基于全时域势流理论的船舶与液舱晃荡耦合运动的数值计算

Numerical method of ship motions coupled with tank sloshing based on fully time domain potential flow theory

基于三维线性有航速时域势流理论计算船体时域运动外域波浪力,同时采用三维全非线性时域势流理论来计算舱内液体的非线性晃荡所诱导力与力矩,进而建立了波浪中载液船舶耦合运动方程。该方法能够完整地考虑波浪、船体和液舱晃荡之间的实时耦合作用。研究结果表明:通过模型实验和数值模拟计算的对比,数值模拟计算能够清晰显现出液舱晃荡对船体全局运动影响,无航速船体运动RAO与模型实验结果吻合良好,有航速运动计算合乎预期。

Based on three dimensional time domain potential theory, ship motion is solved by using an impulse response function method and boundary element method. Using three dimensional fully nonlinear time domain potential theory to simulate the nonlinear tank sloshing. Then the ship motion coupled with tank sloshing is established that the interactions of wave, ship body and tank sloshing are completely taken into considerations. Numerical simulation and experimental studies indicate that the numerical results of ship motion coupled with tank sloshing can clearly show the coupling effect of tank sloshing on the ship global motion. The results of the ship motion RAO of both computational and experiment ones are in good agreement,the numerical result of ship which has forward speed with liquid tank is also agreed with expectation.