Prediction of roll motion using fully nonlinear potential flow and Ikeda’s method
Paper i proceeding, 2021

Getting the best possible accuracy with the lowest possible computational cost is an important factor in the early design stage of ships. Potential flow-based analysis presents such a solution for seakeeping analyses. The accuracy of roll motion in potential flow is however not so good, due to the large influence from vicsous roll damping, which is missing in these calculations. This paper proposes a hybrid method, as a solution to this problem, where the viscous roll damping from Ikeda’s semi-empirical method is injected into an existing 3D unsteady fully nonlinear potential flow (FNPF) method. The hybrid method is investigated using roll decay tests with the KVLCC2 test case. This investigation shows that the accuracy of simulated roll motions is significantly improved and also shows good agreement with the corresponding roll decay model tests.


Ikeda’s method

Boundary element methods

Fully nonlinear potential flow (FNPF)




Martin Alexandersson

Chalmers, Mekanik och maritima vetenskaper

SSPA Sweden AB

Martin Kjellberg

SSPA Sweden AB

Wengang Mao

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

Jonas Ringsberg

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

Proceedings of the International Offshore and Polar Engineering Conference

10986189 (ISSN) 15551792 (eISSN)

9781880653821 (ISBN)

31st International Ocean and Polar Engineering Conference, ISOPE 2021
Virtual, Online, ,


Rymd- och flygteknik


Strömningsmekanik och akustik

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