Discussion Overview
The discussion revolves around troubleshooting issues encountered in a COMSOL simulation involving a sensor with a fixed surface and prescribed displacement. Participants explore convergence problems, particularly related to the use of hyperelastic materials and contact conditions in the model.
Discussion Character
- Technical explanation
- Debate/contested
Main Points Raised
- One participant reports persistent convergence issues despite increasing iterations, refining the mesh, and applying parametric studies, along with a warning about MUMPS out of core.
- Several participants inquire about the connection method of the parts and the use of contact in the analysis, suggesting that contact may complicate convergence.
- It is noted that the parts are joined using a form union, with plans to implement contact later.
- Concerns are raised about the presence of other forms of nonlinearity in the model, specifically questioning whether geometric nonlinearity is enabled and what material model is being used.
- A participant mentions that the model converges when set as a linear material but fails with a hyperelastic material, indicating that nonlinearity is enabled.
- Another participant suggests that the hyperelastic material might be unstable within a certain strain range and recommends trying a lower load or a different hyperelastic model, while also asking about the source of data for material constants.
Areas of Agreement / Disagreement
Participants express differing views on the best approach to resolve the convergence issues, particularly regarding the use of hyperelastic materials and contact conditions. The discussion remains unresolved with multiple competing perspectives on how to proceed.
Contextual Notes
Limitations include potential instability of hyperelastic materials within specific strain ranges and the impact of contact conditions on convergence. The discussion does not clarify the definitions or assumptions regarding the material models used.
