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首页> 外文期刊>Journal of Computational Physics >Coupled fluid-structure solver: The case of shock wave impact on monolithic and composite material plates
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Coupled fluid-structure solver: The case of shock wave impact on monolithic and composite material plates

机译：耦合的流固求解器：冲击波冲击整体和复合材料板的情况

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An unstructured adaptive mesh flow solver, a finite element structure solver and a moving mesh algorithm were implemented in the numerical simulation of the interaction between a shock wave and a structure. In the past, this interaction is mostly considered as one-way in the sense that the shock causes a transient load on the structure while it is reflected uneffected by the impact. A fully coupled approach was implemented in the present work which can account for the effects associated with a mutual interaction. This approach included a compressible flow Eulerian solver of second order accuracy in finite volume formulation for the fluid and a Langargian solver in finite element formulation for the solid structure. A novel implementation of advancing front moving mesh algorithm was made possible with the introduction of a flexible and efficient quad-edge data structure. Adaptive mesh refinement was introduced into the flow solver for improved accuracy as well. Numerical results are further validated by theoretical analysis, experimental data and results from other numerical simulations. Grid dependency study was performed and results showed that the physical phenomena and quantities were independent of the numerical grid chosen in the simulations. The results illuminated complicated flow phenomena and structure vibration patterns, which in order to be detected experimentally require capabilities beyond those of the current experimental techniques. The numerical simulations also successfully modelled the aero-acoustic damping effects on the structure, which do not exist in previous numerical models. Further analysis of the results showed that the mutual interaction is not linear and that the non-linearity arises because the wave propagation in the fluid is not linear and it cascades a non-linear and non-uniform loading on the plate. Non-linearity intensifies when the plate is vibrating at high frequency while the wave propagation speed is low.
机译：在冲击波与结构相互作用的数值模拟中，实现了非结构化自适应网格流求解器，有限元结构求解器和移动网格算法。过去，这种相互作用通常被认为是单向的，因为在这种情况下，冲击会在结构上产生瞬态载荷，而其反射却不受冲击的影响。在当前工作中采用了一种完全耦合的方法，该方法可以解决与相互交互相关的影响。此方法包括在流体的有限体积公式中具有二阶精度的可压缩流欧拉求解器，在固体结构的有限元公式中包括Langargian求解器。通过引入灵活高效的四边数据结构，可以实现一种先进的前移网格算法。自适应网格细化也被引入到流量求解器中，以提高准确性。通过理论分析，实验数据和其他数值模拟的结果进一步验证了数值结果。进行了网格依赖性研究，结果表明物理现象和数量与仿真中选择的数字网格无关。结果阐明了复杂的流动现象和结构振动模式，为了在实验上进行检测，这些功能需要的能力超出了当前的实验技术。数值模拟还成功地模拟了结构上的空气声阻尼效应，这在以前的数值模型中是不存在的。对结果的进一步分析表明，相互的相互作用不是线性的，而是非线性的，因为流体中的波传播不是线性的，并且它将非线性和非均匀的载荷级联到板上。当板以高频率振动而波传播速度低时，非线性会加剧。

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