Chinese Journal of Computational Physics ›› 2024, Vol. 41 ›› Issue (5): 607-618.DOI: 10.19596/j.cnki.1001-246x.8799

• Research Reports • Previous Articles     Next Articles

A MMALE Method Based on Interface Reconstruction for Three-dimensional Elastic-Plastic Multi-material Flow

Shaodong GUO(), Haibing ZHOU, Jun XIONG   

  1. Institute of Applied Physics and Computational Mathematics, Beijing 100094, China
  • Received:2023-07-06 Online:2024-09-25 Published:2024-09-14

Abstract:

The MMALE (multi-material Arbitrary Lagrangian Eulerian method) is an effective method for the simulation of multi-material flow with large deformation. Traditional MMALE methods are mainly used in pure fluids and focus on two-dimensional problems. In this paper, we propose a three-dimensional MMALE algorithm for elastic-plastic fluids by developing three key technologies: a closure model for elastic-plastic flow, an interface reconstruction method adapted to three-dimensional grids with large deformation, and a physical property preserving remapping method for elastic-plastic quantities. Firstly, to solve the pressure imbalance problem caused by elastic-plastic fluids using traditional bulk modulus weighted closure models, a relaxation mechanism is introduced in our new closure model to achieve the balance of the pressure. At the same time, this model does not require iterations, avoiding the difficulties of non convergence that may be encountered during the iteration process; Secondly, in order to address the conservation issues caused by distorted three-dimensional polyhedral grids, a step-by-step surface triangulation algorithm is introduced to preserve the conservation during the interface reconstruction process. Thirdly, in the aspect of the remapping of elastic-plastic quantities, aiming at the problem that the tensor property is destroyed and the strain energy is not conserved after the deviator stress is remapped component by component, the remapping of invariants of the stress tensor is introduced to preserve the tensor property and maintain the conservation of the strain energy. Finally, the MMALE method is used to simulate several typical examples, and its correctness and robustness are verified.

Key words: elastic-plastic, multiple material, interface reconstruction, MMALE

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