| E5043
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WARNING: E5043
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THERE WERE
n EIGENVALUES NOT FOUND
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Cause:
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In BUCKLING and MODAL solutions using the subspace eigensolver, the final Sturm sequence check failed indicating that some eigenvalues may have been missed.
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Action:
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Change the following parameters on the
EIGRL Bulk Data entry one at a time in the order shown:
- Increase the number of additional iteration vectors.
- Increase the number of desired roots.
- Increase the number of additional iterations after convergence.
- Increase the number of additional converged iteration vectors.
- Decrease the convergence tolerance.
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Remarks:
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This error can occur when extracting rigid body modes where the roots are closely spaced. Rarely is one of the missed roots the lowest. Increasing the number of additional iteration vectors (default is 9) to 15 or 20 will usually correct the problem. Note that too large a value may decrease performance significantly, or result in a fatal
S1110 memory allocation error.
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