Sequential finite element modelling of lightning arc plasma and composite specimen thermal-electric damage
Sequential finite element modelling of lightning arc plasma and composite specimen thermal-electric damage
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DOI：
10.1016/j.compstruc.2019.06.005
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发表时间：
2019-10
影响因子：
4.7
通讯作者：
S. Millen;A. Murphy;G. Abdelal;G. Catalanotti
中科院分区：
文献类型：
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作者：
S. Millen;A. Murphy;G. Abdelal;G. Catalanotti
高度复杂的现象，如雷击，需要能够捕捉许多不同物理的模拟方法。然而，在一个模拟中完成这一点并不总是理想的或可能的。在这种情况下，可能需要一种方法来将加载边界条件从一个模拟转移到下一个模拟，同时考虑到加载的特征形式和不同的域和网格几何形状。本文的目标是将两个模型结合起来，实现闪电弧和复合试样的自动顺序模拟。该方法是使用有限元模型开发的，其中磁流体动力学模型代表闪电等离子体，热电模型代表试样。基于上述等离子体模型的预测输出，自动生成试样网格和加载边界条件。该方法的精度、运行时间和灵活性得到了验证，热损伤预测的生成时间约为33 h。由于集成的建模能力，第一次预测了代表测试电边界条件的损伤，而不是假设的试样边界条件（这里使用测试波形B）。
Highly complex phenomena such as lightning strikes require simulation methods capable of capturing many different physics. However, completing this in one simulation is not always desired or possible. In such instances there can be a need for a methodology to transfer loading boundary conditions from one simulation to the next while accounting for the characteristic form of the loading and the dissimilar domain and mesh geometries. Herein, the objective is to combine two models to enable the automatic sequential simulation of a lightning arc and a composite test specimen. The approach is developed using Finite Element models, with a Magnetohydrodynamics model representing the lightning plasma and a thermal-electric model representing the specimen. The specimen mesh and loading boundary conditions are automatically generated based on the predicted output of the preceding plasma model. The precision, run-time and flexibility of the proposed approach is demonstrated, with thermal damage predictions generated in approximately 33 h. Resulting from the integrated modelling capability is the first time prediction of damage representing the test electric boundary conditions rather than assumed specimen boundary conditions (herein using test ‘Waveform B’).