## Abstract

Currently, the interaction between free surface flow and an elastic structure is simulated with monolithic codes which calculate the deformation of the structure and the liquid-gas flow simultaneously. In this work, this interaction is calculated in a partitioned way with a separate flow solver and a separate structural solver using the interface quasi-Newton algorithm with approximation for the inverse of the Jacobian from a least-squares model (IQN-ILS). The interaction between an elastic beam and a sloshing liquid in a rolling tank is calculated and the results agree well with experimental data. Subsequently, the impact of both a rigid cylinder and a flexible composite cylinder on a water surface is simulated to assess the effect of slamming on the components of certain wave-energy converters. The impact pressure on the bottom of the rigid cylinder is nearly twice as high as on the flexible cylinder, which emphasizes the need for fluid-structure interaction calculations in the design process of these wave-energy converters. For both the rolling tank simulations and the impact simulations, grid refinement is performed and the IQN-ILS algorithm requires the same number of iterations on each grid. The simulations on the coarse grid are also executed using Gauss-Seidel coupling iterations with Aitken relaxation which requires significantly more coupling iterations per time step.

Original language | English (US) |
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Pages (from-to) | 2085-2098 |

Number of pages | 14 |

Journal | Computer Methods in Applied Mechanics and Engineering |

Volume | 199 |

Issue number | 33-36 |

DOIs | |

State | Published - Jul 2010 |

## Keywords

- Aitken relaxation
- Fluid-structure interaction
- Free surface
- IQN-ILS
- Impact
- Partitioned
- Rolling tank
- Volume-of-fluid