Why can't we use the contact algorithm Lagrange method with the PCG solver?

Why can’t we use the contact algorithm Lagrange method with the PCG solver?

- June 5, 2023 at 7:04 am
  
  FAQ
  Participant
  
  The Lagrange method tends to produce zeros along the diagonal of the stiffness matrix. Our PCG solver would struggle with zeros along the diagonal and hence, the combination is blocked.

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Why can’t we use the contact algorithm Lagrange method with the PCG solver?

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