Crest of the Royal National Institution of Naval Architects - Click to return to the homepage


Europort Aug-Nov 2021


Cadmatic October 2021

IJME 328

Paper title:  Calculation of the Hydrodynamic Interaction Between Two Encountering Bodies in Coupling Multi-Freedom Motions



H M Wang, L Wang, L Q Tu and C H Zhao, School of Naval Architecture and Ocean Engineering, Zhejiang Ocean University, Key Laboratory of Offshore Engineering Technology of Zhejiang Province, China


The sway and yaw motion will be induced additionally due to the interaction effects when two encountering bodies sail in close proximity, which may lead to the collision accident. In the present study, two ellipsoids are taken as an example. By coupling the motion equations of the two bodies and the fluid flow equations, the interaction forces and moments are calculated, and the tracks are predicted. The numerical results for the model fixed motion (only free to surge) at constant speed are compared with those published in literature for the validation of the method proposed in this paper, and good agreement is found. On this basis, more complicated multi-degree of freedom motions in surge, sway and yaw directions induced by the interaction effects are simulated. By systematically comparing and analyzing the numerical results obtained at different speeds, lateral distances and body sizes, the influences of speed and lateral distance and body size on the hydrodynamic forces are elucidated.


Transactions RINA, Vol 157, Part A4, International Journal Maritime Engineering, Oct-Dec 2015 

DOI Number

DOI No: 10.3940/rina.ijme.2015.a4.328

Search and Order IJME papers

All International Journal of Maritime Engineering (IJME) papers are listed in the RINA Publications Database. You can search the database by author name and paper title. Publications may be ordered and paid for online. Other publications are also listed, some of which may be downloaded free of charge. Follow the link to Search Publications & Order.

RINA membership

Metstrade June 2021 New

Uni Stratchclyde June 2021

Teinbridge Propeller

Lloyds Academy Button July 2021

Nor Shipping October 2021 Button