Numerical Investigation of the Actuated Flow on a Bluff Body
Paper in proceedings, 2015

Large Eddy Simulations (LES) are conducted to study the Active Flow Control (AFC) of the separation of the boundary layer on a rounded leading edge frontstep. This bluff body imitates the flow around a section of a simplified truck cabin and focuses on the separation arising at the front rounded corner, the so called A-pillar. The LES data show the connection between the actuation and drag reduction. The actuated and unactuated flows are analysed using modal decomposition and frequency analysis. Different configurations are tested and a strong influence of the actuation on both drag reduction and separation mechanism was observed. Relevant results, in terms of drag coefficient and recirculation bubble reduction, are achieved when the flow is actuated. LES shows an increased unsteadiness in the flow, introduced by the actuation. An analysis that investigates the connection between actuation and induced unsteadiness is presented.


Guglielmo Minelli

Chalmers, Applied Mechanics, Fluid Dynamics

Sinisa Krajnovic

Chalmers, Applied Mechanics, Fluid Dynamics

5th International Conference on Jets, Wakes and Separated Flows, ICJWSF2015, Stockholm, Sweden, 15-18 June 2015

1867-4941 (eISSN)

Vol. 185 295-302

Areas of Advance



Subject Categories

Vehicle Engineering

Fluid Mechanics and Acoustics