Characterisation of the Tyre Spray Ejected Downstream of a Bluff Automotive Body

<div class="section abstract"><div class="htmlview paragraph">Considerations of surface contamination and airborne spray are becoming increasingly significant throughout the automotive design process. Advanced driver assistance systems, such as autonomous cruise control, growing in popularity. These systems rely on external sensors, performance which may be impaired by both direct obstruction spray. Existing experimental methods assessing front-end wiper have typically utilised fixed spray-grids positioned upstream vehicle. The resulting is largely steady nature, contrast to unsteady flow-field tyre that would produced preceding vehicles. This paper presents numerical analysis ejected downstream a simplified body. continuous phase (air) solved using DDES-based approach coupled with Lagrangian representation dispersed (water). Two configurations examined, square-back configuration variation employing 20° rear-end side tapers. inclusion tapering results change wake topology cloud. Good agreement achieved between initial single-phase predictions existing data. cloud found highly unsteady, driven vortical structures near- far-wake, altered significantly what relatively minor changes geometry. Proper Orthogonal Decomposition reveals comparable spatial modes mass flux field velocity However, correlation temporal coefficients these weak. highlights presence slip effects two phases, coming result particle inertia, need consider phases simultaneously future studies dynamics.</div></div>