The vortex structure behind an Ahmed reference model in the presence of a moving ground plane

The vortex structure behind an Ahmed reference model in the presence of a moving ground plane Laser Doppler anemometry (LDA) data are presented for an Ahmed reference model employing various backlight angles. LDA velocity measurements are taken in a number of planes around and downstream of the model at a free-stream velocity of 25 m s−1. During the testing a rolling road provided ground simulation and six-component force data were recorded. Data from these experiments are compared to previous experimental data. It is found that the inclusion of the ground simulation and the consequent supporting strut produces a reduction in the size and strength of the vortices shed from the back end of the Ahmed model when compared with previous analysis. It is further concluded this effect is primarily a result of the overhead strut, and that the rolling road has little effect on these upper vortices. In addition, vortices shed from the underside of the model, not reported in previous experimental work, are found and analysed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

The vortex structure behind an Ahmed reference model in the presence of a moving ground plane

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Publisher
Springer Journals
Copyright
Copyright © 2007 by Springer-Verlag
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-007-0270-x
Publisher site
See Article on Publisher Site

Abstract

Laser Doppler anemometry (LDA) data are presented for an Ahmed reference model employing various backlight angles. LDA velocity measurements are taken in a number of planes around and downstream of the model at a free-stream velocity of 25 m s−1. During the testing a rolling road provided ground simulation and six-component force data were recorded. Data from these experiments are compared to previous experimental data. It is found that the inclusion of the ground simulation and the consequent supporting strut produces a reduction in the size and strength of the vortices shed from the back end of the Ahmed model when compared with previous analysis. It is further concluded this effect is primarily a result of the overhead strut, and that the rolling road has little effect on these upper vortices. In addition, vortices shed from the underside of the model, not reported in previous experimental work, are found and analysed.

Journal

Experiments in FluidsSpringer Journals

Published: Feb 28, 2007

References

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