Direct numerical simulations have been performed to study the flow around
a high-lift turbine blade for low and high levels of turbulence intensity. Initially a two-dimensional simulation has been carried out to study the dominant two-dimensional physics. The chord Reynolds number is approximately
Re = 45000. Moreover, three-dimensional simulations are conducted using two
sets of low and high level background noise mimicking the effect of free stream
turbulence. For both cases the response of the boundary layer to external
perturbations is manifested as streaky structures on the suction side and　　　　　　　　　　　　 longitudinal　structures on the pressure side.