CATIA V5-6R2018: Generative Structural Analysis
1–6 © 2020, ASCENT - Center for Technical Knowledge®
1.3 FEA Solution Refinement
The process of bringing the FEA approximation error to
acceptable levels is typically called solution refinement. There
are two alternative ways in which an FEA solution can be
refined.
The first option involves increasing the order of polynomials
within the finite elements, without changing the elements' sizes.
Consider the beam shown previously in Figure 1–3. If you use
second-degree polynomials to
approximate the deflection within each element, it results in a
more accurate solution without needing to make the finite
elements smaller, as shown in Figure 1–4.
Figure 1–4
CATIA GSA software has limited ability to work with the order of
polynomials within the finite elements; the only available options
are linear elements that use 1
st
degree polynomials and
parabolic elements that use 2
nd
degree polynomials.
The second option involves making the finite elements in the
mesh progressively smaller while maintaining the order of
polynomials within each element.
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