Numerical calculation procedure of global ship motion of LNG carrier considering LNG liquid dynamic effect in wave condition

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  • 独立型タイプB 方式球形LNG タンクの液体と船体運動の連成を考慮したタンク流体力の数値計算
  • ドクリツガタ タイプ B ホウシキ キュウケイ LNG タンク ノ エキタイ ト センタイ ウンドウ ノ レンセイ オ コウリョ シタ タンク リュウタイリョク ノ スウチ ケイサン

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<p>This report concerns a numerical calculation procedure for global ship motions of a LNG carrier considering LNG liquid dynamic effect in wave conditions. Both a frequency-domain and a time-domain analysis procedures of the ship motions are developed. The velocity potential of the liquid is obtained in the methods, based on the artificial damping on the free water surface of the liquid. The value of the damping factor is determined by model tests. The response amplitude operators of the hydrodynamic force of the tank are derived and the maximum value of the apparent transverse acceleration of the tank to design is predicted based on the long term distribution of the tank force. The estimated maximum value is almost equal to a conventional design chart method.</p>

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