind tunnel blockage techniques for automotive bluff bodies.</div></div>

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Further Analysis of the Blockage Phenomenon during the Testing of Bluff Automotive Bodies in Closed Wall Wind Tunnels

Riegel¹

2022

SAE Int. J. Adv. & Curr. Prac. in Mobility

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Further Analysis of the Blockage Phenomenon during the Testing of Bluff Automotive Bodies in Closed Wall Wind Tunnels – Revised and Updated

Gleason,

Riegel

2024

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">The difficulties of testing a bluff automotive body of sufficient scale to match the on-road vehicle Reynolds number in a closed wall wind tunnel has led to many approaches being taken to adjust the resulting data for the inherent interference effects. But it has been impractical if not impossible to experimentally analyze the effects that are occurring on and around the vehicle when these blockage interferences are taking place. The present study is an extension of earlier work by the author and similarly to that study uses the CFD (computational fluid dynamics) analysis of several bodies of differing configurations to examine the interference phenomena in solid wall wind tunnels and the effects that they have on the pressures, forces and force increments experienced by the vehicle model. This is accomplished by executing a series of CFD configurations with varying sized cross sections from 0.2% to 16% blockage enabling an approximation of free air conditions as a reference. The earlier work is extended by using additional body configurations which include reference bodies from the Technical University of Munich, the University of Stuttgart, and Ford Motor Company to complement the simple shapes used in that study along with the use of a SAE Notchback model simple shape and a newly generated Utility Van configuration utilizing chassis components from the Ford GTU pickup. Examination is made of the physical phenomena occurring around the vehicle as the proximity to the walls and ceiling is changed holding the test section aspect ratio and length constant. Static Pressure distortions, skin friction changes, velocity distortions and the distribution of forces on the vehicle body are examined. It is intended that this dataset be used by the SAE Road Vehicle Aerodynamics Forum Committee (RVAC) and the Subsonic Aerodynamic Testing Association combined activity, Commonized Automotive Aerodynamic Test Standards, or CAATS, to evaluate and/or develop wind tunnel blockage techniques for automotive bluff bodies. The report has corrected errors contained in the original paper while revising and updating it.</div></div>

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The Aerodynamic Development of the New BREZZA and FRONX

Dey,

Bajpai,

Kumar

et al. 2024

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">MSIL (Maruti Suzuki India Limited), India’s leading carmaker, has various SUVs (Sports Utility Vehicle) in its model lineup. Traditionally, SUVs are considered to have a bold on-road presence and this bold design language often deteriorates aerodynamic drag performance. Over the years, the demand for this segment has significantly grown, whereas the CAFE (Corporate Average Fuel Economy) norms have become more stringent. To cater this growing market demand, MSIL planned for two new SUVs: (1) New BREZZA - A bolder design with similar targeted aerodynamic performance compared to its predecessor (BREZZA-2016) and (2) FRONX - A new cross-over SUV vehicle targeted best-in-class aerodynamic performance in this category at MSIL. This paper illustrates the aerodynamic development process for these two SUVs using CFD (Computational Fluid Dynamics) and full scale WTT (Wind Tunnel Test). During the initial stages, the bolder design of the New BREZZA (2022) deteriorated the aerodynamic drag of the vehicle. Styling exterior surface modifications and addition of new aero parts facilitated the recovery of aerodynamic drag performance. The front & rear bumper corners, roof end spoiler profile, rear quarter glass edging, slits on fender lining and air-dam on rear bumper helped in air flow attachment. In FRONX, the styling design language had been created by considering ambitious aerodynamic performance requirements. The aerodynamic silhouette consisting of hood-windshield transition, roof lining, optimized backdoor spoiler, side body profile etc. along with underbody aero-parts like underbody covers, strakes and central air-dam improved the aerodynamic efficiency in FRONX by 11% with respect to base model BREZZA-2016. To achieve this improvement in aerodynamic drag values, major technical counter measures in external shape and addition of aero parts while retaining the SUV styling image were done. This paper illustrates how these changes were realized in the aerodynamic development process and the corresponding air flow phenomenon.</div></div>

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Guidelines for SUV Bodywork Design Focused on Aerodynamic Drag Reduction Using the Generic AeroSUV Model

Cited by 3 publications

References 10 publications

Further Analysis of the Blockage Phenomenon during the Testing of Bluff Automotive Bodies in Closed Wall Wind Tunnels

Further Analysis of the Blockage Phenomenon during the Testing of Bluff Automotive Bodies in Closed Wall Wind Tunnels

Further Analysis of the Blockage Phenomenon during the Testing of Bluff Automotive Bodies in Closed Wall Wind Tunnels – Revised and Updated

The Aerodynamic Development of the New BREZZA and FRONX

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