A test case for large-eddy simulation in vehicle aerodynamics

The flow around a simplified bus was computed using large-eddy simulation with intention to gain better understanding of this flow and to make a data base for validation of RANS and hybrid RANS-LES simulations. Transient quantities such as dominated frequencies and variance were studied as well as mean quantities. Velocity and pressure results were compared with the experimental data. Coherent structures were visualized and their positions were determined. Mean Reynolds stresses were computed and it was found that the largest resolved turbulent kinetic energy was in the recirculating flow close to the leading edges and in the lower part of the wake