The theory behind a computer programme for prediction of Vortex Induced Vibrations (VIV) of risers is summarised, and some experiences with its use are given. The programme in question is named VICoMo (VIV by Complex Modes) and is based on modal analysis by means of complex modes. The approach is iterative in nature because the added mass and damping forces depend nonlinearly on motion amplitude and frequency. Experiences with some runs to model a prototype Steel Caternary Riser (SCR) are summarised. A key element herein is the strategy for the choice of the parameters governing the iterations.
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