Title: Fluid Structure Interaction of a Rotating Automotive Wheel in contact with the ground using a weakly-coupled overset approach
A computational study of an isolated rotating wheel is performed with both steady and unsteady
Reynolds Averaged Navier-Stokes (RANS) in STAR-CCM+. Implicit coupled flow solver for
conservation equations with k− Realizable turbulence model is applied upon Fackrell A2 wheel
geometry . Flow conditions are equally reproduced in order to validate obtained results.
Contact and rotating models applied on this case have shown clear limitations so far, hence the
main objective of this research project is to implement a more accurate approach. An innovative
Zero Gap Overset interface available in STAR-CCM+ brings the possibility to simulate a
realistic rotation with a small enclosure around the contact (see Figure 1).
(a) Background domain. (b) Overset domain.
Figure 1: Overset cell status representation at central plane close to the contact with the ground. Inactive
cells are highlighted in red (1), active cells in yellow (0) and overlapping in blue (-2).
Good overall agreement is found with steady RANS, followed by a time dependent simulation
that better captures expected flow features. Excellent drag prediction is obtained while lift is
underpredicted compared to experimental data . Pressure distribution shows a successful
suction peak prediction after the contact patch not captured by experimental data and sooner
flow separation upstream on the top of the wheel. Interesting transversal vortex after the
contact patch is identified only when the overset rotating boundary condition is applied, plus
a greatly captured jetting phenomena (see Figure 2).
In parallel, tyre deformation under vertical load and inflation pressure is solved for linear elastic
and multi-layer hyperelastic material in ABAQUS based on numerical and experimental data
from Yang . Good agreement is obtained with respect to tyre deformation and contact
adaptation to the ground (see Figure 3).