Author(s)

M. Moreira, H. Pina and J. Antunes

Abstract

This paper is concerned about vertical rotors immersed in fluid annulus of mod- erate confinement. Such rotors are subjected to the dynamical effects of the fluc- tuating co-rotating flows. For high enough spinning velocities, the fluid-elastic forces become significant, and often lead to unstable dynamical regimes. These depend on the fluid gap and density, on the rotor eccentricity and spinning velocity, as well as structural properties. We developed an improved linear model for rotors under moderate fluid con- finement as well as an exact model for the corresponding nonlinear rotor dynamics. Recently a symbolic-numerical formulation based on a spectral/Galerkin approach was also developed by the authors. Numerical resul

Keywords