1. Schur‐type preconditioning of a phase‐field fracture model in mixed form.
- Author
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Heister, Timo, Mang, Katrin, and Wick, Thomas
- Subjects
- *
FRACTURE mechanics , *ELASTICITY - Abstract
In the context of phase‐field modeling of fractures in incompressible materials, a mixed form of the elasticity equation can overcome possible volume locking effects. The drawback is that a coupled variational inequality system with three unknowns (displacements, pressure and phase‐field) has to be solved, which increases the overall workload. Efficient preconditioning at this point is an indispensable tool. In this work, a problem‐specific iterative solver is proposed leveraging the saddle‐point structure of the displacement and pressure variable. A Schur‐type preconditioner is developed to avoid ill‐conditioning of the phase‐field fracture problem. Finally, we show numerical results of a pressure‐driven benchmark which to confirm the robustness of the solver. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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