Abstract: A disturbance vortex method for simulating unsteady rotor/stator interaction in turbomachinery is presented in this paper. The basic idea of the method is that the numerical steady solutions in the relative frame for rotor and absolute frame for stator are taken as input, which can give an initial description of the unsteady disturbance flow field. To calculate the unsteady response to these disturbances, the algorithm utilizes the Lagrangian vortex method (to trace the trajectories of vortices directly) t...