Hot-wire measurements on the Ahmed body turbulent wake in a low-speed wind tunnel

ADRIÁN R. WITTWER, DR., ING. MECÁNICO.; BEATRIZ ITURRI; JUAN MANUEL RODRIGUES AGUIRRE; HUGO G. CASTRO; MARCELO I. ADOTTI; JORGE O. MARIGHETTI, MGTR., ING. MECÁNICO.; MARIO E. DE BORTOLI

Blumenau- Santa Catarina

Congreso; EPTT 2022 13th Spring School on Transition and Turbulence; 2022

ABCM -Associação Brasileira de Engenharia e Ciências Mecânicas

The Ahmed body is a standard model proposed for the study of road vehicles, serving as a reference point forcalibrating wind tunnels, computer codes, and for extrapolating results for design or industrial purposes. Even thoughthe model is a simple geometry, it reproduces the turbulent flow of the wake, boundary layer separations and flow reentries, in a similar way to those found in real ground vehicles. Particularly, the study of turbulent wakes is of interest toevaluate possible effects of instability due to dynamic loads introduced by the wind, aiming to reduce fuel consumption.In this paper, measurements of the Ahmed body?s wake are reported. The experiments have been carried out in thewind tunnel ?Jacek Gorecki? of the Universidad Nacional del Nordeste (UNNE), Argentina. The measurements wereperformed with a DANTEC hot wire anemometer. A previous calibration of a single probe was carried out within therange of speed measurements, and then time velocity series were obtained at the wake turbulent flow. The preliminarymean velocity results are evaluated and compared with a Laser Doppler Anemometry (LDA) experiment from specificliterature. Spectral analysis of the velocity fluctuations for relevant measurement points is also presented.