A LES study of a modified Ahmed body geometry

Minelli, Guglielmo (2012) A LES study of a modified Ahmed body geometry. [Laurea magistrale], Università di Bologna, Corso di Studio in Ingegneria aerospaziale [LM-DM270] - Forli', Documento ad accesso riservato.
Documenti full-text disponibili:
[img] Documento PDF
Full-text non accessibile

Download (8MB) | Contatta l'autore


A numerical study using Large Eddy Simulation Coherent Structure Model (LES-CSM), of the flow around a simplified Ahmed body, has been done in this work of thesis. The models used are two salient geometries from the experimental investigation performed in [1], and consist, in particular, in two notch-back body geometries. Six simulation are carried out in total, changing Reynolds number and back-light angle of the model’s rear part. The Reynolds numbers used, based on the height of the models and the free stream velocity, are Re = 10000, Re = 30000 and Re = 50000. The back-light angles of the slanted surface with respect to the horizontal roof surface, that characterizes the vehicle, are taken as B = 31.8◦ and B = 42◦ respectively. The experimental results in [1] have shown that, depending on the parameter B, asymmetric and symmetric averaged flow over the back-light and in the wake for a symmetric geometry can be observed. The aims of the present work of master thesis are principally two. The first aim is to investigate and confirm the influence of the parameter B on the presence of the asymmetry of the averaged flow, and confirm the features described in the experimental results. The second important aspect is to investigate and observe the influence of the second variable, the Reynolds number, in the developing of the asymmetric flow itself. The results have shown the presence of the mentioned asymmetry as well as an influence of the Reynolds number on it.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Minelli, Guglielmo
Relatore della tesi
Correlatore della tesi
Corso di studio
Ordinamento Cds
Parole chiave
CFD, LES, Ahmed body, Notch-back, Bluff body flow, Vehicle aerodynamics, Asymmetric averaged flow, Asymmetry.
Data di discussione della Tesi
20 Dicembre 2012

Altri metadati

Gestione del documento: Visualizza il documento