液体晃荡荷载与液舱运动相位关系的数值研究

Numerical study on phase relation between sloshing-induced global force and tank motion

该文从相位角度出发,采用CFD的数值方法研究简谐激励下液体晃荡整体荷载与液舱运动的相位关系。首先,通过模型实验验证数值方法的可靠性,然后,以横荡激励下的二维矩形舱晃荡为例,研究不同载液率工况下,相位差和晃荡整体荷载幅值随激励频率的变化关系。结果表明：基于VOF法的数值模拟能较好地模拟液舱内液体晃荡;在自由面共振频率附近（0.8 f0～1.2 f0）,相位差随激励频率增加而增大;频率比相同时,相位差随载液率的升高而增大;相位差90°时,相位差对应频率低于共振频率,且与晃荡荷载最大值对应频率基本相等。

From phase analysis point of view, this paper presents the phase relation between the sloshing global load and tank motion under harmonic forced excitation based on the CFD method. And the sloshing model tests were carried out to verify the reliability of the numerical method. Then, the phase differences between the sloshing global load and the motion of a 2D-rectangular tank and the amplitudes of sloshing global load with forced-frequencies are obtained for different filling levels. The results show that the tank sloshing can be simulated well by V0F method; the phase differences raise when increasing forced-frequen- cies around resonant frequencies of free surface （0.8f0～1.2f0）; the phase differences also increase for high- er filling levels at same frequency ratio; the frequency for 90-degree phase difference is less than the reso- nant frequency and it is roughly equal to that for the maximum sloshing global load.