Characterizations of force and pressure fluctuations on real vehicles - ENSTA Paris - École nationale supérieure de techniques avancées Paris Access content directly
Journal Articles International Journal of Engineering Systems Modelling and Simulation Year : 2016

Characterizations of force and pressure fluctuations on real vehicles

Abstract

Both the unsteady aerodynamics force and base pressure distributions are investigated for four model cars in real flow conditions. The low pass cutoff frequency of the measurements is about 5 Hz which is sufficient to consider the global fluctuations of drag, lift and side forces. The drag fluctuations are very low, they never exceed 1% of the mean drag. A clear correlation is found with the base pressure distribution fluctuations. It is found that the regions of smallest pressure fluctuations on the vehicle base are the most correlated to the drag fluctuations or in other words, the regions of largest pressure fluctuations on the base are not associated with the drag fluctuations. Sideslip effect is studied, and one of the model presented a clear bistable behavior on the lift creating huge fluctuations as investigated in the academic experiment of Grandemange, Gohlke and Cadot, Physics of Fluids 25 (2013) 095103.
Fichier principal
Vignette du fichier
CNRT_unsteady_car_models.pdf (4.51 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-01249013 , version 1 (29-12-2015)

Identifiers

  • HAL Id : hal-01249013 , version 1

Cite

Olivier Cadot, A Courbois, D Ricot, Tony Ruiz, F Harambat, et al.. Characterizations of force and pressure fluctuations on real vehicles. International Journal of Engineering Systems Modelling and Simulation, 2016, 8 (2), pp.99-105. ⟨hal-01249013⟩
65 View
256 Download

Share

Gmail Facebook Twitter LinkedIn More