### Abstract

A new approach to investigate the hydrodynamic forces acting on a vertical cylinder in random waves is presented. The time series of random wave force is obtained from numerical simulation of a two-dimensional irregular oscillating flow around a circular cylinder by numerical solution of the incompressible Navier-Stokes equation expressed in a generalized coordinate system through the use of MAC method. The random waves are chosen from laboratory experimental data. To obtain the Morrison force coefficients, two methods are used: least squares fit of total force time series and least squares fit on a wave-by-wave basis. The phenomena found in calculated results are similar to those in the experiments, and the study revealed that the so-called history effect of random wave forces is mainly due to the vortex shedding, which is confirmed by computed flow patterns.

Original language | English |
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Title of host publication | Proceedings of the Third (1993) International Offshore and Polar Engineering Conference |

Publisher | Publ by Int Soc of Offshore and Polar Engineerns (ISOPE) |

Pages | 136-142 |

Number of pages | 7 |

ISBN (Print) | 1880653087 |

Publication status | Published - 1993 |

Event | Proceedings of the Third (1993) International Offshore and Polar Engineering Conference, Part 3 (of 4) - Singapore, Singapore Duration: Jun 6 1993 → Jun 11 1993 |

### Other

Other | Proceedings of the Third (1993) International Offshore and Polar Engineering Conference, Part 3 (of 4) |
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City | Singapore, Singapore |

Period | 6/6/93 → 6/11/93 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Engineering(all)

### Cite this

*Proceedings of the Third (1993) International Offshore and Polar Engineering Conference*(pp. 136-142). Publ by Int Soc of Offshore and Polar Engineerns (ISOPE).