Journal
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
Volume 350, Issue -, Pages 169-198Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cma.2019.03.001
Keywords
Phase field; Dynamic crack; Hydraulic fractures; Poroelasticity; COMSOL
Funding
- Sino-German (CSC-DAAD) Postdoc Scholarship Program
- Natural Science Foundation of China [51474157, 734370]
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A phase field model for fluid-driven dynamic crack propagation in poroelastic media is proposed. Therefore, classical Biot poroelasticity theory is applied in the porous medium while arbitrary crack growth is naturally captured by the phase field model. We also account for the transition of the fluid property from the intact medium to the fully broken one by employing indicator functions. We employ a staggered scheme and implement our approach into the software package COMSOL Multiphysics. Our approach is first verified through three classical benchmark problems which are compared to analytical solutions for dynamic consolidation and pressure distribution in a single crack and in a specimen with two sets of joints. Subsequently, we present several 2D and 3D examples of dynamic crack branching and their interaction with pre-existing natural fractures. All presented examples demonstrate the capability of the proposed approach of handling dynamic crack propagation, branching and coalescence of fluid-driven fracture. (C) 2019 Elsevier B.Y. All rights reserved.
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