If you see Level 2, proceed with confidence but verify critical results. If you see Level 3 or 4, stop and remodel. And if you ever see Level 0 for a highly complex assembly—celebrate. You have achieved the holy grail of preconditioning.
The is an iterative numerical engine used to solve large systems of linear equations (
From the user’s perspective, you may notice: If you see Level 2, proceed with confidence
. This is a mathematical shortcut that helps the computer find the "answer" to your simulation faster without sacrificing the quality of the output. 4. What You Should Do If it runs smoothly:
The message "The PCG solver has automatically set the level of difficulty for this model to 2" means the software has realized the problem is harder than it looks. It is dynamically adjusting its internal parameters—likely switching to a more robust (but computationally expensive) preconditioner, such as an Incomplete LU (ILU) factorization, to ensure stability. You have achieved the holy grail of preconditioning
The system has detected that your model is moderately complex. Level 2 typically balances performance
Lowest memory usage; fastest for "clean" models with simple geometry and materials. Ill-conditioned to ensure stability.
In engineering terms:
is the software’s version of a "Yellow Alert." It indicates that the matrix is moderately ill-conditioned. The solver has analyzed the spectral properties of your matrix (specifically the eigenvalues and condition number) and determined that the standard default settings are insufficient.