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Title:Numerical simulation of fragmentation and spalling and parallelization of a spacetime finite element code
Author(s):Marwah, Kartik
Advisor(s):Haber, Robert B.
Department / Program:Mechanical Sci & Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):discontinuous galerkin finite element
interfacial damage
parallel computing
shared memory
Abstract:We present a study of the problem of spalling and fragmentation using a Space Time Discontinuous Galerkin Finite Element Method (SDGFEM) coupled with an interfacial damage model. SDGFEM offers many advantages over conventional finite element methods. These include element-wise conservation, linear computational complexity, powerful dynamic adaptive meshing, interface tracking, preservation of characteristic structure and suitability for large-scale parallel computing. The interfacial damage model and dynamic adaptive meshing allow free nucleation and propagation of cracks that are located and oriented arbitrarily in the domain without any mesh bias. This model does not alter the effective bulk properties of the material at any level of mesh refinement. Numerical examples demonstrate that the method successfully captures spall in an elastic bar and the initiation of fragmentation in a plate. We present a parallelization methodology based on shared-memory parallelism for the SDGFEM code. A patch-by-patch solution procedure, higher efficiency of the three-field SDGFEM formulation compared to the single-field formulation and linear complexity in the number of space-time elements make the SDGFEM very suitable for parallelization. Based on code profiling, the assembly and solution stages of the code are parallelized. One of the latest architectures, the Intel Many Integrated Core (MIC) architecture, available on Intel Phi Cards is explored. Sequential optimization, vectorization and OpenMP multi-threading lead to good speedups. Some initial results obtained using the MIC architecture seem promising and complete parallelization on the MIC architecture is planned as an extension of this work.
Issue Date:2014-05-30
Rights Information:Copyright 2014 Kartik Marwah
Date Available in IDEALS:2014-05-30
Date Deposited:2014-05

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