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LES Investigation of Passive Flow Control Around an Ahmed Body

[+] Author Affiliations
Siniša Krajnović

Chalmers University of Technology, Gothenburg, Sweden

Paper No. IMECE2013-62373, pp. V07AT08A010; 12 pages
doi:10.1115/IMECE2013-62373
From:
  • ASME 2013 International Mechanical Engineering Congress and Exposition
  • Volume 7A: Fluids Engineering Systems and Technologies
  • San Diego, California, USA, November 15–21, 2013
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5631-4
  • Copyright © 2013 by ASME

abstract

Large eddy simulations are used to study passive flow control for drag reduction in a simplified ground vehicle. Add on devices in the form of short cylinders are used for the formation of streaks in the streamwise direction that lead to the separation delay. The results of the present numerical simulations are compared with the experimental data and show good agreement. The two-stage flow control mechanism is analyzed from the LES results. It was found to be in agreement with the previous experimental observations that the counter-rotating vortices behind the impinging devices influence the separation only indirectly through the longitudinal vortices further downstream.

Copyright © 2013 by ASME
Topics: Flow control

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