Computational aspects of the weak micro‐periodicity saddle point problem
Journal article, 2021

The finite element implementation of the weak micro-periodicity problem in computational homogenisation requires special preconditioning techniques owing to the saddle point formulation. The saddle point nature arises from enforcing periodicity constraints using Lagrange multipliers. This manuscript addresses the solution techniques and preconditioning options for the aforementioned problem in a monolithic setting. Furthermore, an alternative technique is proposed, based on a linear multi-point constraints strategy. The latter approach eliminates the Lagrange multiplier Degrees of Freedom (DOFs), thereby preventing the break-down of conventional incomplete LU (ILU) variants and multi-grid method based preconditioners.

micro-periodicity

saddle-point

Author

Ritukesh Bharali

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Fredrik Larsson

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Ralf Jänicke

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Proceedings in Applied Mathematics and Mechanics

1617-7061 (ISSN)

Vol. 20 1

Subject Categories

Computational Mathematics

DOI

10.1002/pamm.202000259

More information

Latest update

2/15/2021