Assessment of single passage simulations for the aeroelastic stability of a multistage centrifugal compressor

In this paper, the aeroelastic flutter stability of an impeller is investigated numerically with single passage and full annulus URANS simulations carried out on one side a stage configuration including strut other multistage in which two additional diffusers are considered downstream. The robustness relying use multiple frequency phase-lagged boundary conditions put to test especially case for both blade effects have be taken into account. Comparisons between configurations indicate that impeller-diffuser interaction acts locally fluid-structure interface has only little effect generalized aerodynamic forces. Full also been assess accuracy efficiency introduce hypotheses periodicity flow. competitive terms wall clock since convergence periodic state faster than involving Fourier approximation flow field.