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The Effects of Deck Wetting on Capsize of Ships

Research Project

Project/Area Number 62550324
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 船舶抵抗・運動性能・計画
Research InstitutionKyushu University

Principal Investigator

KOTERAYAMA Wataru (1988)  Kyushu University, 応用力学研究所, 教授 (80038562)

大楠 丹 (1987)  九州大学, 応用力学研究所, 教授 (70038537)

Co-Investigator(Kenkyū-buntansha) KYOZUKA Yusaku  Kyushu University, 応用力学研究所, 助教授 (80177948)
KASHIWAGI Masashi  Kyushu University, 応用力学研究所, 助教授 (00161026)
Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1987: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsDeck wetness / Ship motion / Capsize / Following oblique waves / 画像表示 / 数値シミュレーション
Research Abstract

In order to know the ship's behaviour in waves under the influence of deck wetness and resultant shipping water, it is not sufficient to predict whether the deck wetness occurs or not. it is crucial to know how much amount of water flows into on deck. Moreover we need to predict how the shipping water due to the deck wetness changes the ship motions to lead to the fatal stage of capsize.
In this project, firstly we confirmed that the theoretical prediction of critical wave height of deck wetness agrees quite well with experiments. Secondly, adopting a simple formula for the velocity of water flowing into on deck, we proposed an empirical method of calculating the amount of shipping water. The effect of these shipping water was incorporated in a simplified manner into the equations of ship motions in beam seas. The motion equations adopted in this project are not rigorous, when describing the transient phenomena of deck wetness and the effect of dynamic motion of shipping water. llowever we confirmed that the proposed simulation method describes well the behaviour of ship model observed in experiments, from the start of deck wethness to the capsize or to the suppression of deck wethness.
Furthermore we developed a computer program to display the simulation results as the animation on the picture of computer graphic. This makes it easy to understand the overall phenomena of ship's capsize, and thus may provide various information useful for the investigation of safety of a ship.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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