Numerical approach on drag reduction for automotive vehicles

Mateus Brizotti, Patrick Rambaud and Florian Visentin

Table of contents

    Our 3D mesh with 600,000 cells is fine enough to capture the longitudinal vortex with good results compared with experimental values. We did simulations with and without the blowing control system for different velocity inlet and blowing velocity.
    We notice a good drag reduction when the blowing velocity is equal to the velocity inlet. This drag reduction varies with respect to the velocity of the flow around the car and the maximun drag reduction value that we got is about 6% which involves an efficiency of 1.8 (for a velocity inlet of 20 m/s and 50 m/s).
     The results that we get with the blowing velocity equal to twice the velocity inlet are not what we expected because depending on the blowing velocity, the drag is sometimes slightly increased and sometimes slightly decreased. Thus we advice to change the angle of the blowing system depending on the velocity used to burst the vortices.

We would like to thank the following people for their help to the project :

  - M. Kourta and all the teachers staff of ENSEEIHT
          - M. Alexei Stoukov for his precious help whenever we had computing problems

  - Thanks to the hydraulic department at ENSEEIHT

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