Experimental study of in-line forces on a large diameter fixed vertical cylinder to random waves

• Main Authors: Srinivasan, N., Swamidas, A. S. J., Pawlowski, J. S.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: 1989
• Subjects: Random waves; wave force; Arctic
• Online Access: https://nrc-publications.canada.ca/eng/view/object/?id=2142570e-83c3-46d9-97ee-e20335f2a0bf; https://nrc-publications.canada.ca/fra/voir/objet/?id=2142570e-83c3-46d9-97ee-e20335f2a0bf

This paper presents results of a series of experiments conducted on 0.3m diameter fixed cylinder in a wave tank. The total forces exerted on the vertical cylinder for random waves have been measured directly using a sophisticated experimental arrangement. Representative spectra were selected and used to simulate random wave conditions. The numerical simulation procedure is discussed. The problems encountered due to the reflection of waves were solved by choosing a proper cut-off-frequency and the number of components for the target spectrum. The random wave force spectra were predicted using least square method, cross-spectral method and equivalent KsubC number method. The equivalent KsubC number method uses the hydrodynamic coefficients obtained from a regular wave test for the corresponding KsubC number. Good correlations between the predicted wave force spectra and the measured wave force spectra were obtained. It is also shown that the equivalent KsubC number method is accurate enough to predict the random wave forces on large structures at very low KsubC numbers. [Author Abstract] NRC publication: Yes