Study of active flow control for a simplified vehicle model using the PANS method
Journal article, 2013

Flow control has shown a potential in reducing the drag in vehicle aerodynamics. The present numerical study deals with active flow control for a quasi-2D simplified vehicle model using a synthetic jet (zero net mass flux jet). Recently developed near-wall Partially-Averaged Navier–Stokes (PANS) method, based on the ζ–f RANS turbulence model, is used. The aim is to validate the performance of this new method for the complex flow control problem. Results are compared with previous studies using LES and experiments, including global flow parameters of Strouhal number, drag coefficients and velocity profiles. The PANS method predicts a drag reduction of approximately 15%, which is closer to the experimental data than the previous LES results. The velocity profiles predicted by the PANS method agree well with LES results and experimental data for both natural and controlled cases. The PANS prediction showed that the near-wake region is locked-on due to the synthetic jet, and the shear layer instabilities are thus depressed which resulted in an elongated wake region and reduced drag. It demonstrates that the PANS method is able to predict the flow control problem well and is thus appropriate for flow control studies.

Drag reduction

Active flow control

Vehicle aerodynamics

PANS method

Hybrid method

Author

Xingsi Han

Chalmers, Applied Mechanics, Fluid Dynamics

Sinisa Krajnovic

Chalmers, Applied Mechanics, Fluid Dynamics

B. Basara

AVL

International Journal of Heat and Fluid Flow

0142-727X (ISSN)

Vol. 42 139-150

Driving Forces

Sustainable development

Areas of Advance

Transport

Building Futures

Energy

Subject Categories

Energy Engineering

Other Physics Topics

Vehicle Engineering

Fluid Mechanics and Acoustics

Roots

Basic sciences

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1016/j.ijheatfluidflow.2013.02.001