Learning Forum

[Dennis Chen]

How can I better understand below statement from the documentation about control_adaptive and hyperelastic materials?   Why is adaptive remeshing having problems with large deformation problems or with hyperelastic materail model?   I suspect it has to do with how strain energy potentials are implemented but I honestly have no idea and I would like to develop some basic understanding of why this is an issue and to what degree it is an issue?

Has anyone in Ansys done any studies that can be shared with me?

[Ram Gopisetti]

Hi Dennis, 

Remeshing is a process of modifying the existing mesh—either refining or coarsening it—based on a specified solution criterion. Typically, this involves transferring the solution from the last time point of the previous mesh to the newly refined or coarsened mesh. During this transfer, or mapping process, irregularities can occur depending on how the data is projected. For example, when refining, one result may need to be mapped to multiple nodal points, and vice versa when coarsening. As the frequency of remeshing increases, these irregularities accumulate as residuals, which can lead to numerical errors.

Furthermore, because even small refinements can reduce the stable timestep size, excessive remeshing may introduce instabilities. Therefore, it is generally important to maintain an appropriate balance between the remeshing frequency, CPU cost, and overall solution quality—not only in “hyperealstic material” simulations but in general usage.

In practice, users should apply sound engineering judgment when employing such approaches and should evaluate the relationship between error behavior and remesh-refinement frequency through a controlled test case to ensure stable and accurate results.

Cheers, Ram 

[Dennis Chen]

Hi Ram, thank you very much for your response!