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Ansys Learning Forum › Forums › Discuss Simulation › General Mechanical › solver pilot error › Reply To: solver pilot error

October 7, 2024 at 1:53 pm
Deepak
Ansys Employee

Hi,

Solver pivot error to make you understand simply is the solution which has resulted in to singular matrix i.e., it may have many solutions (not unique) or is indeterminate.

There might be several reasons for this, 

Underdefined material - Like improper density, material properties, etc. (Maybe in this case)
Underdefined geometry (Maybe in this case)
Improper constraints - Over or under constraints 
Underdefined Contacts
Buckling (Maybe in this case) - Structure is deforming up to the extent of giving a non-unique solution.

How to deal with this issue -
Check and verify the above-mentioned points or if you're getting the apt result and post-processing is an issue, turn off the solver pivot from 'Solution' or Lapse the solver pivot checking using the command (PIVCHECK, OFF - PIVCHECK (ansys.com) )

References - 

5.9. Singular Matrices (ansys.com)
Search Ansys Documentation

A solver pivot warning or error has been detected (ansys.com)

Error: Solver pivot warnings or errors have been encountered during the solution (ansys.com)

 

Hope this helps!

Thanks,

Deepak.