COMPARATIVE FREQUENCY DOMAIN SEAKEEPING ANALYSIS OF A FAST MONOHULL IN REGULAR HEAD WAVES

摘要

Two sets of seakeeping computations and comparative model teats were performed for a fast monohull in regular waves. The first set of computations used an existing three-dimensional frequency domain panel code that formulates the potential flow problem by means of the zero-speed Green function. The second set used a modified version of this code that implemented an advanced software module, newly developed within the European research project WAVELOADS, where the free-surface forward-speed Green function method based on the Fourier-Kochin formulation accounts for forward speed effects. Although this formulation provided a solid mathematical basis for obtaining robust and accurate numerical predictions, numerical inaccuracies prevented obtaining satisfactory results. For nearly all cases investigated, predictions from the original (zero-speed Green function) code correlated more favorably with test data than those from the modified (forward-speed Green function) code. For the fast monohull investigated here, practically relevant global load predictions based on the zero-speed Green function correlated favorably with measurements.