Time averaged and unsteady near-wake analysis of cars

Brendan R. Gilhome; Jeffrey W. Saunders; John Sheridan

doi:10.4271/2001-01-1040

Time averaged and unsteady near-wake analysis of cars

Brendan R. Gilhome, Jeffrey W. Saunders, John Sheridan

Mechanical & Aerospace Engineering

Research output: Contribution to conference › Paper › peer-review

23 Citations (Scopus)

Abstract

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∞/x_R and 0.42U∞/x_R (x_R - 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.

Original language	English
DOIs	https://doi.org/10.4271/2001-01-1040
Publication status	Published - 1 Dec 2001
Event	SAE World Congress 2001 - Detroit, United States of America Duration: 5 Mar 2001 → 8 Mar 2001

Conference

Conference	SAE World Congress 2001
Abbreviated title	SAE 2001
Country/Territory	United States of America
City	Detroit
Period	5/03/01 → 8/03/01

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10.4271/2001-01-1040

Cite this

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abstract = "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.",

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AU - Saunders, Jeffrey W.

AU - Sheridan, John

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N2 - 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.

AB - 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.

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M3 - Paper

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Y2 - 5 March 2001 through 8 March 2001

ER -

Time averaged and unsteady near-wake analysis of cars

Abstract

Conference

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