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Typical warning message from LUSAS Solver text output file (*.OUT):
***WARNING***
ELEMENT INITIAL CURVATURE IS TOO SEVERE
Elements must not be excessively curved.
A warning will be invoked (but the analysis will continue)
if the element curvature is not in accordance with the following
inequalities:
ABS ( S1 - S2 ) / ( S1 + S2 ) <= 0.05
( S1 + S2 ) / S3 <= 1.02
Where the function ABS returns the absolute value
of the arguments. The remedy is to model the curve
with more elements.
The reason for the presence of such a check in LUSAS
is related to both the evaluation of the Jacobian
matrix as well as the general issues of element
quality.
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