Computational analysis for optimal location of open sunroof for an SUV with ahmed body profile

The sunroof has become a much sought-after feature in Sports Utility Vehicles (SUVs). However, opening the sunroof of the SUV modifies the streamlined profile of the SUV and adversely affects the aerodynamics both inside and outside of the vehicle. This leads to increased drag (or air resistance) on the SUV, and can also induce flow disturbances inside the cabin. Here, it is proposed to examine the aerodynamics of an SUV modeled with the simple profile of an Ahmed body, but with an open sunroof. The primary objective of this study is to examine the velocity field of air inside the cabin, and the drag on the SUV, when its sunroof is opened. Using the CFD package-ANSYS Fluent-this work assesses the velocity contours and drag coefficient for three locations of the sunroof – above the driver, middle of the roof, and above the rear passengers. The results from this study can help the automotive industry in improving the aerodynamic designs for SUVs with sunroof.