对于模拟液舱内流体运动，传统频域方法具有很大的局限性，其只能在线性条件下针对每个频率计算系统的响应，然后通过谱分析方法得到系统不规则激励的解，而不能直接通过加载不规则的激励得到不规则的响应，但是本文采用基于去奇异边界元的方法，可在时域内建立液舱内不规则流体晃荡问题的流体动力学数值模型，并利用FORTRAN开发了一套可以模拟任意尺度和形状的液舱晃荡程序。本文首先模拟了单向激励下液舱晃荡问题，并将数值解与解析解进行比较，验证了其准确性和精度。在此基础上，针对不规则波激励下液舱晃荡问题进行了模拟，结果表明文中方法可以有效模拟液舱晃荡问题。
Abstract
The traditional frequency domain method has large limitations to simulate liquid sloshing in a tank.It only can be used to calculate a system’s response of each frequency under linear condition.The system’s responses under irregular excitations can be obtained with the spectral analysis method.Here, a method called DBIEM (de-singularized boundary integral element method) was proposed.Based on DBIEM, a liquid dynamic numerical model was built to solve liquid sloshing problems in a tank.A calculation program was developed using FORTRAN to simulate liquid sloshing in tanks with arbitrary shape and size.Firstly, a liquid tank sloshing problem was simulated under a single direction excitation.Its result was compared with its analytic solution, and the correctness and accuracy of the proposed method were verified.Then, liquid tank sloshing problems were simulated under irregular excitations.The results showed that the proposed method can be used to effectively simulate liquid tank sloshing problems.
关键词
液舱晃荡 /
去奇异边界元 /
波面形态 /
不规则波
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Key words
Sloshing /
DBIEM /
Free surface /
Random wave
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