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Title: A multiscale mass scaling approach for explicit time integration using proper orthogonal decomposition

One of the main computational issues with explicit dynamics simulations is the significant reduction of the critical time step as the spatial resolution of the finite element mesh increases. In this work, a selective mass scaling approach is presented that can significantly reduce the computational cost in explicit dynamic simulations, while maintaining accuracy. The proposed method is based on a multiscale decomposition approach that separates the dynamics of the system into low (coarse scales) and high frequencies (fine scales). Here, the critical time step is increased by selectively applying mass scaling on the fine scale component only. In problems where the response is dominated by the coarse (low frequency) scales, significant increases in the stable time step can be realized. In this work, we use the proper orthogonal decomposition (POD) method to build the coarse scale space. The main idea behind POD is to obtain an optimal low-dimensional orthogonal basis for representing an ensemble of high-dimensional data. In our proposed method, the POD space is generated with snapshots of the solution obtained from early times of the full-scale simulation. The example problems addressed in this work show significant improvements in computational time, without heavily compromising the accuracy of the results.
Authors:
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Publication Date:
OSTI Identifier:
1122106
Report Number(s):
INL/JOU-12-26161
Journal ID: ISSN 0029-5981
DOE Contract Number:
DE-AC07-05ID14517
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal for Numerical Methods in Engineering; Journal Volume: 97; Journal Issue: 11
Research Org:
Idaho National Laboratory (INL)
Sponsoring Org:
DOE - NA
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING explicit dynamics; mass scaling; multiscale; POD