Nonlinear Rotor Wake/Stator Interaction Computations

Övrigt konferensbidrag, 2007

Rotor wake interactions with stators is an important aspect in turbomachinery noise generation. This paper deals with the time lagged periodic boundary condition (chorochronic periodicity) used in time domain Navier-Stokes equations solvers. The time lag periodic b.c. is used to solve the nonlinear three dimensional N-S equations using realizable k-epsilon turbulence model and time dependent wake defined at the inlet, with only a limited number of blade passages discretized. The time lag periodic b.c. has been validated through a number of 3D test cases. It has been shown that the use of a periodic/temporal damping term is an efficient way to stabilize the time lagged boundary condition without adding any extra spatial dissipation to the computation. The acoustic response from a stator vane with wakes defined at the inlet is presented.