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Detached-Eddy Simulations of Active Flow Control Systems on a Simplified Car Geometry
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Aerodynamics.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The feasibility of implementing an active flow control system in ground vehicles is investigated through detached-eddy simulations of the Windsor model. This is done in the open-source CFD code OpenFOAM. Forcing is done with a zero-net-mass-flux actuator, which is modeled as a sinusoidal velocity boundary condition through slots located at the rear edge of the roof. Simulations are done in three steps: 2D, semi-3D and 3D, to give an understanding of different flow phenomena, and a parameter study is performed. Results show that drag can be reduced mainly by reducing the strength of the vortex shedding process, with a gradual decrease in effectiveness from 2D to 3D. A small drag reduction is achieved in semi-3D, and a lift reduction is achieved in 3D. DES methodology is shown to work well when simulating active flow control.

Place, publisher, year, edition, pages
2012. , 84 p.
Trita-AVE, ISSN 1651-7660 ; 2012:18
National Category
Aerospace Engineering
URN: urn:nbn:se:kth:diva-100807OAI: diva2:545053
Available from: 2012-09-05 Created: 2012-08-17 Last updated: 2012-09-05Bibliographically approved

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