论文标题

有限菌株丙非py纯弹性:ANN支持的渐近多尺度ALE-FSI方法

Finite strain porohyperelasticity: An asymptotic multiscale ALE-FSI approach supported by ANNs

论文作者

Dehghani, Hamidreza, Zilian, Andreas

论文摘要

在此贡献中提供了解决毛囊弹性问题的管理方程和数值解决方案策略,以解决多层物理学介质。该问题始于使用任意拉格朗日 - 欧拉(ALE)技术在孔内制定流体固体相互作用(FSI)问题。使用渐近均质化技术对PDE的PDE的ALE-FSI耦合系统进行扩展和分析,该技术产生了三个部分新颖的PDES系统,其中一个是由两个显微镜问题(流体和固体)提供的宏观/有效问题。后两个提供了微观响应字段,其平均值是在实时/在线形式中需要的,以确定宏观响应。通过训练人工神经网络(ANN)作为微观固体问题的直接数值解决方案(DNS),可以有效地有效。本方法允许首次使用应变能的直接衍生物来求解有限应变(多尺度)的毛囊弹性问题。此外,引入了简单的实时输出密度检查,以实现DNS的最佳可靠培训数据集。采用了代表性的体积元素(RVE),然后进行显微镜(RVE)灵敏度分析和多尺度限制合并模拟,表明在处理有限的菌株毛弹性/毛透析性弹性问题时采用当前方法的重要性。

The governing equations and numerical solution strategy to solve porohyperelastic problems as multiscale multiphysics media are provided in this contribution. The problem starts from formulating and non-dimensionalising a Fluid-Solid Interaction (FSI) problem using Arbitrary Lagrangian-Eulerian (ALE) technique at the pore level. The resultant ALE-FSI coupled systems of PDEs are expanded and analysed using the asymptotic homogenisation technique which yields three partially novel systems of PDEs, one governing the macroscopic/effective problem supplied by two microscale problems (fluid and solid). The latter two provide the microscopic response fields whose average value is required in real-time/online form to determine the macroscale response. This is possible efficiently by training an Artificial Neural Network (ANN) as a surrogate for the Direct Numerical Solution (DNS) of the microscale solid problem. The present methodology allows for solving finite strain (multiscale) porohyperelastic problems accurately using the direct derivative of the strain energy, for the first time. Furthermore, a simple real-time output density check is introduced to achieve an optimal and reliable training dataset from DNS. A Representative Volume Element (RVE) is adopted which is followed by performing a microscale (RVE) sensitivity analysis and a multiscale confined consolidation simulation showing the importance of employing the present method when dealing with finite strain poroelastic/porohyperelastic problems.

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