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LES Investigation of Passive Flow Control Around an Ahmed Body

Sinisa Krajnovic (Institutionen för tillämpad mekanik, Strömningslära)
Proceedings of the ASME 2013 International Mechanical Engineering Congress & Exposition IMECE 2013 November 15-21, 2013, San Diego, CA, USA p. V07AT08A010. (2013)
[Konferensbidrag, refereegranskat]

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

Nyckelord: LES, large-eddy simulation, Ahmed body, flow control, vehicle aerodynamics



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Denna post skapades 2014-04-03. Senast ändrad 2015-09-18.
CPL Pubid: 196178