Computational and experimental investigations of the vortical flow structures in the near wake region downstream of the Ahmed vehicle model
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Tarih
2016
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The present study aims to investigate flow characteristics downstream of the Ahmed vehicle model using both experimental and computational methods. Ahmed vehicle model having 1/4 scale and 25 slant angle is employed at Reynolds number of Re-H=1.48x10(4). Investigations are conducted in two parts. In the first part, Large Eddy Simulation (LES) method is used to resolve the flow structures downstream of the Ahmed model, computationally. In the second part, the technique of the particle image velocimetry (PIV) is employed to obtain the flow fields downstream of the Ahmed model. The PIV and LES investigations provides time-averaged and instantaneous velocity field results, such as vorticity contours, streamline topology, velocity profiles and spectral analysis of the flow velocity. Flow features that have been predicted by computational study are in a good harmony with the results predicted by experimental studies both on the slanted surface and in the near wake region downstream of the Ahmed model. Results present that characteristics of flow features that exist on the rear slanted surface and in the near wake region of the Ahmed model exhibit great variations in a very short distance in both stream-wise and vertical direction of the flow.
Açıklama
Anahtar Kelimeler
Ahmed vehicle model, LES, PIV, Spectral analysis, Wake flow
Kaynak
Journal of Wind Engineering and Industrial Aerodynamics
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
159
