From an experimental investigation of a notchback car near-wake, a new topological structure for the wake is proposed. Although experiments were only conducted on notchback vehicles, the topology can be related to other car shapes. The unsteady behavior of the near-wake was investigated. The near-wake frequencies, which can affect ride and steering comfort, were found to be 0.11U∞/xR and 0.42U∞/xR (xR - reattachment length). The lower frequency appears to be a result of large scale vortex shedding ('hairpin' vortex) behind the backlight/rear-window. The higher frequency can be attributed to the shear-layer vortices.
|Publication status||Published - 1 Dec 2001|
|Event||SAE World Congress 2001 - Detroit, United States of America|
Duration: 5 Mar 2001 → 8 Mar 2001
|Conference||SAE World Congress 2001|
|Abbreviated title||SAE 2001|
|Country||United States of America|
|Period||5/03/01 → 8/03/01|