Accuracy of a Non-Smooth Time Stepping Scheme with Non-Rigid Contacts for Ice-Structure Interaction

Discrete element methods enable the authors to model the interactions between individual ice blocks and the structure of interest. This may give information on relevant processes in ice- structure or ice-ice interaction that cannot be captured by continuous methods. Discrete element methods can broadly be divided into two categories;smooth and non-smooth. While the former is known for high computational cost, the latter may significantly reduce the calculation time of discrete element simulations by enabling larger time steps. This paper investigates the applicability bounds of a novel non-smooth discrete element time stepping scheme that includes contact non-rigidity. Contact non-rigidity allows the authors to compute ice-structure or ice-ice contact forces based on crushing assumptions. Additionally, it enables the modelling of deformable ice features and failure. A major advantage of the applied method is that it maintains stability for a much wider range of time step sizes. This enables discrete element simulations with a much reduced calculation time compared to smooth methods. The accuracy of the applied method is investigated for two case studies. Results show that accurate results can be generated with significantly larger time steps than used in other methods.


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  • Accession Number: 01747430
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 22 2020 4:44PM