High speed driving stability of road vehicles under crosswinds: an aerodynamic and vehicle dynamic parametric sensitivity analysis

Crosswinds affect vehicle driving stability and their influence increase with speed. To improve high speed stability, interdisciplinary research using unsteady aerodynamics dynamics is necessary. The current demands of faster development times require robust virtual methods for assessing performance in early design phases. This paper employs a numerical one-way coupling between the two disciplines uses variety realistic crosswind gust profiles aerodynamic simulations to output representative forces moments on three dynamic models different fidelity levels, ranging from one-track model full multi-body sports utility vehicle. An investigation required was conducted along sensitivity study find key characteristics minimise yaw velocity lateral acceleration response during crosswinds. Transient were used gusts at speeds. Analysis showed that rapid changing generate overshoots moment, due phase delay flow front rear A methodology modelling this proposed. captured equally well by enhanced (mid-level fidelity) model, while simplest failed emulate correct response. importance positioning centre gravity, coefficient wheel base, mass inertia. In addition, axles' side force steer gradients other suspension parameters revealed potential improving stability.