Robust Default Interaction Settings

Simulations that have bonded and contact definitions are more robust, even for models with slightly imperfect geometries. Algorithms that detect clearances between geometries and enforce appropriate interactions are improved, and user interface selections are simplified.

Enhancements for defining interactions between geometries include:
  • Separate options to set the global interaction type for linear static and other studies (Default Options > Interaction > Global interaction type > Bonded, Contact, or Free).
  • Global settings for qualifying areas propagate to the component interaction and local interaction definitions. The default global settings for new studies ensure that simulations can run even for models with slightly imperfect geometries. The software calculates the qualified regions based on a percentage of the characteristic length of the participating geometries.
    Global Default Options - Interactions Description
    Gap range for bonding: 0.01% of characteristic length Geometry entities that are within this clearance qualify for a bonding definition.
    Gap range to consider contact: 10 % of characteristic length Geometry entities that are within this clearance qualify for a contact definition.
    Stabilize the area if the gap is: 1% of characteristic length Applies a small stiffness to the qualified regions so the solver can overcome instability issues and start the simulation.
    These default settings for qualifying interactions are recommended for novice users that might encounter difficulties running simulations. More experienced users can customize these settings to fit their models.
  • Separate options for the global contact and bonding formulations (Default Options > Interaction > Contact Formulation, or Bonding Formulation).
  • Removal of node-to-node contact formulation. When you open models with legacy node-to-node contact definitions, SOLIDWORKS Simulation 2021 converts them to node-to-surface contact during the analysis.