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Can you explain the following error message? Preconditioned conjugate gradient solver error level 1. Possibly, the model is unconstrained or additional iterations may be needed. Try running setting the multiplier MULT on the EQSLV command to greater than 1.0 (but less than 3.0).

- June 5, 2023 at 7:04 am
  
  FAQ
  Participant
  
  Two solutions can be tried : 1. Use the direct solver (SPARSE solver). However remember that for 1 million degrees of freedom (so roughly a 3D model with 300,000 nodes or a shell/beam model with 150,000 nodes), the sparse solver will need 10 Go of RAM while the PCG solver only needs 1Go. 2. Keep using the sparse solver but ask for more iterations (refer to the MULT option of the EQSLV command). That solution is the best option if the last iterations are near the convergence criterion of 1e-8. An APDL command snippet will have to be placed in the analysis (eg : eqslv,pcg,,5)

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