SUMMARYThis paper presents an investigation of strategies for handling dissipative phase interactions in the context of multi-field material point method formulations in which each phase is assigned its own motion. Different families of phase interaction strategies using both nodal and particle-based approaches are developed, and in particular, a new smoothed volume fraction approach is presented that can handle interaction effects in a general and consistent manner while reducing anomalous effects of phase boundaries and grid crossings. The effectiveness of this approach is demonstrated via convergence studies using a fundamental model problem.
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