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.

UR - http://www.scopus.com/inward/record.url?scp=0027307565&partnerID=8YFLogxK

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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 -