Parallel computations in nonlinear solid mechanics using adaptive finite element and meshless methods

Purpose – A variety of meshless methods have been developed in the last 20 years with an intention to solve practical engineering problems, but are limited to small academic problems due to associated high computational cost as compared to the standard finite element methods (FEM). The purpose of th...

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Vydáno v:Engineering computations Ročník 33; číslo 4; s. 1161 - 1191
Hlavní autoři: Ullah, Zahur, Coombs, Will, Augarde, C
Médium: Journal Article
Jazyk:angličtina
Vydáno: Bradford Emerald Group Publishing Limited 13.06.2016
Témata:
Accuracy
Adaptive algorithms
Aerospace engineering
Algorithms
Basis functions
Biomechanics
Communication
Computation
Computer memory
Computer simulation
Computers
Constitutive models
Deformation
Distributed memory
Elastoplasticity
Engineering
Finite element method
Formulations
Fracture mechanics
Geomechanics
Geometry
Libraries
Linear algebra
Mathematical analysis
Mathematical models
Maximum entropy
Meshless methods
Message passing
Methods
Nonlinearity
Numerical analysis
Open source software
Performance enhancement
Public domain
Simulation
Software
Software packages
Solid mechanics
Source code
Adaptively coupled finite element-meshless method
Adaptivity
Error estimation
Parallel computations
Maximum entropy shape functions
Meshless method
ISSN:0264-4401, 1758-7077
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Shrnutí:Purpose – A variety of meshless methods have been developed in the last 20 years with an intention to solve practical engineering problems, but are limited to small academic problems due to associated high computational cost as compared to the standard finite element methods (FEM). The purpose of this paper is to develop an efficient and accurate algorithms based on meshless methods for the solution of problems involving both material and geometrical nonlinearities. Design/methodology/approach – A parallel two-dimensional linear elastic computer code is presented for a maximum entropy basis functions based meshless method. The two-dimensional algorithm is subsequently extended to three-dimensional adaptive nonlinear and three-dimensional parallel nonlinear adaptively coupled finite element, meshless method cases. The Prandtl-Reuss constitutive model is used to model elasto-plasticity and total Lagrangian formulations are used to model finite deformation. Furthermore, Zienkiewicz and Zhu and Chung and Belytschko error estimation procedure are used in the FE and meshless regions of the problem domain, respectively. The message passing interface library and open-source software packages, METIS and MUltifrontal Massively Parallel Solver are used for the high performance computation. Findings – Numerical examples are given to demonstrate the correct implementation and performance of the parallel algorithms. The agreement between the numerical and analytical results in the case of linear elastic example is excellent. For the nonlinear problems load-displacement curve are compared with the reference FEM and found in a very good agreement. As compared to the FEM, no volumetric locking was observed in the case of meshless method. Furthermore, it is shown that increasing the number of processors up to a given number improve the performance of parallel algorithms in term of simulation time, speedup and efficiency. Originality/value – Problems involving both material and geometrical nonlinearities are of practical importance in many engineering applications, e.g. geomechanics, metal forming and biomechanics. A family of parallel algorithms has been developed in this paper for these problems using adaptively coupled finite element, meshless method (based on maximum entropy basis functions) for distributed memory computer architectures.
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ISSN:0264-4401
1758-7077
DOI:10.1108/EC-06-2015-0166