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A modified immersed smoothed FEM with local field reconstruction for fluid-structure interactions

机译:具有局部场重构的改进型浸入式平滑FEM,用于流固耦合

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摘要

A modified immersed smoothed finite element method (mIS-FEM) is proposed for fluid-structure interactions (FSI) using linear triangular elements in this paper. A sharp interface treatment is proposed and implemented to modify the original IS-FEM. The proposed treatment reconstructs the fluid velocity field near interface using auxiliary triangles, leading to better resolutions without much extra efforts. In the proposed method, the fluid solver is the FEM with a semi-implicit characteristic-based split (CBS) scheme using linear triangles. For the solid solver, the S-FEM based on explicit total Lagrangian formulation is used to solve finite solid deformation. Several numerical examples are employed to verify proposed mIS-FEM, and to examine the improvements. The results demonstrate that mIS-FEM is a reliable and robust numeric method for interactions between fluid and solids undergo large deformation.
机译:本文提出了一种改进的浸入式平滑有限元方法(mIS-FEM),用于使用线性三角单元的流体-结构相互作用(FSI)。提出并实施了一种尖锐的界面处理方法来修改原始的IS-FEM。所提出的处理方法使用辅助三角形来重建界面附近的流体速度场,从而无需花费额外的精力即可获得更好的分辨率。在提出的方法中,流体求解器是使用线性三角形的基于半隐式基于特征的分裂(CBS)方案的FEM。对于固体求解器,使用基于显式总拉格朗日公式的S-FEM来求解有限的固体变形。使用几个数值示例来验证提议的mIS-FEM,并检查改进之处。结果表明,mIS-FEM是可靠且鲁棒的数值方法,用于流体与固体之间的相互作用进行大变形。

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