A Numerical Study Of Oscillating Sub-Boundary Layer Vortex Generators Application
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Date
2011-06
Authors
Zulkefli, Nur Faraihan
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
A numerical simulation for oscillating sub-boundary layer vortex generator
(SBVG) with Co-rotating (Co) and Counter-Rotating (Co-R) configurations was carried
out. The device was attached and tested on a flat plate with zero- pressure gradient
condition. This three-dimensional (3D) simulation adopted a fully turbulent flow, having
a Reynolds number of 1x106. The Reynolds-averaged Navier-Stokes (RANS) equations
with the SST k- turbulence model were used to predict the flow field which employed
hybrid mesh. The SBVG was oscillated in a sinusoidal motion between 180 and -180.
The results show that the profile for Counter-Rotating (Co-R) SBVG was more
dominant due to its strong vortices compared to co-rotating.
A two-element high-lift configuration with oscillating SBVG attached at the
leading edge of the flap was simulated based on the RANS equations with SST k-
turbulence model. Four different reduced frequencies with Reynolds numbers of 8.4x105
were studied. The effect of oscillating SBVG motion in the range of 180 and -180 on
aerodynamic coefficients was investigated. The results show that the vortex formation
on the flap surface was almost invisible when the reduced frequency was increased. The
oscillating SBVGs produce higher lift coefficient and drag coefficient, however the liftto-
drag ratio was almost the same as the static SBVG.
Description
Keywords
A numerical simulation for oscillating , sub-boundary layer vortex generator