CFD based form factor determination method

The 1978 ITTC Power Prediction method is used to predict the propulsive power of ships through towing tank testing. form factor approach and its determination in this have been questioned. This paper investigates possibility improve predictions by introducing Combined CFD/EFD Method where experimental replaced double body RANS computations applied for open cases KVLCC2 KCS, including first-time published tests at ballast condition an uncertainty analysis specifically derived factor. Computations from nine organisations seven CFD codes are compared experiments. both hulls design loading well with results general. For condition, majority factors were under-predicted while staying within uncertainty. Speed dependency observed application ITTC57 line but it reduced Katsui nearly eliminated numerical friction lines. Comparison full-scale viscous resistance obtained extrapolations model scale direct show that significantly less scatter may thus be a preferred approach.