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  3. The warning message is: “The maximum contact stiffness is too big. This may affect the accuracy of the results.” Why does large contact stiffness affect results accuracy?

The warning message is: “The maximum contact stiffness is too big. This may affect the accuracy of the results.” Why does large contact stiffness affect results accuracy?

Tagged: 18.1, General, mechanical-apdl, structural-mechanics
    • June 5, 2023 at 7:04 am
      FAQFAQ
      Participant

      If the contact stiffness is too large, it can cause a very ill-conditioned matrix. Severely ill-conditioned matrices can lead to numerical roundoff error. (we have a finite span we can cover in double precision, and if the contact stiffness coefficients are too large than the other element’s stiffness coefficients, then error can accumulate from finite precision math when we try to invert [K] in the sparse direct solver or solve with an iterative solver to a certain level of tolerance).

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