An Experimental Investigation into the Flow Mechanisms Around an SUV in Open and Closed Cooling Air Conditions

  • John Pitman
  • Adrian Gaylard
Conference paper


A Range Rover SUV with the cooling apertures open and closed had a range of force, surface pressure and flow-field measurements recorded in the FKFS Aero-acoustic wind tunnel. With modern automotive aerodynamics requiring low drag in a range of operating conditions, the primary motivation was to give insight into the interacting flow mechanisms which lead to differing aerodynamic behaviours depending on the vehicle configuration. Cooling drag, the drag difference between the vehicle with open and closed cooling apertures, is used as a metric to demonstrate a set of complex flow interactions occurring on this vehicle between the front and rear wheel wakes and the base wake.



The author wishes to thank Domenik Schramm, Felix Wittmeier and Timo Kuthada at FKFS for consultation on the flow-field surveys, James Imrie and Rick Shock for supporting the experimental work, and Sebastien Chaligne for proof-reading and general consulation, and Jaguar Land Rover for the permission to publish this work.


  1. 1.
    Gaylard, A.: The Appropriate Use of CFD in the Automotive Design Process. SAE Technical Paper 2009-01-1162 (2009).
  2. 2.
    Lietz, R., Larson, L., Bachant, P., Goldstein, J., et al.: An Extensive Validation of an Open Source Based Solution for Automobile External Aerodynamics. SAE Technical Paper 2017-01-1524 (2017).
  3. 3.
    Larson, L., Gin, R., Lietz, R.: Aerodynamic investigation of cooling drag of a production sedan part 2: CFD results. SAE Int. J. Passeng. Cars Mech. Syst. 10(1), 214–223 (2017). Scholar
  4. 4.
    Lew, C., Gopalaswamy, N., Shock, R., Duncan, B. et al.: Aerodynamic Simulation of a Standalone Rotating Treaded Tire. SAE Technical Paper 2017-01-1551 (2017).
  5. 5.
    Tesch, G., Demuth, R., Adams, N.: A new approach to analyzing cooling and interference drag. SAE Int. J. Passeng. Cars Mech. Syst. 3(1), 339–351 (2010). Scholar
  6. 6.
    Blumrich, R., Widdecke, N., Wiedemann, J., Michelbach, A. et al.: New FKFS Technology at the Full-Scale Aeroacoustic Wind Tunnel of University of Stuttgart. SAE Int. J. Passeng. Cars Mech. Syst. 8(1), 294–305 (2015). Scholar
  7. 7.
    Sterken, L., Sebben, S., Walker, T., and Lofdahl, L.: Experimental and Numerical Investigations of the Base Wake on an SUV. SAE Technical Paper 2013-01-0464 (2013).
  8. 8.
    Mercker, E., Cooper, K.: A Two-Measurement Correction for the Effects of a Pressure Gradient on Automotive, Open-Jet, Wind Tunnel Measurements. SAE Technical Paper 2006-01-0568 (2006).
  9. 9.
    Cogotti, A.: A Strategy for Optimum Surveys of Passenger-Car Flow Fields. SAE Technical Paper 890374 (1989).

Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.Jaguar Land RoverWarwickUK

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