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Abstract
A method for calculating second order forces on a vertical, large diameter circular cylinder is reported.Force spectra at sumfrequencies and difference frequencies as well as the first order force spectrum are calculated as a result of irregular waves generated from a Pierson-Moskowitz wave spectrum. Non-viscous fluid is assumed. Forces at sumfrequencies are compared to first order forces with focus on the wave period rangefrom 3 to 5 s, in which many deep water platforms have their first natural period. The calculations are also compared to model scale measurements performed in a wave flume at theNorwegian Hydrodynamic Laboratories in Trondheim.
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