Description
Recent market trends in the cruise industry aim to provide traditionally land-based attractions on cruise liners. This leads to the integration of special architectural features, such as water parks and amusement rides, in way of the cruise ships’ upper decks. Deck amusements are lightweight structures that comprise of slender beams to reduce the added weight on top decks. To ensure safety it is critical to understand the influence of wind loading introduced by Vortex-Induced Vibrations (VIVs) on their dynamic structural response.This paper presents some preliminary results on the differences between one- and two-way coupled Fluid-Structure Interaction (FSI) analyses in the context of ship deck outfitting subjected to VIVs. Accordingly, a mega deck amusement structure is idealised as an aluminum portal frame, subject to a constant head wind. Transient one- and two-way coupled FSI simulations, based on Reynolds-Averaged Navier-Stokes (RANS) fluid dynamics model and linear elastic 3D FEA, are conducted using the commercial CFD software STAR-CCM+. Results are assessed and compared against quasi-static and quasi-dynamic beam element idealisations solved by NX Nastran.
The investigation carried out reveals that vortex shedding remains at the original shedding frequency in the one-way coupled solutions. However, the two-way coupled simulation demonstrates a clear lock-in of the vortex shedding to the portal frame’s natural frequency. Consequently, the dynamic loading experienced by the portal frame is significantly increased and the structure experiences resonant vibration when full two-way FSI coupling is considered. Neither the one-way coupled nor the quasi-dynamic analysis are able to capture these effects.
| Period | 24 Sept 2019 |
|---|---|
| Held at | University of Turku, Finland |
| Degree of Recognition | International |
Keywords
- Fluid-Structure Interaction
- Vortex-Induced Vibration
- FEA
- CFD