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Published in:
01-06-2015 | Research Article
The effect of aspect ratio on the wake of the Ahmed body
Published in: Experiments in Fluids | Issue 6/2015
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Abstract
This paper seeks to further elucidate the wake of the
Ahmed body by investigating how the time-averaged flow structures vary with frontal aspect ratio. High-resolution particle image velocimetry results are provided for eight different width Ahmed geometries at \(\text {Re}_{\sqrt{FA}}=3\times 10^4\). It is shown that the narrower the body,
the greater the downwash over the back slant, meaning the flow remains more attached. At a critical aspect ratio (
\(=1.9\)), the flow downstream changes. The separation over the back slant is shown to be affected by the
, and this in turn has a significant effect on the
circulation in the c-pillar vortices.
\(=1.9\)), the flow downstream changes. The separation over the back slant is shown to be affected by the
, and this in turn has a significant effect on the
circulation in the c-pillar vortices.