TY - GEN
T1 - Study on random wave force coefficients using numerical simulation of flow field
AU - Hu, Changhong
AU - Koterayama, Wataru
PY - 1993
Y1 - 1993
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:0027307565
SN - 1880653087
T3 - Proceedings of the Third (1993) International Offshore and Polar Engineering Conference
SP - 136
EP - 142
BT - Proceedings of the Third (1993) International Offshore and Polar Engineering Conference
PB - Publ by Int Soc of Offshore and Polar Engineerns (ISOPE)
T2 - Proceedings of the Third (1993) International Offshore and Polar Engineering Conference, Part 3 (of 4)
Y2 - 6 June 1993 through 11 June 1993
ER -