Study on random wave force coefficients using numerical simulation of flow fields

Changhong Hu, Wataru Koterayama

Research output: Contribution to journalArticle

2 Citations (Scopus)

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 the MAC method. The random waves are chosen from laboratory experimental data. To obtain the Morison 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 languageEnglish
Pages (from-to)278-283
Number of pages6
JournalInternational Journal of Offshore and Polar Engineering
Volume4
Issue number4
Publication statusPublished - Dec 1 1994

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All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Ocean Engineering
  • Mechanical Engineering

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