A nonlinear model for the fluid-coupled vibrations of  spent nuclear racks

Moreira, Miguel; Antunes, J.

http://hdl.handle.net/10400.26/4580

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Authors

Moreira, Miguel

Antunes, J.

Abstract(s)

In the near-past we introduced a simplified linearized model for the fluid-coupled vibratory responses of nuclear fuel racks, neglecting three-dimensional flow effects and assuming small gaps between the fuel assemblies. In this paper, using the same basic approach, we generalize the above-mentioned model to account for nonlinear squeeze-film and dissipative flow effects. The proposed methodology can be automatically implemented on a symbolic computer environment. Numerical simulations highlight the significance of nonlinear flow effects at high vibration amplitudes, yielding more realistic predictions.