Systematic Analysis of the Effects of Scale and Draft Variation on Form Factor Using a Combined EFD/CFD Method

In recent years, numerous studies have focused on predicting the form factor of a ship and the resulting scale-related impacts, as the reliability of this estimate has been questioned. This study focuses on investigating the difference between model and fullscale CFD-based form factor computations using a newly established method. The method is called 2-k method, and it shows improvements in the accuracy of form factor estimation, providing better results by applying the full-scale process, especially in the case of stern flow separation phenomena. Three benchmark hulls have been tested in this study. The research uncovers a remarkable dependency of form factor on grid resolution through scale factor variations, while the results show consistency with the ones from the literature. Systematic variation of transom submergence is also executed which presents consistency of form factor results in both model and full scale. Implementing the systematic analysis in scale and draft variations, the results show that the 2-k method is considered a holistic and trustworthy method, and it can provide reliable prediction of form factor, even in cases of presence of recirculating flow region behind a submerged transom.