Seakeeping Performance Research Group


 With the focus on research on ship motion in waves, the Seakeeping Performance Research Group is conducting following research.

  1. Analysis of ship capsizing/sinking accidents.
  2. Estimation of ship motions in still water and in waves.
  3. Estimattion of flooding area and motion of damaged ships.
  4. Research on the mechanism of freak wave and its impact on ships.

 As an experiment accompanying these studies, we are conducting various tests; towing model tests and free running tests in the actual sea model basin and the 150m towing tank, and actual sea area tests of actual ships.
 In parallel with the experiment, we are also developing an estimation method using numerical calculation, and we are making efforts to prevent ship accidents from both sides of the experiment and numerical calculation.



(◎: Head of the Group)


Research Overview

1.  Study on wave-making method in test tank
 The actual sea model basin has 382 wave-making devices installed around the entire circumference, and by precisely controlling the movement of each device, it is enabled to raise the desired point on the water surface and draw letters and patterns as desired.
 The videos show how the waves are concentrated at one point on the water surface and the characters of the new era, "Reiwa" are drawn.

2.  Motion calculation of recreational fishing boats in waves using the CFD software of NMRI
 When a high-speed passenger ship or fishing boat sails in the waves at high speed, severe hull motion and resultant excessive acceleration may occur.
 The Seakeeping Performance Research Group is conducting research on hull motion estimation methods that does not rely on model tank tests to analyze dangerous events.
 The video below shows the wave motion calculation of a recreational fishing boat using the CFD "NAGISA" developed by the CFD Research Group at our department.
(This calculation was carried out in "Study on experimental method and time series calculation method in diagonal heading wave of semi-sliding high-speed ship".)


Other Research

  1. Research on safety standards for new type passenger ships and cargo ships in case of damage.
  2. Research on technology development and standardization required for safe navigation and marine accident prevention.
  3. Research on the dragging anchor prevention support system.
  4. Research on safety assessment methods for unmanned vessels.
  5. Research on experimental method and time series calculation method for semi-displacement type high-speed ship in oblique heading waves
  6. Direct stability evaluation in multidirectional irregular waves considering three-dimensional dynamic rope tension during towing
  7. Construction of a safety return simulation method for passenger ships in the event of damage or flood