Roll damping of a twin-screw vessel: Comparison of RANSE-CFD with established methods

First published in
Fluid mechanics and its applications  
Number in series
119
Start Page
191
End Page
209
Citation
Fluid Mechanics and its Applications (119): 191-209 (2019)
Publisher DOI
10.1007/978-3-030-00516-0_11
Scopus ID
2-s2.0-85060165487
© Springer Nature Switzerland AG 2019. A RANSE-CFD method is applied to estimate the roll damping of a modern twin-screw RoPax vessel. The simulations are carried out in full scale and with an undisturbed water surface. The harmonic forced roll motion technique is implemented. The influence of ship speeds, the vertical position of the roll axis and roll amplitudes up to 35° are investigated. The interaction between the bilge keels and the ship hull is analyzed. The damping effects of further appendages are discussed. All simulation results are compared with the established method developed by Ikeda and a neural network method based on Blume’s roll damping measurements. The established methods were developed based on studying results of single-screw ships. It can be concluded that both established methods provide acceptable results in certain ranges. For large roll amplitudes, the established methods are out of range and cannot deliver reliable results.