This article illustrates the use of a RANSE solver coupled to a motion solver to predict the free roll decay and the associated damping coefficients of floating bodies. The necessary building blocks to perform such a prediction are described briefly. A sensitivity study for the convergence criterion, the time step, the domain size and the grid resolution is performed for a simple 2-dimensional barge. The results are compared to results from experiments. Furthermore a simulation for a free roll decay of a Navy Combatant is performed, considering the results of the parameter study for the Barge. Overall results indicate that the natural roll frequency can be well predicted, while the prediction of the roll damping coefficients is afflicted with some uncertainties.

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