NONLINEAR-WAVE INTERACTION WITH A VERTICAL CIRCULAR-CYLINDER - WAVE-FORCES

Second-order wave forces on a large diameter vertical circular cylinde r, computed according to a semi-analytic nonlinear diffraction theory, are compared to results of 22 laboratory experiments with regular wav es. In general, predicted forces agree quite well with measured forces . In most tests, both measured and predicted maximum forces exceeded l inear theory by 5 to 15%. In a few cases, however, the measured forces were less than those predicted by linear theory, in contrast to the s econd-order predictions. It is shown that these results are related to the phasing of various linear and nonlinear wave force components, an d are consistent with those obtained by other investigators. Published by Elsevier Science Ltd.