Three Dimensional Viscous Finite Element Formulation For Acoustic Fluid Structure Interaction.
Three Dimensional Viscous Finite Element Formulation For Acoustic Fluid Structure Interaction.
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DOI：
10.1016/j.cma.2008.04.016
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发表时间：
2008-09-15
影响因子：
7.2
通讯作者：
Grosh K
中科院分区：
文献类型：
--
作者：
Cheng L;White RD;Grosh K
本文提出了一种三维粘性有限元模型，用于分析声-流-结构相互作用系统，包括但不限于耳蜗换能器。该模型由三维粘性声学流体介质与二维平面结构域相互作用组成。流场由线性化的Navier-Stokes方程控制，流体位移和压力被选为独立变量。在流场中使用基于混合位移/压力的公式，以减轻几乎不可压缩流体中的锁定。该结构被建模为具有或不具有残余应力的Mindlin板。为了与27/4u/p流体单元相兼容，选用了Hinton-Huang的9节点拉格朗日板单元。全三维有限元模型的计算结果与实验结果以及Beltman薄膜粘声单元和二维半无粘单元的计算结果吻合较好。尽管它的计算成本很高，但它为其他数值模型或近似提供了基准解决方案，可与实验进行比较，并且它能够对任何不规则的几何形状和材料特性进行建模，而其他数值模型可能不适用。
A three dimensional viscous finite element model is presented in this paper for the analysis of the acoustic fluid structure interaction systems including, but not limited to, the cochlear-based transducers. The model consists of a three dimensional viscous acoustic fluid medium interacting with a two dimensional flat structure domain. The fluid field is governed by the linearized Navier-Stokes equation with the fluid displacements and the pressure chosen as independent variables. The mixed displacement/pressure based formulation is used in the fluid field in order to alleviate the locking in the nearly incompressible fluid. The structure is modeled as a Mindlin plate with or without residual stress. The Hinton-Huang’s 9-noded Lagrangian plate element is chosen in order to be compatible with 27/4 u/p fluid elements. The results from the full 3d FEM model are in good agreement with experimental results and other FEM results including Beltman’s thin film viscoacoustic element and two and half dimensional inviscid elements. Although it is computationally expensive, it provides a benchmark solution for other numerical models or approximations to compare to besides experiments and it is capable of modeling any irregular geometries and material properties while other numerical models may not be applicable.
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影响因子：
2.8
作者：
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通讯作者：
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发表时间：
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影响因子：
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