Decomposition Singularity Tolerance - CAESAR II - Help

CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
12

Specifies the decomposition singularity tolerance for the eigensolver in scientific notation. The default value is 1E10.

During the decomposition of what may be a shifted stiffness matrix, the eigensolver performs a singularity check to make sure that the shift is not too close to an eigenvalue that is to be calculated. If a singular condition is detected, a new shift, not quite as aggressive as the last one, is calculated and a new decomposition is attempted. If the new composition fails, a fatal error is reported. Increasing the singularity tolerance may eliminate this fatal error, but do not enter a value greater than 1E13. Singularity problems may also exist when very light, small diameter piping is attached to very heavy, large diameter piping, or when very short lengths of pipe are adjacent to very long lengths of pipe.