Fluid-structure interaction involving large deformations: 3D simulations and applications to biological systems.
Fluid-structure interaction involving large deformations: 3D simulations and applications to biological systems.
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DOI：
10.1016/j.jcp.2013.10.047
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发表时间：
2014-02-01
影响因子：
4.1
通讯作者：
Rousseau B
中科院分区：
文献类型：
--
作者：
Tian FB;Dai H;Luo H;Doyle JF;Rousseau B
涉及柔性体大变形的三维流固耦合（FSI）在生物系统中很常见，但精确有效的数值模拟方法还很缺乏。在这项工作中，我们报告了一个成功的情况下，结合现有的浸没边界流求解器与非线性有限元固体力学求解器，专门用于三维流固耦合模拟。这种方法代表了从以前可用的类似方法的显著增强。基于直角坐标网格，粘性不可压缩流动求解器可以处理大位移的边界和简单的网格生成。固体力学求解器具有单独的子程序，用于分析一般三维物体和由框架、膜和板组成的薄壁结构。与大位移相关的几何非线性和与大应变相关的材料非线性都包含在求解器中。FSI是通过强耦合和分区的方法来实现的。我们进行了几个验证案例，其结果可以用来扩展目前有限的FSI基准研究数据库。最后，我们通过将其应用于昆虫弹性翅膀的空气动力学和流动诱导的声带振动，证明了本方法的通用性。
Three-dimensional fluid–structure interaction (FSI) involving large deformations of flexible bodies is common in biological systems, but accurate and efficient numerical approaches for modeling such systems are still scarce. In this work, we report a successful case of combining an existing immersed-boundary flow solver with a nonlinear finite-element solid-mechanics solver specifically for three-dimensional FSI simulations. This method represents a significant enhancement from the similar methods that are previously available. Based on the Cartesian grid, the viscous incompressible flow solver can handle boundaries of large displacements with simple mesh generation. The solid-mechanics solver has separate subroutines for analyzing general three-dimensional bodies and thin-walled structures composed of frames, membranes, and plates. Both geometric nonlinearity associated with large displacements and material nonlinearity associated with large strains are incorporated in the solver. The FSI is achieved through a strong coupling and partitioned approach. We perform several validation cases, and the results may be used to expand the currently limited database of FSI benchmark study. Finally, we demonstrate the versatility of the present method by applying it to the aerodynamics of elastic wings of insects and the flow-induced vocal fold vibration.
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